{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,17]],"date-time":"2025-12-17T17:54:26Z","timestamp":1765994066720,"version":"3.48.0"},"reference-count":64,"publisher":"Human Kinetics","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,1,1]]},"abstract":"<jats:p>\n                    <jats:italic>\n                      <jats:bold>Purpose:<\/jats:bold>\n                    <\/jats:italic>\n                    This study aimed to determine the reliability and relevance of key countermovement-jump parameters in academy soccer players.\n                    <jats:italic>\n                      <jats:bold>Methods:<\/jats:bold>\n                    <\/jats:italic>\n                    Twenty-nine bilateral countermovement jump force\u2013time variables were collected using dual force plates from 63 academy soccer players. Two analyses were performed: (1) test\u2013retest reliability was assessed in a convenience sample of 20 players across 2 sessions separated by 7\u00a0days, and (2) principal-component analysis was conducted in 47 players using their most representative seasonal trial to reduce data dimensionality.\n                    <jats:italic>\n                      <jats:bold>Results:<\/jats:bold>\n                    <\/jats:italic>\n                    Most outcome-based variables demonstrated acceptable reliability (intraclass correlation coefficient [ICC]\u2009\u2265\u2009.81, coefficient of variation [CV]\u2009\u2264\u200913.7%). Nine out of 11 time-based variables showed acceptable reliability (ICC\u2009\u2265\u2009.67, CV\u2009\u2264\u200912.9%). All asymmetry-based variables showed unacceptable reliability (ICC\u2009\u2265\u2009.11, CV\u2009\u2264\u200966.4%), while symmetry-based variables generally displayed excellent reliability (ICC\u2009\u2265\u2009.90, CV\u2009\u2264\u200911.8%). The principal-component analysis revealed 3 principal components within outcome (force and power production during concentric and eccentric phases)\u00a0and time-based (temporal ratios, concentric duration, and landing characteristics) variables, whereas 2 principal components were revealed for asymmetry- or symmetry-based variables (related to eccentric, concentric, and landing phases). These explained 83.1%, 76.1%, and 81.9% of the total variance for outcome-, time-, and asymmetry- or symmetry-based variables, respectively.\n                    <jats:italic>\n                      <jats:bold>Conclusions:<\/jats:bold>\n                    <\/jats:italic>\n                    Practitioners involved with bilateral countermovement jump testing in academy soccer players can rely on the selected parameters presented in our study. Symmetry parameters could be preferred over asymmetry parameters, due to their superior reliability.\n                  <\/jats:p>","DOI":"10.1123\/ijspp.2025-0320","type":"journal-article","created":{"date-parts":[[2025,11,17]],"date-time":"2025-11-17T18:52:46Z","timestamp":1763405566000},"page":"106-117","source":"Crossref","is-referenced-by-count":0,"title":["Identifying Relevant Countermovement-Jump Parameters for Academy Soccer Players"],"prefix":"10.1123","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-2471-6585","authenticated-orcid":true,"given":"Carlos","family":"Suarez-Balsera","sequence":"first","affiliation":[{"name":"UCAM Research Center for High Performance Sport, Catholic University of Murcia, Murcia, Spain"},{"name":"Sein\u00e4joen Jalkapallokerho (SJK), Sein\u00e4joki, Finland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5515-3694","authenticated-orcid":true,"given":"Pedro","family":"Figueiredo","sequence":"additional","affiliation":[{"name":"Physical Education Department, College of Education, United Arab Emirates University, Al Ain, United Arab Emirates"},{"name":"Research Center in Sports Sciences, Health Sciences and Human Development, CIDESD, Maia, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1251-8785","authenticated-orcid":true,"given":"Chris","family":"Bishop","sequence":"additional","affiliation":[{"name":"London Sport Institute, Middlesex University, London, United Kingdom"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9445-4008","authenticated-orcid":true,"given":"Vincenzo","family":"Rago","sequence":"additional","affiliation":[{"name":"National Youth Sports Institute, Singapore, Singapore"},{"name":"Department of Theoretical and Applied Sciences, eCampus University, Novedrate, Italy"}]}],"member":"100","reference":[{"issue":"7","key":"r1","series-title":"J Strength Cond Res","doi-asserted-by":"publisher","first-page":"2006","DOI":"10.1519\/JSC.0000000000002446","article-title":"Importance of strength and power on key performance indicators in elite youth soccer","volume":"34","author":"Wing CE","year":"2020","unstructured":"Wing CE, Turner AN, Bishop CJ. Importance of strength and power on key performance indicators in elite youth soccer. J Strength Cond Res. 2020;34(7):2006\u20132014. doi:10.1519\/JSC.0000000000002446"},{"key":"r2","series-title":"Front Physiol","doi-asserted-by":"publisher","DOI":"10.3389\/fphys.2019.01384","article-title":"A review of countermovement and squat jump testing methods in the context of public health examination in adolescence: reliability and feasibility of current testing procedures","volume":"10","author":"Petrigna L","year":"2019","unstructured":"Petrigna L, Karsten B, Marcolin G, et\u00a0al. A review of countermovement and squat jump testing methods in the context of public health examination in adolescence: reliability and feasibility of current testing procedures. Front Physiol. 2019;10:1384. doi:10.3389\/fphys.2019.01384"},{"issue":"1","key":"r3","series-title":"Sci Sports","doi-asserted-by":"publisher","first-page":"e1","DOI":"10.1016\/j.scispo.2013.04.006","article-title":"The relationship between sprint ability, agility and vertical jump performance in young soccer players","volume":"30","author":"K\u00f6kl\u00fc Y","year":"2015","unstructured":"K\u00f6kl\u00fc Y, Alemdaro\u011flu U, \u00d6zkan A, Koz M, Ers\u00f6z G. The relationship between sprint ability, agility and vertical jump performance in young soccer players. Sci Sports. 2015;30(1):e1\u2013e5. doi:10.1016\/j.scispo.2013.04.006"},{"issue":"1","key":"r4","series-title":"Sports","doi-asserted-by":"publisher","DOI":"10.3390\/sports4010011","article-title":"Relationship of two vertical jumping tests to sprint and change of direction speed among male and female collegiate soccer players","volume":"4","author":"McFarland IT","year":"2016","unstructured":"McFarland IT, Dawes JJ, Elder CL, Lockie RG. Relationship of two vertical jumping tests to sprint and change of direction speed among male and female collegiate soccer players. Sports. 2016;4(1):11. doi:10.3390\/sports4010011"},{"issue":"4","key":"r5","series-title":"Strength Cond J","doi-asserted-by":"publisher","DOI":"10.1519\/SSC.0000000000000677","article-title":"A framework to guide practitioners for selecting metrics during the countermovement and drop jump tests","volume":"44","author":"Bishop C","year":"2022","unstructured":"Bishop C, Turner A, Jordan M, et\u00a0al. A framework to guide practitioners for selecting metrics during the countermovement and drop jump tests. Strength Cond J. 2022;44(4):677. doi:10.1519\/SSC.0000000000000677"},{"issue":"5","key":"r6","series-title":"Strength Cond J","doi-asserted-by":"publisher","DOI":"10.1519\/SSC.0000000000000772","article-title":"Selecting metrics that matter: comparing the use of the countermovement jump for performance profiling, neuromuscular fatigue monitoring, and injury rehabilitation testing","volume":"45","author":"Bishop C","year":"2023","unstructured":"Bishop C, Jordan M, Torres-Ronda L, et\u00a0al. Selecting metrics that matter: comparing the use of the countermovement jump for performance profiling, neuromuscular fatigue monitoring, and injury rehabilitation testing. Strength Cond J. 2023;45(5):772. doi:10.1519\/SSC.0000000000000772"},{"key":"r7","series-title":"Front Sports Act Living","doi-asserted-by":"publisher","DOI":"10.3389\/fspor.2023.1173621","article-title":"Reliability and sensitivity to change of post-match physical performance measures in elite youth soccer players","volume":"5","author":"Franceschi A","year":"2023","unstructured":"Franceschi A, Robinson MA, Owens D, Brownlee T, Ferrari Bravo D, Enright K. Reliability and sensitivity to change of post-match physical performance measures in elite youth soccer players. Front Sports Act Living. 2023;5:1173621. doi:10.3389\/fspor.2023.1173621"},{"issue":"1","key":"r8","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","first-page":"84","DOI":"10.1123\/ijspp.2013-0413","article-title":"Alternative countermovement-jump analysis to quantify acute neuromuscular fatigue","volume":"10","author":"Gathercole R","year":"2015","unstructured":"Gathercole R, Sporer B, Stellingwerff T, Sleivert G. Alternative countermovement-jump analysis to quantify acute neuromuscular fatigue. Int J Sports Physiol Perform. 2015;10(1):84\u201392. doi:10.1123\/ijspp.2013-0413"},{"issue":"4","key":"r9","series-title":"J Sci Med Sport","doi-asserted-by":"publisher","first-page":"397","DOI":"10.1016\/j.jsams.2016.08.011","article-title":"The countermovement jump to monitor neuromuscular status: a meta-analysis","volume":"20","author":"Claudino JG","year":"2017","unstructured":"Claudino JG, Cronin J, Mez\u00eancio B, et\u00a0al. The countermovement jump to monitor neuromuscular status: a meta-analysis. J Sci Med Sport. 2017;20(4):397\u2013402. doi:10.1016\/j.jsams.2016.08.011"},{"issue":"5","key":"r10","series-title":"Trans Sports Med","doi-asserted-by":"publisher","first-page":"256","DOI":"10.1002\/tsm2.92","article-title":"Previous injury is associated with heightened countermovement jump force-time asymmetries in professional soccer players","volume":"2","author":"Hart LM","year":"2019","unstructured":"Hart LM, Cohen DD, Patterson SD, Springham M, Reynolds J, Read P. Previous injury is associated with heightened countermovement jump force-time asymmetries in professional soccer players. Trans Sports Med. 2019;2(5):256\u2013262. doi:10.1002\/tsm2.92"},{"issue":"12","key":"r11","series-title":"J Strength Cond Res","doi-asserted-by":"publisher","first-page":"3448","DOI":"10.1519\/JSC.0000000000003317","article-title":"The reliability of potential fatigue-monitoring measures in elite youth soccer players","volume":"35","author":"Fitzpatrick JF","year":"2021","unstructured":"Fitzpatrick JF, Hicks KM, Russell M, Hayes PR. The reliability of potential fatigue-monitoring measures in elite youth soccer players. J Strength Cond Res. 2021;35(12):3448\u20133452. doi:10.1519\/JSC.0000000000003317"},{"issue":"12","key":"r12","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","first-page":"1444","DOI":"10.1123\/ijspp.2023-0473","article-title":"Countermovement jump and isometric strength test-retest reliability in English premier league academy football players","volume":"19","author":"Springham M","year":"2024","unstructured":"Springham M, Singh N, Stewart P, et\u00a0al. Countermovement jump and isometric strength test-retest reliability in English premier league academy football players. Int J Sports Physiol Perform. 2024;19(12):1444\u20131454. doi:10.1123\/ijspp.2023-0473"},{"issue":"7","key":"r13","series-title":"PLoS One","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0255458","article-title":"Between-session reliability of performance and asymmetry variables obtained during unilateral and bilateral countermovement jumps in basketball players","volume":"16","author":"P\u00e9rez-Castilla A","year":"2021","unstructured":"P\u00e9rez-Castilla A, Garc\u00eda-Ramos A, Janicijevic D, et\u00a0al. Between-session reliability of performance and asymmetry variables obtained during unilateral and bilateral countermovement jumps in basketball players. PLoS One. 2021;16(7):e0255458. doi:10.1371\/journal.pone.0255458"},{"key":"r14","series-title":"J Sci Sport Exerc","doi-asserted-by":"publisher","DOI":"10.1007\/s42978-023-00239-8","article-title":"Tracking the reliability of force plate-derived countermovement jump metrics over time in female basketball athletes: a comparison of principal component analysis vs. conventional methods","volume":"10","author":"Keogh JAJ","year":"2023","unstructured":"Keogh JAJ, Bishop C, Ruder MC, Kobsar D. Tracking the reliability of force plate-derived countermovement jump metrics over time in female basketball athletes: a comparison of principal component analysis vs. conventional methods. J Sci Sport Exerc. 2023;10:239. doi:10.1007\/s42978-023-00239-8"},{"issue":"7","key":"r15","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","first-page":"1052","DOI":"10.1123\/ijspp.2020-0606","article-title":"Dimensionality reduction for countermovement jump metrics","volume":"16","author":"James LP","year":"2021","unstructured":"James LP, Suppiah H, McGuigan MR, Carey DL. Dimensionality reduction for countermovement jump metrics. Int J Sports Physiol Perform. 2021;16(7):1052\u20131055. doi:10.1123\/ijspp.2020-0606"},{"issue":"7","key":"r16","series-title":"PLoS One","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0219295","article-title":"Predicting fatigue using countermovement jump force-time signatures: PCA can distinguish neuromuscular versus metabolic fatigue","volume":"14","author":"Wu PP","year":"2019","unstructured":"Wu PP, Sterkenburg N, Everett K, Chapman DW, White N, Mengersen K. Predicting fatigue using countermovement jump force-time signatures: PCA can distinguish neuromuscular versus metabolic fatigue. PLoS One. 2019;14(7):e0219295. doi:10.1371\/journal.pone.0219295"},{"issue":"2","key":"r17","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","first-page":"317","DOI":"10.1123\/ijspp.2021-0451","article-title":"Defining training and performance caliber: a participant classification framework","volume":"17","author":"McKay AKA","year":"2022","unstructured":"McKay AKA, Stellingwerff T, Smith ES, et\u00a0al. Defining training and performance caliber: a participant classification framework. Int J Sports Physiol Perform. 2022;17(2):317\u2013331. doi:10.1123\/ijspp.2021-0451"},{"key":"r18","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","DOI":"10.1123\/ijspp.2024-0203","article-title":"Isometric midthigh-pull testing: reliability and correlation with key functional capacities in young soccer players","volume":"10","author":"Rago V","year":"2024","unstructured":"Rago V, Nakamura FY, Suarez-Balsera C, Arnaiz-Lastras J, Figueiredo P. Isometric midthigh-pull testing: reliability and correlation with key functional capacities in young soccer players. Int J Sports Physiol Perform. 2024;10:203. doi:10.1123\/ijspp.2024-0203"},{"issue":"1","key":"r19","series-title":"Sports Med","doi-asserted-by":"publisher","first-page":"1","DOI":"10.2165\/00007256-200030010-00001","article-title":"Measures of reliability in sports medicine and science","volume":"30","author":"Hopkins WG","year":"2000","unstructured":"Hopkins WG. Measures of reliability in sports medicine and science. Sports Med. 2000;30(1):1\u201315. doi:10.2165\/00007256-200030010-00001"},{"issue":"4","key":"r20","series-title":"Strength Cond J","doi-asserted-by":"publisher","DOI":"10.1519\/SSC.0000000000000371","article-title":"Interlimb asymmetries: understanding how to calculate differences from bilateral and unilateral tests","volume":"40","author":"Bishop C","year":"2018","unstructured":"Bishop C, Read P, Lake J, Chavda S, Turner A. Interlimb asymmetries: understanding how to calculate differences from bilateral and unilateral tests. Strength Cond J. 2018;40(4):371. doi:10.1519\/SSC.0000000000000371"},{"key":"r21","series-title":"Sportscience","first-page":"36","article-title":"Spreadsheets for analysis of validity and reliability","volume":"21","author":"Hopkins WG","year":"2017","unstructured":"Hopkins WG. Spreadsheets for analysis of validity and reliability. Sportscience. 2017;21:36\u201342."},{"issue":"2","key":"r22","series-title":"J Chiropr Med","doi-asserted-by":"publisher","first-page":"155","DOI":"10.1016\/j.jcm.2016.02.012","article-title":"A guideline of selecting and reporting intraclass correlation coefficients for reliability research","volume":"15","author":"Koo TK","year":"2016","unstructured":"Koo TK, Li MY. A guideline of selecting and reporting intraclass correlation coefficients for reliability research. J Chiropr Med. 2016;15(2):155\u2013163. doi:10.1016\/j.jcm.2016.02.012"},{"key":"r23","series-title":"Methods of Clinical Epidemiology","first-page":"39","article-title":"The coefficient of variation as an index of measurement reliability","author":"Shechtman O","year":"2013","unstructured":"Shechtman O.The coefficient of variation as an index of measurement reliability. In: Doi SAR, Williams GM, eds. Methods of Clinical Epidemiology. Springer Berlin Heidelberg; 2013:39\u201349."},{"issue":"1","key":"r24","series-title":"J Strength Cond Res","doi-asserted-by":"publisher","first-page":"231","DOI":"10.1519\/15184.1","article-title":"Quantifying test-retest reliability using the intraclass correlation coefficient and the SEM","volume":"19","author":"Weir JP","year":"2005","unstructured":"Weir JP. Quantifying test-retest reliability using the intraclass correlation coefficient and the SEM. J Strength Cond Res. 2005;19(1):231\u2013240. doi:10.1519\/15184.1"},{"issue":"1","key":"r25","series-title":"Med Sci Sports Exerc","doi-asserted-by":"publisher","first-page":"3","DOI":"10.1249\/MSS.0b013e31818cb278","article-title":"Progressive statistics for studies in sports medicine and exercise science","volume":"41","author":"Hopkins WG","year":"2009","unstructured":"Hopkins WG, Marshall SW, Batterham AM, Hanin J. Progressive statistics for studies in sports medicine and exercise science. Med Sci Sports Exerc. 2009;41(1):3\u201312. doi:10.1249\/MSS.0b013e31818cb278"},{"issue":"2","key":"r26","series-title":"J Strength Cond Res","doi-asserted-by":"publisher","first-page":"546","DOI":"10.1519\/JSC.0000000000002812","article-title":"Countermovement jump reliability performed with and without an arm swing in NCAA division 1 intercollegiate basketball players","volume":"34","author":"Heishman AD","year":"2020","unstructured":"Heishman AD, Daub BD, Miller RM, Freitas EDS, Frantz BA, Bemben MG. Countermovement jump reliability performed with and without an arm swing in NCAA division 1 intercollegiate basketball players. J Strength Cond Res. 2020;34(2):546\u2013558. doi:10.1519\/JSC.0000000000002812"},{"issue":"2","key":"r27","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","first-page":"131","DOI":"10.1123\/ijspp.3.2.131","article-title":"Reliability of measures obtained during single and repeated countermovement jumps","volume":"3","author":"Cormack SJ","year":"2008","unstructured":"Cormack SJ, Newton RU, McGuigan MR, Doyle TL. Reliability of measures obtained during single and repeated countermovement jumps. Int J Sports Physiol Perform. 2008;3(2):131\u2013144. doi:10.1123\/ijspp.3.2.131"},{"issue":"2","key":"r28","series-title":"J Strength Cond Res","doi-asserted-by":"publisher","first-page":"379","DOI":"10.1519\/JSC.0b013e3181be305c","article-title":"The role of rate of force development on vertical jump performance","volume":"25","author":"McLellan CP","year":"2011","unstructured":"McLellan CP, Lovell DI, Gass GC. The role of rate of force development on vertical jump performance. J Strength Cond Res. 2011;25(2):379\u2013385. doi:10.1519\/JSC.0b013e3181be305c"},{"issue":"6","key":"r29","series-title":"Eur J Appl Physiol","doi-asserted-by":"publisher","first-page":"1091","DOI":"10.1007\/s00421-016-3346-6","article-title":"Rate of force development: physiological and methodological considerations","volume":"116","author":"Maffiuletti NA","year":"2016","unstructured":"Maffiuletti NA, Aagaard P, Blazevich AJ, Folland J, Tillin N, Duchateau J. Rate of force development: physiological and methodological considerations. Eur J Appl Physiol. 2016;116(6):1091\u20131116. doi:10.1007\/s00421-016-3346-6"},{"issue":"10","key":"r30","series-title":"Symmetry","doi-asserted-by":"publisher","DOI":"10.3390\/sym15101960","article-title":"Test\u2013retest reliability of the magnitude and direction of asymmetry in the countermovement jump, drop jump, and countermovement rebound jump","volume":"15","author":"Xu J","year":"2023","unstructured":"Xu J, Jordan MJ, Chavda S, Turner A, Bishop C. Test\u2013retest reliability of the magnitude and direction of asymmetry in the countermovement jump, drop jump, and countermovement rebound jump. Symmetry. 2023;15(10):960. doi:10.3390\/sym15101960"},{"issue":"6","key":"r31","series-title":"J Strength Cond Res","doi-asserted-by":"publisher","first-page":"1660","DOI":"10.1519\/JSC.0000000000003679","article-title":"Bilateral vs. unilateral countermovement jumps: comparing the magnitude and direction of asymmetry in elite academy soccer players","volume":"36","author":"Bishop C","year":"2022","unstructured":"Bishop C, Abbott W, Brashill C, Turner A, Lake J, Read P. Bilateral vs. unilateral countermovement jumps: comparing the magnitude and direction of asymmetry in elite academy soccer players. J Strength Cond Res. 2022;36(6):1660\u20131666. doi:10.1519\/JSC.0000000000003679"},{"issue":"4","key":"r32","series-title":"J Sports Sci","doi-asserted-by":"publisher","first-page":"370","DOI":"10.1080\/02640414.2018.1504602","article-title":"Application of the principal component waveform analysis to identify improvements in vertical jump performance","volume":"37","author":"Flor\u00eda P","year":"2019","unstructured":"Flor\u00eda P, S\u00e1nchez-Sixto A, Harrison AJ. Application of the principal component waveform analysis to identify improvements in vertical jump performance. J Sports Sci. 2019;37(4):370\u2013377. doi:10.1080\/02640414.2018.1504602"},{"issue":"7","key":"r1","series-title":"J Strength Cond Res","doi-asserted-by":"publisher","first-page":"2006","DOI":"10.1519\/JSC.0000000000002446","article-title":"Importance of strength and power on key performance indicators in elite youth soccer","volume":"34","author":"Wing CE","year":"2020","unstructured":"Wing CE, Turner AN, Bishop CJ. Importance of strength and power on key performance indicators in elite youth soccer. J Strength Cond Res. 2020;34(7):2006\u20132014. doi:10.1519\/JSC.0000000000002446"},{"key":"r2","series-title":"Front Physiol","doi-asserted-by":"publisher","DOI":"10.3389\/fphys.2019.01384","article-title":"A review of countermovement and squat jump testing methods in the context of public health examination in adolescence: reliability and feasibility of current testing procedures","volume":"10","author":"Petrigna L","year":"2019","unstructured":"Petrigna L, Karsten B, Marcolin G, et\u00a0al. A review of countermovement and squat jump testing methods in the context of public health examination in adolescence: reliability and feasibility of current testing procedures. Front Physiol. 2019;10:1384. doi:10.3389\/fphys.2019.01384"},{"issue":"1","key":"r3","series-title":"Sci Sports","doi-asserted-by":"publisher","first-page":"e1","DOI":"10.1016\/j.scispo.2013.04.006","article-title":"The relationship between sprint ability, agility and vertical jump performance in young soccer players","volume":"30","author":"K\u00f6kl\u00fc Y","year":"2015","unstructured":"K\u00f6kl\u00fc Y, Alemdaro\u011flu U, \u00d6zkan A, Koz M, Ers\u00f6z G. The relationship between sprint ability, agility and vertical jump performance in young soccer players. Sci Sports. 2015;30(1):e1\u2013e5. doi:10.1016\/j.scispo.2013.04.006"},{"issue":"1","key":"r4","series-title":"Sports","doi-asserted-by":"publisher","DOI":"10.3390\/sports4010011","article-title":"Relationship of two vertical jumping tests to sprint and change of direction speed among male and female collegiate soccer players","volume":"4","author":"McFarland IT","year":"2016","unstructured":"McFarland IT, Dawes JJ, Elder CL, Lockie RG. Relationship of two vertical jumping tests to sprint and change of direction speed among male and female collegiate soccer players. Sports. 2016;4(1):11. doi:10.3390\/sports4010011"},{"issue":"4","key":"r5","series-title":"Strength Cond J","doi-asserted-by":"publisher","DOI":"10.1519\/SSC.0000000000000677","article-title":"A framework to guide practitioners for selecting metrics during the countermovement and drop jump tests","volume":"44","author":"Bishop C","year":"2022","unstructured":"Bishop C, Turner A, Jordan M, et\u00a0al. A framework to guide practitioners for selecting metrics during the countermovement and drop jump tests. Strength Cond J. 2022;44(4):677. doi:10.1519\/SSC.0000000000000677"},{"issue":"5","key":"r6","series-title":"Strength Cond J","doi-asserted-by":"publisher","DOI":"10.1519\/SSC.0000000000000772","article-title":"Selecting metrics that matter: comparing the use of the countermovement jump for performance profiling, neuromuscular fatigue monitoring, and injury rehabilitation testing","volume":"45","author":"Bishop C","year":"2023","unstructured":"Bishop C, Jordan M, Torres-Ronda L, et\u00a0al. Selecting metrics that matter: comparing the use of the countermovement jump for performance profiling, neuromuscular fatigue monitoring, and injury rehabilitation testing. Strength Cond J. 2023;45(5):772. doi:10.1519\/SSC.0000000000000772"},{"key":"r7","series-title":"Front Sports Act Living","doi-asserted-by":"publisher","DOI":"10.3389\/fspor.2023.1173621","article-title":"Reliability and sensitivity to change of post-match physical performance measures in elite youth soccer players","volume":"5","author":"Franceschi A","year":"2023","unstructured":"Franceschi A, Robinson MA, Owens D, Brownlee T, Ferrari Bravo D, Enright K. Reliability and sensitivity to change of post-match physical performance measures in elite youth soccer players. Front Sports Act Living. 2023;5:1173621. doi:10.3389\/fspor.2023.1173621"},{"issue":"1","key":"r8","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","first-page":"84","DOI":"10.1123\/ijspp.2013-0413","article-title":"Alternative countermovement-jump analysis to quantify acute neuromuscular fatigue","volume":"10","author":"Gathercole R","year":"2015","unstructured":"Gathercole R, Sporer B, Stellingwerff T, Sleivert G. Alternative countermovement-jump analysis to quantify acute neuromuscular fatigue. Int J Sports Physiol Perform. 2015;10(1):84\u201392. doi:10.1123\/ijspp.2013-0413"},{"issue":"4","key":"r9","series-title":"J Sci Med Sport","doi-asserted-by":"publisher","first-page":"397","DOI":"10.1016\/j.jsams.2016.08.011","article-title":"The countermovement jump to monitor neuromuscular status: a meta-analysis","volume":"20","author":"Claudino JG","year":"2017","unstructured":"Claudino JG, Cronin J, Mez\u00eancio B, et\u00a0al. The countermovement jump to monitor neuromuscular status: a meta-analysis. J Sci Med Sport. 2017;20(4):397\u2013402. doi:10.1016\/j.jsams.2016.08.011"},{"issue":"5","key":"r10","series-title":"Trans Sports Med","doi-asserted-by":"publisher","first-page":"256","DOI":"10.1002\/tsm2.92","article-title":"Previous injury is associated with heightened countermovement jump force-time asymmetries in professional soccer players","volume":"2","author":"Hart LM","year":"2019","unstructured":"Hart LM, Cohen DD, Patterson SD, Springham M, Reynolds J, Read P. Previous injury is associated with heightened countermovement jump force-time asymmetries in professional soccer players. Trans Sports Med. 2019;2(5):256\u2013262. doi:10.1002\/tsm2.92"},{"issue":"12","key":"r11","series-title":"J Strength Cond Res","doi-asserted-by":"publisher","first-page":"3448","DOI":"10.1519\/JSC.0000000000003317","article-title":"The reliability of potential fatigue-monitoring measures in elite youth soccer players","volume":"35","author":"Fitzpatrick JF","year":"2021","unstructured":"Fitzpatrick JF, Hicks KM, Russell M, Hayes PR. The reliability of potential fatigue-monitoring measures in elite youth soccer players. J Strength Cond Res. 2021;35(12):3448\u20133452. doi:10.1519\/JSC.0000000000003317"},{"issue":"12","key":"r12","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","first-page":"1444","DOI":"10.1123\/ijspp.2023-0473","article-title":"Countermovement jump and isometric strength test-retest reliability in English premier league academy football players","volume":"19","author":"Springham M","year":"2024","unstructured":"Springham M, Singh N, Stewart P, et\u00a0al. Countermovement jump and isometric strength test-retest reliability in English premier league academy football players. Int J Sports Physiol Perform. 2024;19(12):1444\u20131454. doi:10.1123\/ijspp.2023-0473"},{"issue":"7","key":"r13","series-title":"PLoS One","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0255458","article-title":"Between-session reliability of performance and asymmetry variables obtained during unilateral and bilateral countermovement jumps in basketball players","volume":"16","author":"P\u00e9rez-Castilla A","year":"2021","unstructured":"P\u00e9rez-Castilla A, Garc\u00eda-Ramos A, Janicijevic D, et\u00a0al. Between-session reliability of performance and asymmetry variables obtained during unilateral and bilateral countermovement jumps in basketball players. PLoS One. 2021;16(7):e0255458. doi:10.1371\/journal.pone.0255458"},{"key":"r14","series-title":"J Sci Sport Exerc","doi-asserted-by":"publisher","DOI":"10.1007\/s42978-023-00239-8","article-title":"Tracking the reliability of force plate-derived countermovement jump metrics over time in female basketball athletes: a comparison of principal component analysis vs. conventional methods","volume":"10","author":"Keogh JAJ","year":"2023","unstructured":"Keogh JAJ, Bishop C, Ruder MC, Kobsar D. Tracking the reliability of force plate-derived countermovement jump metrics over time in female basketball athletes: a comparison of principal component analysis vs. conventional methods. J Sci Sport Exerc. 2023;10:239. doi:10.1007\/s42978-023-00239-8"},{"issue":"7","key":"r15","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","first-page":"1052","DOI":"10.1123\/ijspp.2020-0606","article-title":"Dimensionality reduction for countermovement jump metrics","volume":"16","author":"James LP","year":"2021","unstructured":"James LP, Suppiah H, McGuigan MR, Carey DL. Dimensionality reduction for countermovement jump metrics. Int J Sports Physiol Perform. 2021;16(7):1052\u20131055. doi:10.1123\/ijspp.2020-0606"},{"issue":"7","key":"r16","series-title":"PLoS One","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0219295","article-title":"Predicting fatigue using countermovement jump force-time signatures: PCA can distinguish neuromuscular versus metabolic fatigue","volume":"14","author":"Wu PP","year":"2019","unstructured":"Wu PP, Sterkenburg N, Everett K, Chapman DW, White N, Mengersen K. Predicting fatigue using countermovement jump force-time signatures: PCA can distinguish neuromuscular versus metabolic fatigue. PLoS One. 2019;14(7):e0219295. doi:10.1371\/journal.pone.0219295"},{"issue":"2","key":"r17","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","first-page":"317","DOI":"10.1123\/ijspp.2021-0451","article-title":"Defining training and performance caliber: a participant classification framework","volume":"17","author":"McKay AKA","year":"2022","unstructured":"McKay AKA, Stellingwerff T, Smith ES, et\u00a0al. Defining training and performance caliber: a participant classification framework. Int J Sports Physiol Perform. 2022;17(2):317\u2013331. doi:10.1123\/ijspp.2021-0451"},{"key":"r18","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","DOI":"10.1123\/ijspp.2024-0203","article-title":"Isometric midthigh-pull testing: reliability and correlation with key functional capacities in young soccer players","volume":"10","author":"Rago V","year":"2024","unstructured":"Rago V, Nakamura FY, Suarez-Balsera C, Arnaiz-Lastras J, Figueiredo P. Isometric midthigh-pull testing: reliability and correlation with key functional capacities in young soccer players. Int J Sports Physiol Perform. 2024;10:203. doi:10.1123\/ijspp.2024-0203"},{"issue":"1","key":"r19","series-title":"Sports Med","doi-asserted-by":"publisher","first-page":"1","DOI":"10.2165\/00007256-200030010-00001","article-title":"Measures of reliability in sports medicine and science","volume":"30","author":"Hopkins WG","year":"2000","unstructured":"Hopkins WG. Measures of reliability in sports medicine and science. Sports Med. 2000;30(1):1\u201315. doi:10.2165\/00007256-200030010-00001"},{"issue":"4","key":"r20","series-title":"Strength Cond J","doi-asserted-by":"publisher","DOI":"10.1519\/SSC.0000000000000371","article-title":"Interlimb asymmetries: understanding how to calculate differences from bilateral and unilateral tests","volume":"40","author":"Bishop C","year":"2018","unstructured":"Bishop C, Read P, Lake J, Chavda S, Turner A. Interlimb asymmetries: understanding how to calculate differences from bilateral and unilateral tests. Strength Cond J. 2018;40(4):371. doi:10.1519\/SSC.0000000000000371"},{"key":"r21","series-title":"Sportscience","first-page":"36","article-title":"Spreadsheets for analysis of validity and reliability","volume":"21","author":"Hopkins WG","year":"2017","unstructured":"Hopkins WG. Spreadsheets for analysis of validity and reliability. Sportscience. 2017;21:36\u201342."},{"issue":"2","key":"r22","series-title":"J Chiropr Med","doi-asserted-by":"publisher","first-page":"155","DOI":"10.1016\/j.jcm.2016.02.012","article-title":"A guideline of selecting and reporting intraclass correlation coefficients for reliability research","volume":"15","author":"Koo TK","year":"2016","unstructured":"Koo TK, Li MY. A guideline of selecting and reporting intraclass correlation coefficients for reliability research. J Chiropr Med. 2016;15(2):155\u2013163. doi:10.1016\/j.jcm.2016.02.012"},{"key":"r23","series-title":"Methods of Clinical Epidemiology","first-page":"39","article-title":"The coefficient of variation as an index of measurement reliability","author":"Shechtman O","year":"2013","unstructured":"Shechtman O.The coefficient of variation as an index of measurement reliability. In: Doi SAR, Williams GM, eds. Methods of Clinical Epidemiology. Springer Berlin Heidelberg; 2013:39\u201349."},{"issue":"1","key":"r24","series-title":"J Strength Cond Res","doi-asserted-by":"publisher","first-page":"231","DOI":"10.1519\/15184.1","article-title":"Quantifying test-retest reliability using the intraclass correlation coefficient and the SEM","volume":"19","author":"Weir JP","year":"2005","unstructured":"Weir JP. Quantifying test-retest reliability using the intraclass correlation coefficient and the SEM. J Strength Cond Res. 2005;19(1):231\u2013240. doi:10.1519\/15184.1"},{"issue":"1","key":"r25","series-title":"Med Sci Sports Exerc","doi-asserted-by":"publisher","first-page":"3","DOI":"10.1249\/MSS.0b013e31818cb278","article-title":"Progressive statistics for studies in sports medicine and exercise science","volume":"41","author":"Hopkins WG","year":"2009","unstructured":"Hopkins WG, Marshall SW, Batterham AM, Hanin J. Progressive statistics for studies in sports medicine and exercise science. Med Sci Sports Exerc. 2009;41(1):3\u201312. doi:10.1249\/MSS.0b013e31818cb278"},{"issue":"2","key":"r26","series-title":"J Strength Cond Res","doi-asserted-by":"publisher","first-page":"546","DOI":"10.1519\/JSC.0000000000002812","article-title":"Countermovement jump reliability performed with and without an arm swing in NCAA division 1 intercollegiate basketball players","volume":"34","author":"Heishman AD","year":"2020","unstructured":"Heishman AD, Daub BD, Miller RM, Freitas EDS, Frantz BA, Bemben MG. Countermovement jump reliability performed with and without an arm swing in NCAA division 1 intercollegiate basketball players. J Strength Cond Res. 2020;34(2):546\u2013558. doi:10.1519\/JSC.0000000000002812"},{"issue":"2","key":"r27","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","first-page":"131","DOI":"10.1123\/ijspp.3.2.131","article-title":"Reliability of measures obtained during single and repeated countermovement jumps","volume":"3","author":"Cormack SJ","year":"2008","unstructured":"Cormack SJ, Newton RU, McGuigan MR, Doyle TL. Reliability of measures obtained during single and repeated countermovement jumps. Int J Sports Physiol Perform. 2008;3(2):131\u2013144. doi:10.1123\/ijspp.3.2.131"},{"issue":"2","key":"r28","series-title":"J Strength Cond Res","doi-asserted-by":"publisher","first-page":"379","DOI":"10.1519\/JSC.0b013e3181be305c","article-title":"The role of rate of force development on vertical jump performance","volume":"25","author":"McLellan CP","year":"2011","unstructured":"McLellan CP, Lovell DI, Gass GC. The role of rate of force development on vertical jump performance. J Strength Cond Res. 2011;25(2):379\u2013385. doi:10.1519\/JSC.0b013e3181be305c"},{"issue":"6","key":"r29","series-title":"Eur J Appl Physiol","doi-asserted-by":"publisher","first-page":"1091","DOI":"10.1007\/s00421-016-3346-6","article-title":"Rate of force development: physiological and methodological considerations","volume":"116","author":"Maffiuletti NA","year":"2016","unstructured":"Maffiuletti NA, Aagaard P, Blazevich AJ, Folland J, Tillin N, Duchateau J. Rate of force development: physiological and methodological considerations. Eur J Appl Physiol. 2016;116(6):1091\u20131116. doi:10.1007\/s00421-016-3346-6"},{"issue":"10","key":"r30","series-title":"Symmetry","doi-asserted-by":"publisher","DOI":"10.3390\/sym15101960","article-title":"Test\u2013retest reliability of the magnitude and direction of asymmetry in the countermovement jump, drop jump, and countermovement rebound jump","volume":"15","author":"Xu J","year":"2023","unstructured":"Xu J, Jordan MJ, Chavda S, Turner A, Bishop C. Test\u2013retest reliability of the magnitude and direction of asymmetry in the countermovement jump, drop jump, and countermovement rebound jump. Symmetry. 2023;15(10):960. doi:10.3390\/sym15101960"},{"issue":"6","key":"r31","series-title":"J Strength Cond Res","doi-asserted-by":"publisher","first-page":"1660","DOI":"10.1519\/JSC.0000000000003679","article-title":"Bilateral vs. unilateral countermovement jumps: comparing the magnitude and direction of asymmetry in elite academy soccer players","volume":"36","author":"Bishop C","year":"2022","unstructured":"Bishop C, Abbott W, Brashill C, Turner A, Lake J, Read P. Bilateral vs. unilateral countermovement jumps: comparing the magnitude and direction of asymmetry in elite academy soccer players. J Strength Cond Res. 2022;36(6):1660\u20131666. doi:10.1519\/JSC.0000000000003679"},{"issue":"4","key":"r32","series-title":"J Sports Sci","doi-asserted-by":"publisher","first-page":"370","DOI":"10.1080\/02640414.2018.1504602","article-title":"Application of the principal component waveform analysis to identify improvements in vertical jump performance","volume":"37","author":"Flor\u00eda P","year":"2019","unstructured":"Flor\u00eda P, S\u00e1nchez-Sixto A, Harrison AJ. Application of the principal component waveform analysis to identify improvements in vertical jump performance. J Sports Sci. 2019;37(4):370\u2013377. doi:10.1080\/02640414.2018.1504602"}],"container-title":["International Journal of Sports Physiology and Performance"],"original-title":[],"link":[{"URL":"https:\/\/journals.humankinetics.com\/view\/journals\/ijspp\/21\/1\/article-p106.xml","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.humankinetics.com\/downloadpdf\/journals\/ijspp\/21\/1\/article-p106.xml","content-type":"text\/html","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/journals.humankinetics.com\/downloadpdf\/journals\/ijspp\/21\/1\/article-p106.xml","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,12,17]],"date-time":"2025-12-17T17:50:04Z","timestamp":1765993804000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.humankinetics.com\/view\/journals\/ijspp\/21\/1\/article-p106.xml"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,1,1]]},"references-count":64,"journal-issue":{"issue":"1"},"URL":"https:\/\/doi.org\/10.1123\/ijspp.2025-0320","relation":{},"ISSN":["1555-0265","1555-0273"],"issn-type":[{"type":"print","value":"1555-0265"},{"type":"electronic","value":"1555-0273"}],"subject":[],"published":{"date-parts":[[2026,1,1]]}}}