{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,29]],"date-time":"2026-06-29T22:37:31Z","timestamp":1782772651644,"version":"3.54.5"},"reference-count":22,"publisher":"Journal of Sports Science and Medicine","license":[{"start":{"date-parts":[[2025,6,1]],"date-time":"2025-06-01T00:00:00Z","timestamp":1748736000000},"content-version":"am","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["jsportscimed"],"abstract":"<jats:p>Dynamic stretching (DS) is a conditioning technique commonly used in sports. However, its effects on contralateral joint flexibility and elastic properties of the targeted muscle over several weeks remain unclear. Similarly, its impact on muscle functions, such as force or power exertion, is poorly understood. This study aimed to examine the effects of a 12-week DS program targeting the ankle plantar flexors on the joint flexibility, muscle strength, and elastic properties of the plantar flexors in stretched and contralateral legs. Eighteen healthy young adults (12 males and six females, aged 18-24 years) participated in this study. DS was performed on one leg of the ankle plantar flexors for 12 weeks (3 days weekly), while the other leg served as a non-intervention. Dorsiflexion range of motion (DFROM), muscle stiffness, and ankle plantar flexion strength (rate of torque development and isokinetic muscle strength) were assessed before and after the intervention. The muscle stiffness was measured using shear wave elastography on the gastrocnemius. DFROM significantly increased in both conditions (p &lt; 0.05), whereas gastrocnemius stiffness significantly decreased only in the DS condition (p &lt; 0.05). No significant changes were observed in the non-intervention condition. The ankle plantar flexion rates of torque development and isokinetic strength did not change in either condition. These findings suggest that 12 weeks of DS can reduce muscle stiffness and improve joint flexibility without affecting muscle strength while enhancing contralateral joint flexibility without altering muscle stiffness or strength.<\/jats:p>","DOI":"10.52082\/jssm.2025.326","type":"journal-article","created":{"date-parts":[[2025,4,17]],"date-time":"2025-04-17T10:54:58Z","timestamp":1744887298000},"page":"326-331","source":"Crossref","is-referenced-by-count":2,"title":["Effect of 12-Week Dynamic Stretching of Ankle Plantar Flexors on Joint Flexibility and Musculoskeletal Properties in The Contralateral Muscle"],"prefix":"10.52082","author":[{"given":"Naoki","family":"Ikeda","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kazuya","family":"Hiratsuka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tadao","family":"Isaka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"29163","published-online":{"date-parts":[[2025,6,1]]},"reference":[{"key":"ref0","doi-asserted-by":"publisher","unstructured":"Aagaard P., Simonsen E.B., Andersen J.L., Magnusson P., Dyhre-Poulsen P. (2002) Increased rate of force development and neural drive of human skeletal muscle following resistance training. Journal of Applied Physiology 93, 1318-1326.  Crossref","DOI":"10.1152\/japplphysiol.00283.2002"},{"key":"ref1","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Bacurau R.F., Monteiro G.A., Ugrinowitsch C., Tricoli V., Cabral L.F., Aoki M.S. (2009) Acute effect of a ballistic and a static stretching exercise bout on flexibility and maximal strength. Journal of Strength and Conditioning Research 23, 304-308.  Crossref","DOI":"10.1519\/jsc.0b013e3181874d55"},{"key":"ref2","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Barbosa G.M., Trajano G.S., Dantas G.A.F., Silva B.R., Vieira W.H.B. (2020) Chronic Effects of Static and Dynamic Stretching on Hamstrings Eccentric Strength and Functional Performance: A Randomized Controlled Trial. Journal of Strength and Conditioning Research 34, 2031-2039.  Crossref","DOI":"10.1519\/jsc.0000000000003080"},{"key":"ref3","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Behm D.G., Alizadeh S., Anvar S.H., Drury B., Granacher U., Moran J. (2021) Non-local Acute Passive Stretching Effects on Range of Motion in Healthy Adults: A Systematic Review with Meta-analysis. Sports Medicine 51, 945-959.  Crossref","DOI":"10.1007\/s40279-020-01422-5"},{"key":"ref4","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Behm D.G., Blazevich A.J., Kay A.D., McHugh M. (2016) Acute effects of muscle stretching on physical performance, range of motion, and injury incidence in healthy active individuals: a systematic review. Applied Physiology, Nutrition, and Metabolism 41, 1-11.  Crossref","DOI":"10.1139\/apnm-2015-0235"},{"key":"ref5","unstructured":"Journal of Sports Science and Medicine Cohen, J. (1988) Statistical Power Analysis for the Behavioral Science. 2nd ed. Hillsdale: Lawrence Erlbaum Associates."},{"key":"ref6","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Freitas S.R., Mendes B., Le Sant G., Andrade R.J., Nordez A., Milanovic Z. (2018) Can chronic stretching change the muscle-tendon mechanical properties? A review. Scandinavian Journal of Medicine & Science in Sports 28, 794-806.  Crossref","DOI":"10.1111\/sms.12957"},{"key":"ref7","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Ikeda N., Hiratsuka K., Isaka T. (2024) Effect of 6-Week Instrument-Assisted Soft Tissue Mobilization on Joint Flexibility and Musculotendinous Properties. Sports (Basel) 12, 150.  Crossref","DOI":"10.3390\/sports12060150"},{"key":"ref8","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Ikeda N., Yonezu T., Kawakami Y. (2021) Minute oscillation stretching: A novel modality for reducing musculo-tendinous stiffness and maintaining muscle strength. Scandinavian Journal of Medicine & Science in Sports 31, 104-114.  Crossref","DOI":"10.1111\/sms.13830"},{"key":"ref9","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Konrad A., Alizadeh S., Daneshjoo A., Anvar S.H., Graham A., Zahiri A., Goudini R., Edwards C., Scharf C., Behm D.G. (2024) Chronic effects of stretching on range of motion with consideration of potential moderating variables: A systematic review with meta-analysis. Journal of Sport and Health Science 13, 186-194.  Crossref","DOI":"10.1016\/j.jshs.2023.06.002"},{"key":"ref10","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Konrad A., Tilp M. (2014) Effects of ballistic stretching training on the properties of human muscle and tendon structures. Journal of Applied Physiology 117, 29-35.  Crossref","DOI":"10.1152\/japplphysiol.00195.2014"},{"key":"ref11","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Maffiuletti N.A., Aagaard P., Blazevich A.J., Folland J., Tillin N., Duchateau J. (2016) Rate of force development: physiological and methodological considerations. European Journal of Applied Physiology 116, 1091-1116.  Crossref","DOI":"10.1007\/s00421-016-3346-6"},{"key":"ref12","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Mahieu N.N., McNair P., De Muynck M. M., Stevens V., Blanckaert I., Smits N., Witvrouw E. (2007) Effect of static and ballistic stretching on the muscle-tendon tissue properties. Medicine and Science in Sports and Exercise 39, 494-501.  Crossref","DOI":"10.1249\/01.mss.0000247004.40212.f7"},{"key":"ref13","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Medeiros D.M., Martini T.F. (2018) Chronic effect of different types of stretching on ankle dorsiflexion range of motion: Systematic review and meta-analysis. Foot (Edinburgh, Scotland) 34, 28-35.  Crossref","DOI":"10.1016\/j.foot.2017.09.006"},{"key":"ref14","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Mizuno T., Umemura Y. (2016) Dynamic Stretching does not Change the Stiffness of the Muscle-Tendon Unit. International Journal of Sports Medicine 37, 1044-1050.  Crossref","DOI":"10.1055\/s-0042-108807"},{"key":"ref15","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Morris S.B., DeShon R.P. (2002) Combining effect size estimates in meta-analysis with repeated measures and independent-groups designs. Psychological Methods 7, 105-125.  Crossref","DOI":"10.1037\/\/1082-989x.7.1.105"},{"key":"ref16","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Nakamura M., Yoshida R., Sato S., Yahata K., Murakami Y., Kasahara K., Fukaya T., Takeuchi K., Nunes J.P., Konrad A. (2022) Cross-education effect of 4-week high- or low-intensity static stretching intervention programs on passive properties of plantar flexors. Journal of Biomechanics 133, 110958.  Crossref","DOI":"10.1016\/j.jbiomech.2022.110958"},{"key":"ref17","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Nelson A.G., Kokkonen J., Winchester J.B., Kalani W., Peterson K., Kenly M.S., Arnall D.A. (2012) A 10-week stretching program increases strength in the contralateral muscle. Journal of Strength and Conditioning Research 26, 832-836.  Crossref","DOI":"10.1519\/jsc.0b013e3182281b41"},{"key":"ref18","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Sekir U., Arabaci R., Akova B., Kadagan S.M. (2010) Acute effects of static and dynamic stretching on leg flexor and extensor isokinetic strength in elite women athletes. Scandinavian Journal of Medicine & Science in Sports 20, 268-281.  Crossref","DOI":"10.1111\/j.1600-0838.2009.00923.x"},{"key":"ref19","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Thomas E., Ficarra S., Nunes J.P., Paoli A., Bellafiore M., Palma A., Bianco A. (2023) Does stretching training influence muscular strength? A systematic review with meta-analysis and meta-regression. Journal of Strength and Conditioning Research 37, 1145-1156.  Crossref","DOI":"10.1519\/jsc.0000000000004400"},{"key":"ref20","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Turki-Belkhiria L., Chaouachi A., Turki O., Chtourou H., Chtara M., Chamari K., Amri M., Behm D.G. (2014) Eight weeks of dynamic stretching during warm-ups improves jump power but not repeated or single sprint performance. European Journal of Sport Science 14, 19-27.  Crossref","DOI":"10.1080\/17461391.2012.726651"},{"key":"ref21","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Yamaguchi T., Ishii K. (2014) An optimal protocol for dynamic stretching to improve explosive performance. Journal of Physical Fitness and Sports Medicine 3, 121-129.  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