Abstract
The purpose of this study was to determine whether cross-education, defined as the increase in strength of an untrained limb after training of the contralateral homologous limb, is specific to low and high velocity eccentric training. Twenty-six subjects were randomized into two groups (n=13 each) that performed unilateral eccentric training of the elbow flexors on an isokinetic dynamometer at velocities of either 30° s-1 (0.52 rad s-1) or 180° s-1 (3.14 rad s-1 ). Subjects trained three times per week for 8 weeks. Ten subjects served as controls and did not train. Subjects were tested before and after training for peak torque of the elbow flexors during eccentric and concentric contractions at 30° s-1 and 180° s-1 . Eccentric peak torque at the velocity of 180° s-1 in the untrained arm increased only for the group that trained at that velocity (P<0.05). There were no other changes in untrained arms for any of the groups at velocities of 30° s-1 or 180° s-1. For the trained arm, the increase in eccentric torque (pooled over velocities) was greatest for the group training at 180° s-1, whereas the increase in concentric torque was similar for the groups training at 30° s-1 and 180° s-1. For the trained arm, there was no specificity for velocity or contraction type. We conclude that cross-education was specific to contraction type and velocity when fast (but not slow) eccentric contractions were used during training; whereas there was no specificity of training in the trained arm.
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Acknowledgments
We gratefully acknowledge the subjects who dedicated a large amount of time to participate in this study. We also acknowledge the technical assistance of Doug Jacobson. Jon Farthing is supported by a scholarship from the Natural Sciences and Engineering Research Council of Canada. The experiments described in this paper comply with the current laws of Canada.
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Farthing, J.P., Chilibeck, P.D. The effect of eccentric training at different velocities on cross-education. Eur J Appl Physiol 89, 570–577 (2003). https://doi.org/10.1007/s00421-003-0841-3
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DOI: https://doi.org/10.1007/s00421-003-0841-3