title: Characterization of ankle dorsiflexors performance in healthy subjects following maximal-intensity isokinetic resistance training.
abstract: 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.
authors.affiliation: Department of Biomedical Sciences, University of Sassari, Viale San Pietro 43/c, 07100 Sassari, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Manca
authors.affiliation: Department of Biomedical Sciences, University of Sassari, Viale San Pietro 43/c, 07100 Sassari, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Solinas
authors.affiliation: Department of Biomedical Sciences, University of Sassari, Viale San Pietro 43/c, 07100 Sassari, Italy.
authors.forename: D
authors.initials: D
authors.lastname: Dragone
authors.affiliation: Department of Biomedical Sciences, University of Sassari, Viale San Pietro 43/c, 07100 Sassari, Italy; Department of Physical Therapy, Sackler Faculty of Medicine, Tel Aviv University, Ramat Aviv 69978, Israel.
authors.forename: Z
authors.initials: Z
authors.lastname: Dvir
authors.affiliation: Department of Biomedical Sciences, University of Sassari, Viale San Pietro 43/c, 07100 Sassari, Italy. Electronic address: deriuf@uniss.it.
authors.forename: F
authors.initials: F
authors.lastname: Deriu
mesh_terms: D000328:Adult; D000842:Ankle / Q000502:physiology*; D000843:Ankle Joint / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D011897:Random Allocation; D016059:Range of Motion, Articular; D055070:Resistance Training
keywords: Isokinetic parameters; Muscle strength; Resistance exercise