Reference values for fatigued versus non‑fatigued limb symmetry index measured by a newly designed single‑leg hop test battery in healthy subjects: a pilot study
I. Leister, G. Mattiassich, H. Kindermann - Reference values for fatigued versus non‑fatigued limb symmetry index measured by a newly designed single‑leg hop test battery in healthy subjects: a pilot study - Sport Sciences for Health, 2017
Objective: There is sparse evidence for return to sport criteria after anterior cruciate ligament (ACL) ruptures. Functional performance deficits, particularly in fatigued muscular condition, should be verified prior to the attempt to return to high-risk pivoting sports after knee injury. The purpose of this study was to investigate the Limb Symmetry Index (LSI) of healthy subjects in fatigued and non-fatigued muscular condition in a newly designed test battery.
Design: Cross-sectional observational study; Level of evidence: 4; Forty-two healthy subjects (22 females, 20 males; mean (SD) age: 30.4 (6.6) years) were evaluated using a test battery consisting of an isometric strength test, a series of five single-leg hop tests and an integrated fatigue protocol.
Results: The overall LSI was 98.7% (3.8) mean (SD) and 97.6% of participants had normal LSI (>90%). The fatigue protocol resulted in an average reduction in single-leg hop distance by 10.5 (15.6) cm (p < 0.001, 95%CI 5.6-15.4). No clinically relevant differences in LSI were found for the contextual factors sex, age and physical activity.
Conclusion: The clinical utility to facilitate the decision for return to sport will be addressed in a parallel study, in which we evaluate patients after ACL reconstruction.