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Pacing strategies during repeated maximal voluntary contractions

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Abstract

Purpose

Pacing strategies have been reported to occur during continuous cyclical exercises. However, currently no studies have examined if pacing takes place during repeated maximal voluntary muscle contractions (MVCs). Accordingly, the purpose of this study was to examine if informing subjects on the number of MVCs they would perform would affect force and root mean squared electromyography (EMG), during similar fatiguing protocols.

Methods

Thirty well-trained male subjects completed three fatiguing protocols in a randomized order. In the control condition participants were informed they would perform 12 MVCs, and then completed all 12. In the unknown condition they were not told how many MVCs they would perform, but were stopped after 12. Lastly, in the deception condition they were initially told they would perform only 6 MVCs, but after the 6 contractions they were asked to perform a few more repetitions and were stopped after 12.

Results

Compared to the unknown condition, subjects demonstrated greater forces (p < 0.05, ES = 0.35–1.14, 2–7.5 %) and biceps EMG (p < 0.05, ES = 0.6, 6 %) in the deception condition during the first six MVCs. Additionally, under all conditions subjects applied greater forces in the last repetition (#12) relative to the previous one (#11) (p < 0.06, ES = 0.36–0.5, 2.8–3.8 %).

Conclusions

The anticipation of performing a certain number of MVCs led the subjects to utilize different pacing strategies. The results also question the assumption that subjects followed the instruction to exert maximal effort during repeated MVCs.

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Abbreviations

ANOVA:

Analysis of variance

EMG:

Electromyography

ES:

Effect size

Hz:

Hertz

ICC:

Intraclass correlation coefficient

MVC:

Maximal voluntary contraction

RMS:

Root mean square

SD:

Standard deviation

VO2 :

Volume of oxygen (measure of aerobic capacity)

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Correspondence to D. G. Behm.

Additional information

Communicated by Nicolas Place.

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Halperin, I., Aboodarda, S.J., Basset, F.A. et al. Pacing strategies during repeated maximal voluntary contractions. Eur J Appl Physiol 114, 1413–1420 (2014). https://doi.org/10.1007/s00421-014-2872-3

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  • DOI: https://doi.org/10.1007/s00421-014-2872-3

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