Contralateral Repeated Bout Effect of Eccentric Exercise of the Elbow Flexors

Purpose: This study compared the magnitude of the repeated bout effect (RBE) for different time intervals between two bouts of eccentric exercise of the elbow flexors to better understand the contralateral RBE (CL-RBE). Methods: Untrained young men (22.0 ± 1.8 yr) were allocated to either a control or one of seven CL-RBE groups (n = 13 per group). The CL-RBE groups performed exercise consisting of 30 maximal isokinetic (30°·s−1) eccentric contractions of the elbow flexors (ECC1) with either dominant or nondominant arm followed 0.5 h, 6 h, 12 h, 24 h (1 d), 7 d (1 wk), 28 d (4 wk), or 56 d (8 wk) by the same exercise (ECC2) using the opposite arm. The control group used the nondominant arm for ECC1 and ECC2 separated by 2 wk. Results: Maximal voluntary concentric contraction torque, peak torque angle, range of motion, upper arm circumference, muscle soreness, ultrasound echo intensity, and plasma creatine kinase activity and myoglobin concentration changed (P 8 wk) and requires a day to be conferred.

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