Neuromuscular Changes and Damage after Isoload versus Isokinetic Eccentric Exercise.

Purpose: This study compared the effects of isoload (IL) and isokinetic (IK) knee extensor eccentric exercises on changes in muscle damage and neuromuscular parameters to test the hypothesis that the changes would be different after IL and IK exercises. Methods: Twenty-two young men were paired based on their strength and placed to IL (N = 11) or IK (N = 11) group. IL group performed 15 sets of 10 eccentric contractions with a 150% of pre-determined 1-RM load. IK group performed 15 sets of a number of maximal eccentric contractions matched set-by-set for the total amount of work and mean angular velocity with the IL group. Muscle damage markers (voluntary isometric peak torque, muscle soreness, creatine kinase activity: CK) and neuromuscular variables (e.g., voluntary activation, H-reflex, M-wave, evoked torque) were measured before, immediately after and 24, 48, 72 and 96 h post-exercise. Results: Voluntary isometric peak torque decreased to the same extent (p = 0.94) in both groups at immediately after (IL: -40.6 +/- 13.8% vs. IK: -42.4 +/- 10.2%) to 96 h after the exercise (IL: -21.8 +/- 28.5% vs. IK: -26.7 +/- 23.5%). Neither peak muscle soreness (IL: 48.1 +/- 28.2 mm vs. IK: 54.7 +/- 28.9 mm; p = 0.57) nor CK activity (IL: 12811 +/- 22654 U/L vs. IK: 15304 +/- 24739 U/L; p = 0.59) significantly differed between groups. H-reflex (IL: -23% vs. IK: -35%) and M wave (IL: -10% vs. IK: -17%) significantly decreased immediately post-exercise similarly between groups. Conclusion: The changes in muscle damage and neuromuscular function after the exercise are similar between IL and IK, suggesting that resistance modality has little effects on acute muscle responses. (C) 2016 American College of Sports Medicine

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