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Influence of Gastrocnemius Muscle Length on Overhead Squat Movement Compensations Among Active-Duty Firefighters: 1633 Board #308 June 1 9

METHODS: 15 healthy college-aged subjects performed squat and supine bridge exercises in both a BI and UNI stance, and a UNI standing hip abduction exercise. The dominant (DOM) leg acted as the supporting leg in UNI exercises. Gmed electromyography activity from both left and right side was collected during the 3 exercises and normalized to a maximal voluntary isometric contraction (MVIC). Average μV was collected for 3 repetitions (paced at 2 s) of each exercise (total 6s). RESULTS: During the squat, Gmed activity in the DOM leg had a significantly higher (p<0.01) muscle activity in UNI (36.7 %MVIC) compared to BI (9.4 %MVIC) stance, whereas Gmed in the non-DOM leg was similar for both stances (UNI 10.7 and BI 9.9 %MVIC; p=0.63). During supine bridge, Gmed in DOM leg was significantly increased (p<0.01) in UNI (33.2%MVIC) compared to BI (14.7 %MVIC). In contrast, the non-DOM leg displayed a significant lower activity (p<0.01) in UNI (7.0%MVIC) compared to BI (15.3%MVIC) stance. For UNI standing hip abduction DOM leg (34.5 %MVIC) had higher muscle activation (p<0.01) compared to non-DOM leg (24.7%MVIC). CONCLUSION: Highest total muscle activity (left and right side) in Gmed was found in standing hip abduction, whereas Gmed maximum activity on one side only was similar for the DOM leg in UNI stance in all three exercises (33-37% bridge, hip abduction, squat). Knowledge about Gmed activation magnitude on both sides can aid in selection of strengthening exercises which targets Gmed.