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European Journal of Applied Physiology

, Volume 112, Issue 4, pp 1587–1592 | Cite as

Similar increases in muscle size and strength in young men after training with maximal shortening or lengthening contractions when matched for total work

  • Daniel R. MooreEmail author
  • Mark Young
  • Stuart M. Phillips
Short Communication

Abstract

Training exclusively with eccentric (lengthening) contractions can result in greater muscular adaptations than training with concentric (shortening) contractions. We aimed to determine whether training-induced increases in muscle size and strength differed between muscles performing maximal lengthening (LC) or maximal shortening (SC) contractions when total external work is equivalent. Nine healthy young males completed a 9-week isokinetic (0.79 rad/s) resistance training program of the elbow flexors whereby they performed LC with one arm and an equivalent volume of total external work with the contralateral arm as SC. Training increased isometric peak torque for both LC (~10%) and SC (~20%) with no difference (P = 0.14) between conditions. There were also similar increases in isokinetic peak torque at both slow (0.79 rad/s) and fast (5.24 rad/s) shortening and lengthening peak torque for both LC (~8–10%) and SC (~9–20%). Training increased work per repetition similarly for both LC (~17%) and SC (~22%), in spite of ~40% greater work per repetition with LC. The increase in muscle cross-sectional area with training was also similar (P = 0.37) between LC (~6.5%) and SC (~4.6%). We conclude that increases in muscle size and strength with short-term unilateral resistance training are unrelated to muscle contraction type when matched for both exercise intensity (i.e. maximal contractions) and total external work.

Keywords

Eccentric Muscle Hypertrophy Strength Training Muscle damage 

Notes

Acknowledgments

We would like to thank the participants for their time and effort during the study. DRM was supported by a Canadian Institutes of Health Research Canada Graduate Scholarship. Funding for the study was provided by a Natural Sciences and Engineering Research Council of Canada research grant awarded to SMP.

Conflicts of interest

These authors have no conflicts of interest to declare.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Daniel R. Moore
    • 1
    Email author
  • Mark Young
    • 1
  • Stuart M. Phillips
    • 1
  1. 1.Exercise Metabolism Research Group, Department of KinesiologyMcMaster UniversityHamiltonCanada

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