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Association between interindividual variability in training volume and strength gain.

Ryoichi Ema1, Itaru Saito2, Ryota Akagi2,3

  • 1Faculty of Sport Science, Shizuoka Sangyo University Owara, Iwata-shi, Japan.

Frontiers in Physiology
|October 13, 2022
PubMed
Summary

Training volume significantly impacts strength gains in low responders, with higher volumes leading to greater maximal voluntary contraction torque improvements. High responders showed no such association.

Keywords:
high respondership flexionisometric trainingknee extensionlow respondersmaximal voluntary contraction

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Area of Science:

  • Exercise Physiology
  • Muscle Adaptation

Background:

  • Interindividual variability in strength adaptations to training is common.
  • Understanding factors influencing these variations is crucial for optimizing training programs.

Purpose of the Study:

  • To investigate the relationship between training volume and changes in maximal voluntary contraction (MVC) torque.
  • To identify differences in this association between high and low responders to strength training.

Main Methods:

  • 26 untrained men underwent 4 weeks of isometric knee extension or hip flexion training.
  • Training involved four sets of ten 3-second contractions.
  • Training volume (impulse) and MVC torque were measured; participants categorized as high or low responders based on MVC changes.

Main Results:

  • No significant differences in MVC torque changes or total training volume between high and low responders.
  • Low responders exhibited higher training volumes compared to high responders.
  • A significant positive association between training volume and MVC torque changes was found in low responders (r=0.869, p<0.001), but not in high responders (r=0.229, p=0.451).

Conclusions:

  • Training volume is a key determinant of strength gains, particularly in low responders.
  • The study protocol yielded approximately 20% improvement in MVC torque irrespective of the joint action trained.