Article

The aim was to examine the effects of muscle fatigue of knee extensor and hip
abductor muscles on dynamic standing balance of patients with patellofemoral pain
syndrome (PFPS) compared to their healthy matched controls. Thirty participants
(15 with PFPS, 15 controls) were recruited. Isolated muscle fatigue of two
muscles was induced isokinetically in three separate sessions (one practice and
two testing sessions) with a rest interval of at least 72h. In each testing
session, fatigue protocol of only one muscle group was performed for the both
legs with a rest time of 30min. After determining peak torque, participants were
encouraged to perform continuous maximal concentric-eccentric contraction of the
target muscle until the torque output dropped below 50% of peak value for 3
consecutive repetitions. Immediately after the completion of the fatigue
protocol, balance testing of participants was undertaken during single leg
standing using the Biodex stability system. Balance stability measures included
the overall, anteroposterior and mediolateral stability indices (OSI, APSI and
MLSI, respectively). Patients exhibited decreased balance stability in the
sagittal plane (higher APSI) when compared to controls. Isolated muscle fatigue
of the knee extensors and hip abductors reduced balance stability in both study
groups. Fatigue of hip abductors was associated with greater balance instability
(higher OSI and APSI) than fatigue of knee extensors.
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Langue : ANGLAIS