The repeated-bout effect: influence on biceps brachii oxygenation and myoelectrical activity

Muthalib, Makii, Lee, Hoseong, Millet, Guillaume Y., Ferrari, Marco and Nosaka, Kazunori 2011, The repeated-bout effect: influence on biceps brachii oxygenation and myoelectrical activity, Journal of applied physiology, vol. 110, no. 5, pp. 1390-1399, doi: 10.1152/japplphysiol.00191.2010.

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Title The repeated-bout effect: influence on biceps brachii oxygenation and myoelectrical activity
Author(s) Muthalib, Makii
Lee, Hoseong
Millet, Guillaume Y.
Ferrari, Marco
Nosaka, Kazunori
Journal name Journal of applied physiology
Volume number 110
Issue number 5
Start page 1390
End page 1399
Total pages 10
Publisher American Physiological Society
Place of publication Bethesda, Md.
Publication date 2011-05-01
ISSN 8750-7587
Keyword(s) Adult
Muscle Contraction
Muscle, Skeletal
Oxygen Consumption
Physical Endurance
Physical Exertion
Summary This study investigated biceps brachii oxygenation and myoelectrical activity during and following maximal eccentric exercise to better understand the repeated-bout effect. Ten men performed two bouts of eccentric exercise (ECC1, ECC2), consisting of 10 sets of 6 maximal lengthening contractions of the elbow flexors separated by 4 wk. Tissue oxygenation index minimum amplitude (TOI(min)), mean and maximum total hemoglobin volume by near-infrared spectroscopy, torque, and surface electromyography root mean square (EMG(RMS)) during exercise were compared between ECC1 and ECC2. Changes in maximal voluntary isometric contraction (MVC) torque, range of motion, plasma creatine kinase activity, muscle soreness, TOI(min), and EMG(RMS) during sustained (10-s) and 30-repeated isometric contraction tasks at 30% (same absolute force) and 100% MVC (same relative force) for 4 days postexercise were compared between ECC1 and ECC2. No significant differences between ECC1 and ECC2 were evident for changes in torque, TOI(min), mean total hemoglobin volume, maximum total hemoglobin volume, and EMG(RMS) during exercise. Smaller (P < 0.05) changes and faster recovery of muscle damage markers were evident following ECC2 than ECC1. During 30% MVC tasks, TOI(min) did not change, but EMG(RMS) increased 1-4 days following ECC1 and ECC2. During 100% MVC tasks, EMG(RMS) did not change, but torque and TOI(min) decreased 1-4 days following ECC1 and ECC2. TOI(min) during 100% MVC tasks and EMG(RMS) during 30% MVC tasks recovered faster (P < 0.05) following ECC2 than ECC1. We conclude that the repeated-bout effect cannot be explained by altered muscle activation or metabolic/hemodynamic changes, and the faster recovery in muscle oxygenation and activation was mainly due to faster recovery of force.
Language eng
DOI 10.1152/japplphysiol.00191.2010
Field of Research 111699 Medical Physiology not elsewhere classified
06 Biological Sciences
11 Medical And Health Sciences
Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2011, American Physiological Society
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