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The Capital Region of Denmark - a part of Copenhagen University Hospital
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Performance changes during the off-season period in football players - Effects of age and previous hamstring injury

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The aims of this study were to investigate changes in selected performance measures during an off-season period, their association, and the potential role of age and previous hamstring injury in semi-professional and amateur football players. Seventy-four male players (age: 25 ± 4 years, stature: 178.0 ± 6.6 cm, body mass: 74.9 ± 8.1 kg) were assessed at the beginning and end of the off-season summer-period for sprint, change-of-direction performance and eccentric hamstring strength. Small to medium increases in sprint times were observed at 5 (d = 0.26, p = 0.057), 10 (d = 0.42, p < 0.001) and 30 m (d = 0.64, p < 0.001). Small (d = -0.23, p = 0.033) improvements were observed for COD performance, and no changes in eccentric hamstring strength (d = 0.10, p = 0.317). The changes in the outcomes were not affected by age (p = 0.449 to 0.928) or previous hamstring injury (p = 0.109 to 0.995). The impaired sprint performance was not related to changes in eccentric hamstring strength (r = -0.21 to 0.03, p = 0.213 to 0.856), instead, changes in COD performance were associated with changes in eccentric hamstring strength (r = -0.42, p = 0.008).

Original languageEnglish
JournalJournal of Sports Sciences
Volume38
Issue number21
Pages (from-to)2489-2499
Number of pages11
ISSN0264-0414
DOIs
Publication statusPublished - Nov 2020

    Research areas

  • detraining, injury prevention, pre-season, Soccer, transition period, Motor Skills/physiology, Prospective Studies, Age Factors, Hamstring Muscles/injuries, Humans, Risk Factors, Soccer/injuries, Male, Running/physiology, Young Adult, Muscle Contraction, Athletic Performance/physiology, Physical Conditioning, Human, Adult, Seasons, Muscle Strength

ID: 60404773