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Time Course of Strength and Echo Intensity Recovery After Resistance Exercise in Women

Radaelli, Regis1; Bottaro, Martim2; Wilhelm, Eurico N.1; Wagner, Dale R.3; Pinto, Ronei S.1

Journal of Strength & Conditioning Research:
doi: 10.1519/JSC.0b013e31823dae96
Original Research

Abstract: Radaelli, R, Bottaro, M, Wilhelm, EN, Wagner, DR, and Pinto, RS. Time course of strength and echo intensity recovery after resistance exercise in women. J Strength Cond Res 26(9): 2577–2584, 2012—The purpose of this study was to evaluate the time course responses of strength, delayed-onset muscle soreness (DOMS), muscle thickness (MT), circumference (CIRC), and ultrasonography echo intensity (EI) after a traditional hypertrophic isoinertial resistance training session in young women. Ten (22.0 ± 3.2 years) healthy, untrained volunteers participated in the study. The resistance exercise session consisted of 4 sets of 10 repetitions at 80% of 1 repetition maximum (1RM) of the dominant arm elbow flexors. Maximum isometric elbow flexion peak torque (PT) at 90°, MT, and EI were recorded for both arms at baseline (PRE), immediately after exercise (0 hours) and at 24, 48, and 72 hours after exercise. Comparisons were made using a 2 × 5 mixed factor analysis of variance. There was a significant (p < 0.05) loss in PT and increase in MT at 0, 24, 48, and 72 hours. In contrast, EI increased only after 24, 48, and 72 hours, not at 0 hours. There were no significant changes in PT, DOMS, MT, and EI in the nondominant (control) arm after the exercise protocol. Our data suggest that after 4 sets of 80% of 1RM of unilateral elbow flexion resistance exercise, nonresistance trained women need >72 hours to fully recover muscle strength, MT, CIRC, and EI. Furthermore, the EI appears to be a sensitive and reliable method to assess MD.

Author Information

1Exercise Laboratory Research, Physical Education School, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil

2Strength Training Laboratory, College of Physical Education and Exercise Science, University of Brasília, Brasília, Brazil

3Health, Physical Education, and Recreation Department, Utah State University, Logan, Utah

Address correspondence to Régis Radaelli,

© 2012 National Strength and Conditioning Association