Contralateral versus ipsilateral protective effect against muscle damage of the elbow flexors and knee extensors induced by maximal eccentric exercise

Author:

Chen Trevor C.1ORCID,Chen Hsin‐Lian2,Tseng Wei‐Chin3,Chou Tai‐Ying14,Tu Jui‐Hung5,Parcell Allen C.6ORCID,Nosaka Kazunori7ORCID

Affiliation:

1. Department of Physical Education and Sport Sciences National Taiwan Normal University Taipei City Taiwan

2. Department of Physical Education, Health and Recreation National Chiayi University Chiayi County Taiwan

3. Department of Physical Education University of Taipei Taipei City Taiwan

4. Department of Athletic Performance National Taiwan Normal University Taipei City Taiwan

5. Department of Physical Education National Pingtung University Pingtung City Taiwan

6. Department of Exercise Sciences Brigham Young University Provo Utah USA

7. Centre for Human Performance, School of Medical and Health Sciences Edith Cowan University Joondalup Western Australia Australia

Abstract

AbstractThe present study compared the ipsilateral repeated bout effect (IL‐RBE) and contralateral repeated bout effect (CL‐RBE) of the elbow flexors (EF) and knee flexors (KF) for the same interval between bouts to shed light on their mechanisms. Fifty‐two healthy sedentary young (20–28 years) men were randomly assigned to the IL‐EF, IL‐KF, CL‐EF, and CL‐KF groups (n = 13/group). Thirty maximal eccentric contractions of the EF were performed in IL‐EF and CL‐EF, and 60 maximal eccentric contractions of the KF were performed in IL‐KF and CL‐KF, with a 2‐week interval between bouts. Changes in muscle damage markers such as maximal voluntary contraction (MVC) torque, muscle soreness, and plasma creatine kinase activity, and proprioception measures before to 5 days post‐exercise were compared between groups. Changes in all variables were greater (p < 0.05) after the first than second bout for all groups, and the changes were greater (p < 0.05) for the EF than KF. The changes in all variables after the second bout were greater (p < 0.05) for the CL than IL condition for both EF and KF. The magnitude of the average protective effect was similar between CL‐EF (33%) and CL‐KF (32%), but slightly greater (p < 0.05) for IL‐EF (67%) than IL‐KF (61%). These demonstrate that the magnitude of CL‐RBE relative to IL‐RBE was similar between the EF and KF (approximately 50%), regardless of the greater muscle damage for the EF than KF. It appears that the CL‐RBE is more associated with neural adaptations at cerebrum, cerebellum, interhemispheric inhibition, and coricospinal tract, but the IL‐RBE is induced by additional adaptations at muscles.

Funder

Ministry of Science and Technology, Taiwan

Publisher

Wiley

Subject

Physical Therapy, Sports Therapy and Rehabilitation,Orthopedics and Sports Medicine

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