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Indexed/Abstracted in: BIOSIS Previews, EMBASE, Scopus, Emerging Sources Citation Index
Online ISSN 1827-1812
Nygaard H., Rønnestad B. R.
Faculty of Human, Sports and Social Sciences, Lillehammer University College, Lillehammer, Norway
Aim. The purpose of this study was to compare the acute effects of superimposed vibration of different frequencies on 1RM performance in the elbow extensors in untrained and recreational strength trained individuals.
Methods. Eleven untrained (≤1 strength training session a week during the previous 6 months) and 10 recreationally strength trained (2-3 sessions of strength training a week during the previous 6 months) subjects participated in the study. The untrained and the recreationally strength trained group were randomly exposed to 30 Hz and 50 Hz of superimposed vibration or control conditions with no vibration, during 1RM tests in triceps pushdown. The vibration with amplitude of 2.5 mm was transmitted through the handle of the training device to the arm muscles.
Results. As a result of 50 Hz of vibration, the untrained group attained an increase in 1RM by 4.9% (P=0.013) and 4.5% (P=0.014) compared to no vibration and 30 Hz of vibration, respectively. No significant differences between the test conditions were observed in the recreationally strength trained group.
Conclusion. We conclude that untrained individuals acutely increase their maximal force in the elbow extensors by adding 50 Hz of vibration, while no acute increase was observed in recreational strength trained individuals.