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NJBMS - Volume 6, Issue 3, January - March 2016

Pages: 100-105
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STUDY OF AUDIOVISUAL REACTION TIME AND CRITICAL FUSION

FREQUENCY IN DIFFERENT PHASES OF MENSTRUAL CYCLE

Author: MILIND V BHUTKAR, L. APARNA

Category: Physiology

Abstract:

Background : Reaction time (RT) is the correct and timely response to the stimulus. Reaction time is an indirect index of processing capabilities of the central nervous system. Critical fusion frequency (CFF) is the frequency at which an intermittent light stimulus appears to be completely steady to the observer. Measurement of CFF is used as a test for fatigue of the central nervous system, cortical processing capacity and level of cortical activity or arousal in a person.

Aims and Objectives: To find out changes in auditory and visual reaction time and critical fusion frequency in various phases of menstrual cycle.

Material and Methods: Present study was conducted on thirty healthy, regularly menstruating female subjects in the age group of 18-25 years. The procedure was explained and three practice trials were given every time before recording reaction time and CFF. In each subject, audiovisual reaction time and CFF recording was done on 1st or 2nd day of menstruation and referred to as menstrual phase, middle of proliferative phase (10th –12th day) and middle of secretory phase (21st –23rd day) of menstrual cycle. The procedure was explained and three practice trials were given every time before recording reaction time and CFF.

Statistical analysis : ANOVA was applied for statistical analysis. The outcomes were presented as a mean ±SD and 'p' value of less than 0.05 was considered as significant. Correlation of CFF with visual and auditory reaction time was found out by coefficient of correlation.

Results and Conclusion: Our study indicates that there is no statistically significant difference in auditory reaction time (ART), visual reaction time (VRT) and critical fusion frequency (CFF) in different phases of menstrual cycle .There was a very weak positive correlation (as the VRT and ART increases the CFF also increases) between the CFF with VRT and ART. Hence, phase of menstrual cycle is unlikely to affect significantly the parameters of electrophysiological studies or athletic training in females.

Keywords: Audiovisual reaction time, critical fusion frequency, phases of menstrual cycle