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Comparison of recovery strategies on maximal force-generating capacity and electromyographic activity level of the knee extensor muscles [with consumer summary]
Zarrouk N, Rebai H, Yahia A, Souissi N, Hug F, Dogui M
Journal of Athletic Training 2011 Jul-Aug;46(4):386-394
clinical trial
3/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: No; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

CONTEXT: With regard to intermittent training exercise, the effects of the mode of recovery on subsequent performance are equivocal. OBJECTIVE: To compare the effects of 3 types of recovery intervention on peak torque (PT) and electromyographic (EMG) activity of the knee extensor muscles after fatiguing isokinetic intermittent concentric exercise. DESIGN: Crossover study. SETTING: Research laboratory. PATIENTS OR OTHER PARTICIPANTS: Eight elite judo players (age 18.4 +/- 1.4 years, height 180 +/- 3 cm, mass 77.0 +/- 4.2 kg). INTERVENTION(S): Participants completed 3 randomized sessions within 7 days. Each session consisted of 5 sets of 10 concentric knee extensions at 80% PT at 120/s, with 3 minutes of recovery between sets. Recovery interventions were passive, active, and electromyostimulation. The PT and maximal EMG activity were recorded simultaneously while participants performed isokinetic dynamometer trials before and 3 minutes after the resistance exercise. MAIN OUTCOME MEASURE(S): The PT and maximal EMG activity from the knee extensors were quantified at isokinetic velocities of 60/s, 120/s, and 180/s, with 5 repetitions at each velocity. RESULTS: The reduction in PT observed after electromyostimulation was less than that seen after passive (p < 0.001) or active recovery (p < 0.001). The reduction in PT was less after passive recovery than after active recovery (p < 0.001). The maximal EMG activity level observed after electromyostimulation was higher than that seen after active recovery (p < 0.05). CONCLUSIONS: Electromyostimulation was an effective recovery tool in decreasing neuromuscular fatigue after high-intensity, intermittent isokinetic concentric exercise for the knee extensor muscles. Also, active recovery induced the greatest amount of neuromuscular fatigue.

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