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Paper Information

Journal:   RAZI JOURNAL OF MEDICAL SCIENCES (JOURNAL OF IRAN UNIVERSITY OF MEDICAL SCIENCES)   SUMMER 2003 , Volume 10 , Number 34; Page(s) 309 To 316.
 
Paper: 

EFFECT OF FLUCTUATIONS OF VERBAL COMMAND VOLUME ON MAGNITUDE OF MUSCLE CONTRACTION

 
 
Author(s):  NOURIZADEH DEHKORDI SH.*, SARAEIPOUR S., KARIMI SABEREH
 
* SCHOOL OF REHABILITATION, MOHSENI SQ, SHAH NAZARI AVE, IRAN UNIVERSITY OF MEDICAL SCIENCES AND HEALTH SERVICES, TEHRAN, IRAN
 
Abstract: 

Loudness of verbal commands affects the Voluntary motor response. It seems the more intensity of verbal command, the more muscle contraction force. The purpose of this study was to investigate the hypothesized effect of verbal command loundness onmagnitude of a resulting voluntary isometric contraction of triceps brachi muscle. Thirty five female subjects between ages of 18-30 performed four isometric contractions of the right triceps branchi muscle in response to fluctuations of verbal command in four stages with one-minute rest between stages. The muscle contraction force was measured at each stage by digital dynamometer. The intensity of verbal commands in four stages was 66, 88, 66, 88 decibels, respectively. Statistical analysis showed that increasing voice volume between first and second stage increased the muscle isometric force significantly (P<0.05) and decreasing voice volume approximately 22 db between second and third stage had significant effect on muscle force. But increasing voice volume between third stages did not have any significant effect on muscle force. Therefore the verbal command repetitions caused decrease of the primary effect.

 
Keyword(s): ACOUSTIC STIMULATION, MUSCLE CONTRACTION, EXERCISETHERAPY, VERBAL COMMAND
 
References: 
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