{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T14:12:58Z","timestamp":1790518378064,"version":"4.1.0"},"reference-count":34,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2021,4,12]],"date-time":"2021-04-12T00:00:00Z","timestamp":1618185600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004564","name":"Ministarstvo Prosvete, Nauke i Tehnolo\u0161kog Razvoja","doi-asserted-by":"publisher","award":["179011"],"award-info":[{"award-number":["179011"]}],"id":[{"id":"10.13039\/501100004564","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Provincial Secretariat for Higher Education and Scientific Research","award":["142-451-2094"],"award-info":[{"award-number":["142-451-2094"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>Athletes\u2019 lifestyles have been dramatically affected by the coronavirus disease 2019 (COVID-19) pandemic. Since COVID-19 primarily affects the respiratory system and to a lesser degree the cardiovascular system, the goal of this study was to examine the effects of COVID-19-caused detraining on cardiorespiratory fitness (CRF) of recently recovered volleyball athletes. Sixteen experienced volleyball athletes (age 24 \u00b1 4.5 years) who were recently diagnosed and recovered from a COVID-19 infection volunteered to participate in this study and were tested for CRF and spirometry. Given that participants had only mild symptoms of infection, the primary focus of this study was on the effects of detraining on CRF. On average, the time to exhaustion was 9.4 \u00b1 1.4 min. VE, VCO2, RER and oxygen pulse increased, heart rate exceeded 90% of predicted values, and peak VO2 values were typical for this level of athlete (44.1 \u00b1 3.4 mL\/kg). Pulmonary function reflected in FVC, FEV1\/FVC and MVV values were well above 80% of predicted values for each of the participants while electrocardiography revealed no ischemia, arrythmias or conduction and repolarization abnormalities were found in the tested subjects. Therefore, it can be concluded that participants experienced typical consequences of detraining. Due to a lack of CRF data prior to COVID-19 infection, we were unable to estimate the magnitude detraining had on CRF. Complete CRF assessment after COVID-19 infection in athletes can be useful for screening of residual myocardial and\/or respiratory system damage for safe return-to-play decisions.<\/jats:p>","DOI":"10.3390\/ijerph18084059","type":"journal-article","created":{"date-parts":[[2021,4,12]],"date-time":"2021-04-12T11:05:06Z","timestamp":1618225506000},"page":"4059","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Cardiorespiratory Fitness in Volleyball Athletes Following a COVID-19 Infection: A Cross-Sectional Study"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4398-8093","authenticated-orcid":false,"given":"Aleksandra","family":"Milovancev","sequence":"first","affiliation":[{"name":"Faculty of Medicine, University of Novi Sad, 21000 Novi Sad, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jovana","family":"Avakumovic","sequence":"additional","affiliation":[{"name":"Health Center \u201cNovi Sad\u201d, 21000 Novi Sad, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nemanja","family":"Lakicevic","sequence":"additional","affiliation":[{"name":"Sport and Exercise Sciences Research Unit, University of Palermo, 90133 Palermo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4000-7624","authenticated-orcid":false,"given":"Valdemar","family":"Stajer","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Physical Education, University of Novi Sad, 21000 Novi Sad, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2510-3044","authenticated-orcid":false,"given":"Darinka","family":"Korovljev","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Physical Education, University of Novi Sad, 21000 Novi Sad, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nikola","family":"Todorovic","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Physical Education, University of Novi Sad, 21000 Novi Sad, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8334-6581","authenticated-orcid":false,"given":"Antonino","family":"Bianco","sequence":"additional","affiliation":[{"name":"Sport and Exercise Sciences Research Unit, University of Palermo, 90133 Palermo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nebojsa","family":"Maksimovic","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Physical Education, University of Novi Sad, 21000 Novi Sad, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7270-2541","authenticated-orcid":false,"given":"Sergej","family":"Ostojic","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Physical Education, University of Novi Sad, 21000 Novi Sad, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2075-6038","authenticated-orcid":false,"given":"Patrik","family":"Drid","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Physical Education, University of Novi Sad, 21000 Novi Sad, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,4,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"531","DOI":"10.1093\/qjmed\/hcaa201","article-title":"The psychological impact of COVID-19 on the mental health in the general population","volume":"113","author":"Serafini","year":"2020","journal-title":"QJM"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1239","DOI":"10.1001\/jama.2020.2648","article-title":"Characteristics of and important lessons from the coronavirus disease 2019 (COVID-19) outbreak in China","volume":"323","author":"Wu","year":"2020","journal-title":"JAMA"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"221","DOI":"10.1177\/1941738120918876","article-title":"Coronavirus disease 2019 (COVID-19): Considerations for the competitive athlete","volume":"12","author":"Toresdahl","year":"2020","journal-title":"Sports Health"},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Paoli, A., and Musumeci, G. (2020). Elite athletes and COVID-19 lockdown: Future health concerns for an entire sector. J. Funct. Morphol. Kinesiol., 5.","DOI":"10.3390\/jfmk5020030"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1417","DOI":"10.1007\/s40279-020-01297-6","article-title":"Impact of Potential Physiological Changes due to COVID-19 Home Confinement on Athlete Health Protection in Elite Sports: A Call for Awareness in Sports Programming","volume":"50","author":"Sarto","year":"2020","journal-title":"Sports Med."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1007\/s40279-015-0425-5","article-title":"Benefits and Limitations of Block Periodized Training Approaches to Athletes\u2019 Preparation: A Review","volume":"46","author":"Issurin","year":"2016","journal-title":"Sports Med."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"246","DOI":"10.1136\/bjsm.34.4.246","article-title":"Effects of exercise on lymphocytes and cytokines","volume":"34","author":"Pendersen","year":"2000","journal-title":"Br. J. Sports Med."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"46","DOI":"10.1097\/00005768-200001000-00008","article-title":"The symptomatology of upper respiratory tract infections and exercise in elderly people","volume":"32","author":"Kostka","year":"2000","journal-title":"Med. Sci. Sports Exerc."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1737","DOI":"10.1249\/MSS.0000000000000953","article-title":"Leisure-Time Physical Activity and the Risk of Suspected Bacterial Infections","volume":"48","author":"Pape","year":"2016","journal-title":"Med. Sci. Sports Exerc."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"201","DOI":"10.1016\/j.jshs.2018.09.009","article-title":"The compelling link between physical activity and the body\u2019s defense system","volume":"8","author":"Nieman","year":"2019","journal-title":"J. Sport Health Sci."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1209","DOI":"10.1007\/s40520-020-01588-y","article-title":"Stay fit, don\u2019t quit: Geriatric Exercise Prescription in COVID-19 Pandemic","volume":"32","author":"Lakicevic","year":"2020","journal-title":"Aging Clin. Exp. Res."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Narici, M., De Vito, G., Franchi, M., Paoli, A., Moro, T., Marcolin, G., Grassi, B., Baldassarre, G., Zuccarelli, L., and Biolo, G. (2020). Impact of sedentarism due to the COVID-19 home confinement on neuromuscular, cardiovascular and metabolic health: Physiological and pathophysiological implications and recommendations for physical and nutritional countermeasures. Eur. J. Sport Sci.","DOI":"10.1080\/17461391.2020.1761076"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1378","DOI":"10.1002\/oby.22849","article-title":"Does High Cardiorespiratory Fitness Confer Some Protection Against Proinflammatory Responses After Infection by SARS-CoV-2?","volume":"28","author":"Francaux","year":"2020","journal-title":"Obesity"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"782","DOI":"10.1001\/jama.2020.12839","article-title":"Pathophysiology, Transmission, Diagnosis, and Treatment of Coronavirus Disease 2019 (COVID-19): A Review","volume":"324","author":"Wiersinga","year":"2020","journal-title":"JAMA"},{"key":"ref_15","unstructured":"Hoffman, J. (2006). Norms for Fitness, Performance, and Health, Human Kinetics."},{"key":"ref_16","first-page":"60","article-title":"Differences in aerobic capacity indicators between the Croatian national team and club level volleyball players","volume":"46","year":"2014","journal-title":"Kinesiology"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1198","DOI":"10.13189\/ujer.2019.070505","article-title":"Relationship between repeated sprint ability and aerobic fitness in college volleyball players","volume":"7","author":"Eryilmaz","year":"2019","journal-title":"Univers. J. Educ. Res."},{"key":"ref_18","first-page":"33","article-title":"The effect of beach volleyball training on running economy and VO2max of indoor volleyball players","volume":"13","author":"Balasas","year":"2013","journal-title":"J. Phys. Educ. Sport"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Clavario, P., De Marzo, V., Lotti, R., Barbara, C., Porcile, A., Russo, C., Beccaria, F., Bonavia, M., Bottaro, L., and Caltabellotta, M. (2020). Assessment of functional capacity with cardiopulmonary exercise testing in non-severe COVID-19 patients at three months follow-up. medRxiv.","DOI":"10.1101\/2020.11.15.20231985"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"100683","DOI":"10.1016\/j.eclinm.2020.100683","article-title":"Medium-term effects of SARS-CoV-2 infection on multiple vital organs, exercise capacity, cognition, quality of life and mental health, post-hospital discharge","volume":"31","author":"Raman","year":"2020","journal-title":"EClinicalMedicine"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"79","DOI":"10.2165\/00007256-200030020-00002","article-title":"Detraining: Loss of training induced physiological and performance adaptation. Part I. Short term insufficient training stimulus","volume":"30","author":"Mujika","year":"2000","journal-title":"Sports Med."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"95","DOI":"10.1152\/jappl.1986.60.1.95","article-title":"Effects of detraining on cardiovascular responses to exercise: Role of blood volume","volume":"60","author":"Coyle","year":"1986","journal-title":"J. Appl. Physiol."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"1857","DOI":"10.1152\/jappl.1984.57.6.1857","article-title":"Time course of loss of adaptations after stopping prolonged intense endurance training","volume":"57","author":"Coyle","year":"1984","journal-title":"J. Appl. Physiol."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1719","DOI":"10.1152\/jappl.1987.63.5.1719","article-title":"Effect of training\/detraining on submaximal exercise responses in humans","volume":"63","author":"Moore","year":"1987","journal-title":"J. Appl. Physiol."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1444","DOI":"10.1152\/jappl.1993.75.4.1444","article-title":"Effects of detraining on endurance capacity and metabolic changes during prolonged exhaustive exercise","volume":"75","author":"Madsen","year":"1993","journal-title":"J. Appl. Physiol."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"572","DOI":"10.1055\/s-2007-1024567","article-title":"Effect of short-term training cessation on performance measures in distance runners","volume":"13","author":"Houmard","year":"1992","journal-title":"Int. J. Sports Med."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"2124","DOI":"10.1172\/JCI116813","article-title":"The regulation of adipose tissue and muscle lipoprotein lipase in runners by detraining","volume":"92","author":"Simsolo","year":"1993","journal-title":"J. Clin. Investig."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"776","DOI":"10.1152\/jappl.1993.74.2.776","article-title":"Training cessation does not alter GLUT-4 protein levels in human skeletal muscle","volume":"74","author":"Houmard","year":"1993","journal-title":"J. Appl. Physiol."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"704","DOI":"10.1152\/jappl.1989.66.2.704","article-title":"Effects of acute exercise and detraining on insulin action in trained men","volume":"66","author":"Mikines","year":"1989","journal-title":"J. Appl. Physiol."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"240","DOI":"10.1152\/jappl.1996.80.1.240","article-title":"Changes in insulin action and GLUT-4 with 6 days of inactivity in endurance runners","volume":"80","author":"Vukovich","year":"1996","journal-title":"J. Appl. Physiol."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"149","DOI":"10.1016\/S0167-5273(98)00102-8","article-title":"Cardiovascular adaptations to endurance training and detraining in young and older athletes","volume":"65","author":"Giada","year":"1998","journal-title":"Int. J. Cardiol."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"104","DOI":"10.1007\/BF00846029","article-title":"Effects of age and regular exercise on muscle strength and endurance","volume":"60","author":"Laforest","year":"1990","journal-title":"Eur. J. Appl. Physiol. Occup. Physiol."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1265","DOI":"10.1001\/jamacardio.2020.3557","article-title":"Outcomes of Cardiovascular Magnetic Resonance Imaging in Patients Recently Recovered From Coronavirus Disease 2019 (COVID-19)","volume":"5","author":"Puntmann","year":"2020","journal-title":"JAMA Cardiol."},{"key":"ref_34","first-page":"116","article-title":"Cardiovascular Magnetic Resonance Findings in Competitive Athletes Recovering From COVID-19 Infection","volume":"6","author":"Rajpal","year":"2021","journal-title":"JAMA Cardiol."}],"container-title":["International Journal of Environmental Research and Public Health"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1660-4601\/18\/8\/4059\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T13:59:45Z","timestamp":1760363985000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1660-4601\/18\/8\/4059"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,4,12]]},"references-count":34,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2021,4]]}},"alternative-id":["ijerph18084059"],"URL":"https:\/\/doi.org\/10.3390\/ijerph18084059","relation":{},"ISSN":["1660-4601"],"issn-type":[{"value":"1660-4601","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,4,12]]}}}