Purpose:to investigate the Cross-Training effect, induced on ankle dorsiflexors (AD) by unilateral strength-training of the contralateral muscles, as transfer of peak torque (PT) and muscle work (MW) and their relative contributions to muscle performance.Methods:30 healthy volunteers were randomly assigned to a training or control group. The trained group sustained a 4-week maximal isokinetic training of the weaker AD at 90 and 45°/s. At both angular velocities, PT, MW and MW/PT ratio were measured from both legs at baseline and after intervention (trained group) or no-intervention (controls). The learning-effect was calculated and subtracted by PT and MW measures to obtain their net changes.Results:Net PT and MW increased in both the untrained and trained legs. PT and MW gains were larger in the untrained than trained AD (p<0.0005), with MW increasing more than PT at 45°/s (p=0.04). The MW/PT ratio improved bilaterally only in the trained group (p<0.05), depending on the angular velocity.Conclusions:The Cross-training effect occurred in AD muscles in terms of both PT and MW, with MW adding valuable information to PT-analysis in describing muscle performance. Moreover, the MW/PT ratio allowed estimating the contributions of these parameters to muscle capability and may represent a novel index in isokinetic testing. The greater improvements in the untrained than trained limb raises interesting clinical implications in asymmetric conditions.

Valutazione degli effetti dell'allenamento controlaterale sulla performance dei muscoli dorsiflessori della caviglia in soggetti sani / Pisanu, Francesco. - (2015 Feb 12).

Valutazione degli effetti dell'allenamento controlaterale sulla performance dei muscoli dorsiflessori della caviglia in soggetti sani

PISANU, Francesco
2015

Abstract

Purpose:to investigate the Cross-Training effect, induced on ankle dorsiflexors (AD) by unilateral strength-training of the contralateral muscles, as transfer of peak torque (PT) and muscle work (MW) and their relative contributions to muscle performance.Methods:30 healthy volunteers were randomly assigned to a training or control group. The trained group sustained a 4-week maximal isokinetic training of the weaker AD at 90 and 45°/s. At both angular velocities, PT, MW and MW/PT ratio were measured from both legs at baseline and after intervention (trained group) or no-intervention (controls). The learning-effect was calculated and subtracted by PT and MW measures to obtain their net changes.Results:Net PT and MW increased in both the untrained and trained legs. PT and MW gains were larger in the untrained than trained AD (p<0.0005), with MW increasing more than PT at 45°/s (p=0.04). The MW/PT ratio improved bilaterally only in the trained group (p<0.05), depending on the angular velocity.Conclusions:The Cross-training effect occurred in AD muscles in terms of both PT and MW, with MW adding valuable information to PT-analysis in describing muscle performance. Moreover, the MW/PT ratio allowed estimating the contributions of these parameters to muscle capability and may represent a novel index in isokinetic testing. The greater improvements in the untrained than trained limb raises interesting clinical implications in asymmetric conditions.
Cross-education; cross-training; prestazione muscolare; ankle dorsiflexors
Valutazione degli effetti dell'allenamento controlaterale sulla performance dei muscoli dorsiflessori della caviglia in soggetti sani / Pisanu, Francesco. - (2015 Feb 12).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/250552
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