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No effect of short term cross-education training on concentric contralateral shoulder strength
Journal article   Peer reviewed

No effect of short term cross-education training on concentric contralateral shoulder strength

Tyler J. Neltner, Cameron D. Addie, Ludmila M. Cosio-Lima, Chris C. Dake and Lee E. Brown
Isokinetics and exercise science, Vol.27(4), pp.261-266
01/01/2019
DOI: https://doi.org/10.3233/IES-192172
Web of Science ID: WOS:000499719100003

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Abstract

BACKGROUND: The ability to train unilaterally and experience contralateral strength gains, a phenomenon known as cross-education, has been well documented in the lower extremity but not the upper. Additionally, short-term training of one to two weeks has shown neural adaptations in strength. OBJECTIVE: To examine the effects of a short-term cross-education strength-training program on contralateral shoulder strength. METHODS: Twenty-seven healthy college students (age: 21.37 +/- 2.02 years; height: 167.85 +/- 7.63 cm; mass: 74.42 +/- 16.73 kg) were randomly assigned to either an experimental (n = 13) or control group (n = 14). All participants completed a pre and post-test separated by two weeks. Testing consisted of 6 maximal repetitions of shoulder internal/external rotation, at each of three speeds (60 and 180 degrees/s). The experimental group underwent right arm unilateral training (3 x 10 repetitions at all 3 speeds) two times a week for the next two weeks on the same dynamometer. Control group did not train. RESULTS: A 2 x 2x 2x 2 (time x arm x speed x group) ANOVA revealed no significant interactions by group, however there main effects of time and arm. For internal rotation, peak moment was significantly greater in the right arm and at 60 degrees/s, and average power was significantly greater in the right arm and at 180 degrees/s. For external rotation; peak moment, average power and total work, were significantly greater in the right arm and at 60 degrees/s. CONCLUSIONS: Short-term cross education training showed no increase in contralateral shoulder strength. Therefore, short-term cross education strength training should not be considered a useful tool in shoulder rehabilitation at this time. However, future research should investigate contrasting training programs.

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