Characterization of ankle dorsiflexors performance in healthy subjects following maximal-intensity isokinetic resistance training

J Electromyogr Kinesiol. 2015 Oct;25(5):773-81. doi: 10.1016/j.jelekin.2015.06.002. Epub 2015 Jun 17.


The purpose of this randomized trial was to examine, in healthy subjects, the effect of unilateral isokinetic-concentric training of the dominant ankle dorsiflexors (DF) on the peak moment (PM), mean PM (MPM), maximal work and mean work (meanW). Thirty volunteers (26.7±4.6years old) underwent bilateral isokinetic testing of ankle DF at 45 and 90°/s. Participants were randomly assigned to a control or a training group. The training lasted 4weeks (4-day/week). All dynamometric parameters increased significantly only in the training group for the trained leg (p<0.05), with greater gains in work (32-47% at 45°/s and 31-41% at 90°/s) than moment variables (14-18% at 45°/s and 14-28% at 90°/s). Similar increases in strength were also noted at both angular velocities in the untrained leg (p<0.01) for both work and moment parameters, depicting a cross-training effect. Correlations between 'moments' and 'works' increased in both legs after training from 0.59-0.77 to 0.79-0.95. Principal component analysis indicated that, at baseline, PM showed the highest weight on DF performance; after training, meanW at 90°/s and MPM at 45°/s exhibited the highest loadings. High-intensity training of ankle DF increase the ability in generating energy throughout the entire range of motion rather than maximizing the PM.

Keywords: Isokinetic parameters; Muscle strength; Resistance exercise.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Ankle / physiology*
  • Ankle Joint / physiology
  • Female
  • Humans
  • Male
  • Muscle, Skeletal / physiology*
  • Random Allocation
  • Range of Motion, Articular
  • Resistance Training*