Abstract
Purpose
The purpose of this study was to investigate the contralateral and ipsilateral repeated bout effects of eccentric contractions (ECCs) on muscle fiber activation using transverse relaxation time (T2) of magnetic resonance imaging (MRI).
Methods
Eleven men (22.3 ± 2.9 years) performed two bouts of 30 maximal ECCs of the elbow flexors spaced 2 weeks apart. Initially, all subjects performed 30 ECCs for one arm (ECC1). After 2 weeks, they performed 30 ECCs for both ipsilateral arm (IL-RBE) and contralateral arm (CL-RBE). Measurements were maximal voluntary isometric contraction (MVC) torque, range of motion (ROM), muscle soreness, cross-sectional area (CSA), and T2 at before, immediately after, 1, 2, 3, and 5 days after ECCs.
Results
The loss of MVC torque, limited ROM, and developed muscle soreness and CSA were inhibited for IL-RBE and CL-RBE compared with ECC1 (p < 0.05). The acute T2, which is an indicator of the activation of muscle fibers, was longer for IL-RBE and CL-RBE than ECC1 (p < 0.05). Otherwise, no significant difference between IL-RBE and CL-RBE was observed in other measurements.
Conclusion
Our results suggest that one of the mechanisms for CL-RBE of ECCs is the increase in muscle fiber activation. In addition, the magnitude of protective effect for CL-RBE was similar to the IL-RBE in untrained young men.
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Abbreviations
- ANOVA:
-
Analysis of variance
- CL-RBE:
-
Contralateral repeated bout effects
- CSA:
-
Cross-sectional area
- DOMS:
-
Delayed-onset muscle soreness
- ECCs:
-
Eccentric contractions
- IL-RBE:
-
Ipsilateral repeated bout effects
- MRI:
-
Magnetic resonance imaging
- MVC:
-
Maximal voluntary isometric contraction
- RBE:
-
Repeated bout effects
- ROM:
-
Range of motion
- T2:
-
Transverse relaxation time
- VAS:
-
Visual analog scale
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YT, KN and EO conceived the study. YT and EO participated in the design and coordination of the study. YT carried out the data collection and performed the statistical analysis. KN and EO helped to draft the manuscript. All authors read and approved the final manuscript.
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Communicated by William J. Kraemer.
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421_2018_3933_MOESM1_ESM.docx
Supplemental Digital Content 1. Figure that illustrates the changes (mean ± SD) in muscle damage after eccentric contractions at initial session (ECC1) in both arms (DOCX 1545 KB)
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Tsuchiya, Y., Nakazato, K. & Ochi, E. Contralateral repeated bout effect after eccentric exercise on muscular activation. Eur J Appl Physiol 118, 1997–2005 (2018). https://doi.org/10.1007/s00421-018-3933-9
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DOI: https://doi.org/10.1007/s00421-018-3933-9