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Contralateral repeated bout effect after eccentric exercise on muscular activation

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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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Author information

Authors and Affiliations

Authors

Contributions

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.

Corresponding author

Correspondence to Eisuke Ochi.

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Conflict of interest

The authors declare that they have no conflict of interest.

Additional information

Communicated by William J. Kraemer.

Electronic supplementary material

Below is the link to the electronic supplementary material.

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

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