Eccentric knee flexor strength profiles of 341 elite male academy and senior Gaelic football players: Do body mass and previous hamstring injury impact performance?

Abstract

ObjectiveReport eccentric knee flexor strength values of elite Gaelic football players from underage to adult level whilst examining the influence of body mass and previous hamstring injury. DesignCross-sectional study. SettingTeam's training facility. ParticipantsElite Gaelic football players (n = 341) from under 14 years to senior age-grades were recruited from twelve teams. Main outcome measuresAbsolute (N) and relative (N·kg−1) eccentric hamstring strength as well as corresponding between-limb imbalances (%) were calculated for all players. ResultsMean maximum force was 329.4N (95% CI 319.5–340.2) per limb. No statistically significant differences were observed in relative force values (4.4 N ·kg−1, 95% CI 4.2–4.5) between age-groups. Body mass had moderate-to-large and weak associations with maximum force in youth (r = 0.597) and adult (r =0 .159) players, respectively. Overall 40% (95 CI 31.4–48.7) presented with a maximum strength between-limb imbalance >10%. Players with a hamstring injury had greater relative maximum force (9.3%, 95% CI 7.0–11.8; p > 0.05) and a 28% (95% CI 10.0–38.0) higher prevalence of between-limb imbalances ≥15% compared to their uninjured counterparts. ConclusionsOverlapping strength profiles across age-groups, combined with greater strength in previously injured players, suggests difficulties for establishing cut-off thresholds associated with hamstring injury risk.