Running economy and metabolic responses following exercise- induced muscle damage at two different velocities

Document Type : Original Article

Authors

1 Islamic Azad University, Sepidan Branch, Physical Education and Sport Sciences, Department, Sepidan, Fars, Iran.

2 Ardakan University, Faculty of Humanities and Social Sciences, Sport Sciences Department, Ardakan, Yazd, Iran.

Abstract

Eccentric contractions predispose muscles to damage. Type II muscle fibers are more susceptible than type I, so it seems that contraction velocity interferes in mechanical stress and thus muscle damage. The purpose of this study was to investigate the effect of contraction velocity of acute dominant knee extensor eccentric exercise-induced muscle damage (EIMD) on running economy and metabolic responses in trained young females. Twenty-one trained young females were randomly assigned into two groups: high-velocity contraction eccentric exercise (240°s-1) and low-velocity (60°s-1). To induce muscle damage subjects, in high and low-velocity groups performed 20 and 5 sets of 15 repetitions, respectively, with a load equal to 150٪ of the maximal voluntary isometric contraction (MVIC) torque of knee extensors with a dominant limb. Then; MVIC of knee extensors was recorded before, one and 48 h after EIMD, and running economy (submaximal Steady-state vo2), and metabolic responses were recorded at 60, 70, and 80% of pre-determined vVO2max, 24 h before and 48 h after EIMD. Both exercise bouts resulted in significant changes in MVIC of knee extensor (p<0.05) with no significant difference between the two groups. No significant difference was found in running economy and metabolic responses in three different intensities following both exercise conditions between the two groups. Results of the analysis showed that a four-fold difference in contraction velocity of eccentric exercise-induced muscle damage was not sufficient to induce a difference in muscle damage, running economy, and metabolic responses when the knee extensor muscle tension duration was equalized.

What is already known on this subject?

All the studies conducted in the field of the effect of EIMD velocity have been focused on the flexor muscles of the elbow and upper limb and most of them have been conducted in male subjects with an unequal duration of tension. In addition, the effect of EIMD on the running economy following different velocities of eccentric training is not well known, and due to the focus of research on one muscle group, the difference in the EIMD protocol, intensity, velocity and duration, the results are contradictory, and it is not possible to comment with certainty about the effect of contraction velocity.

 

What this study adds?

The present study was the first research that has investigated the effect of contraction velocity of the EIMD of quadriceps muscle with equal tension time on running economy and metabolic factors. In addition, the results showed that running economy and metabolic responses in trained young females are not influenced by contraction velocity of acute eccentric EIMD Up to 48 hours after injurious activity. 

Keywords

Main Subjects


Acknowledgements

This article is extracted from a doctoral dissertation. The authors would like to thank Dr Bahar Shaghayegh Fard for her help in data collection in the sports biomechanics laboratory.

Funding

The study was supported in part by a Kharazmi university.

Compliance with ethical standards

Conflict of interest The authors declare that they have no conflict of interest.

Ethical approval Experimental protocols were approved (IR.SUMS.REC.1395.146) by the Ethics Committee of Shiraz University of Medical Sciences. Written informed consent was obtained from all participants.

Informed consent Written informed consent for publication was obtained from all participants.

Author contributions

Conceptualization: F.M., Z.H.F.; Methodology: .M., Z.H.F.; Software: F.M.; Validation: Z.H.F.; Formal analysis: .M., Z.H.F.; Investigation: .M., Z.H.F.; Resources: .M., Z.H.F.; Data curation: M., Z.H.F.; Writing - original draft: F.M.; Writing - review & editing: Z.H.F.; Visualization: .M., Z.H.F.; Supervision: F.M.; Project administration: Z.H.F.; Funding acquisition: F.M.

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