A17T FREE COMMUNICATION/POSTER SPORT BIOMECHANICS
EFFECT OF THREE EXERCISE MOVEMENTS ON LOWER EXTREMITY POWER AND THE BILATERAL DEFICIT
The purpose of this study was to determine if the bilateral deficit exists for lower extremity power during closed chain exercise.
Twelve male subjects (age = 23 ± 2 yrs) were tested for one-repetition maximum (1-RM) on a closed chain, lower extremity dynamometer. Each subject performed four sets of six repetitions at loads corresponding to 35, 50, 65, and 80% of subject's 1-RM under conditions of unilateral (UN), bilateral (BL), and alternating unilateral (AUN) lower extremity exercise. Mean Crank Power (CP), ankle (AP), knee (KP), and hip (HP) powers were recorded for each leg during each trial.
CP was greatest regarding of protocol at 65% of 1-RM (Values in Table 1 are the mean of right and left legs). CP was greatest (p ≤ 0.05) during UN compared to AUN and BL regardless of resistance. AUN CP was greater (p ≤ 0.05) than BL CP. UN HP was greater (P ≤ 0.05) than AUN and BL HP. UN KP was greater (p ≤ 0.05) than AUN and BL KP. UN AP was greater (P ≤ 0.05) than AUN AP.
These results suggest that the bilateral deficit does exist for lower extremity power during closed chain exercise and this deficit is due in part to lower joint power specific to the hip and knee.©2002The American College of Sports Medicine