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The effect of short term isokinetic training on limb velocity.

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Strength increases following short-term bouts of isokinetic training have been demonstrated in the past without regard to limb velocity adaptations. This has been attributed to increased neuromotoric efficiency, rather than peripheral muscular hypertrophy. The purpose of this study was to determine the effects of a short-term isokinetic training regimen on limb velocity. Sixty subjects volunteered to participate and were randomly assigned to one of three groups; control (10 males, 10 females), slow (10 males, 10 females) and fast (10 males, 10 females). Each group was pre-tested by performing five repetitions of concentric/concentric knee extension/flexion movements at 60 and 240 d/s on a Kin-Com isokinetic dynamometer. The slow (60 d/s) and fast (240 d/s) groups then completed two days of training (separated by 48--72 hours) consisting of three sets of eight repetitions while the control group did not train. All groups were post-tested at 7--9 days after the pre-test. Data were collected from the middle three repetitions at 1000 Hz and separated into three velocity ROM phases of acceleration (ACCROM), load range (LR) and deceleration (DCCROM) along with peak force. Four univariate (ACCROM, LR, DCCROM & Force) four-way (2 velocities x 2 genders x 2 times x 3 groups) mixed factorial ANOVA's were performed to analyze the data. Results demonstrated significant decreases in ACCROM and increases in LR between pre and post-tests for the slow group at the slow velocity (ACCROM-1.25 +/- .04 deg vs 1.08 +/- .03 deg; LR-74.80 +/- .11 deg vs 75.35 +/- .09 deg) and for the fast group at the fast velocity (ACCROM-14.24 +/- .33 deg vs 13.59 +/- .29 deg; LR-39.73 +/- .32 deg vs 40.59 +/- .25 deg). Force and DCCROM exhibited no significant differences between testing days for any group. These results collectively point to short-term isokinetic training resulting in

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