Conclusions
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1.
When a group of muscles is working and another group is set in action there is an immediate increase in the height of contractions of the first group.
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2.
At the finish of a race a vigorous arm action facilitates the leg action.
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3.
Squeezing corks or clenching the fists at the end of a race is a helpful device, but is not particularly efficient. A vigorous arm swinging has a greater effect upon the legs.
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4.
Cheering has a more powerful effect upon the leg contraction than swinging the arms. Yet, in actual competition contestants become relatively deaf and may not be cognizant of such cheering.
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5.
Excitable athletes under the stress of competition may involuntarily accelerate their pace to excess, thus losing their chance to win a long race.
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Karpovich, P.V. Physiological and psychological dynamogenic factors in exercise. Arbeitsphysiologie 9, 626–629 (1937). https://doi.org/10.1007/BF02009877
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DOI: https://doi.org/10.1007/BF02009877