Abstract
Time to task failure of the contralateral untrained limb after high load-low repetition eccentric and low load-high repetition resistance training
Highlights
Cross-training is the process whereby training of one limb gives rise to enhancements in the performance of the opposite, untrained limb and may be dependent on type of muscle contractions performed
Percent increase in time to task failure depend on training mode with a larger increase identified for eccentric group compared to concentric group (P < 0.05) Figure 2
Percent increase in EMG Average rectified value (ARV) depend on training mode with a larger increase identified for eccentric group compared to concentric group (P < 0.05)
Summary
Aims: Cross-training is the process whereby training of one limb gives rise to enhancements in the performance of the opposite, untrained limb and may be dependent on type of muscle contractions performed. Since greater maximum muscle force and neural activity can be developed during maximal eccentric exercise compared to concentric exercise, heavy-resistance training using eccentric muscle actions may be most effective for increasing muscle ability to maintain a submaximal force. These adaptations may be transferred to the opposite homologous limb as evidenced by neural plasticity of motor pathways projecting to the contralateral untrained limb and or/trained limb[21,22]. The purpose of this study was to compare time to task failure in homologous muscle of the opposite limb after 12 weeks of unilateral eccentric and concentric exercise training. Surface electromyography signals (EMG) were recorded from the contralateral untrained quadriceps muscles during submaximal contraction sustained at 50% of maximal voluntary contraction (MVC) until task failure
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