Abstract
The mechanism behind exercise-induced fatigue is a significant topic in the field of sports physiology. Therefore, establishing and evaluating an acute exercise-induced fatigue animal model that explores the limits of the motor system may provide greater insight into these mechanisms. Heart rate is an important quantitative parameter that accurately reflects the immediate change in physical function due to exercise load. And there is likely to be an important correlation between heart rate and behavioral performance. In this study, changes in heart rate and behavioral indexes during exercise-induced fatigue were quantitatively analyzed in rats using heart rate telemetry and video methods respectively. The behavioral indexes were used as independent variables and the degree of fatigue was used as the forecast value. Ternary quadratic function curve fitting was used to deduce a formula to calculate a fatigue score: Y = 15.2548+0.4346∙xa-0.1154∙xb+0.6826∙xc+0.0044∙xa∙xb-0.0021∙xb∙xc-0.0013∙xc∙xa-0.0023∙xa2-0.0016∙xb2 (r2=0.906). It identified a linear relationship between heart rate and exercise intensity, with a plateau in heart rate occurring during difference periods. It will serve as an effective reference for the modeling of exercise-induced fatigue. In addition, it also provides a theoretical method for analyzing the correlation between peripheral and central parameters.
Highlights
Exercise-induced fatigue is a common phenomenon in athletics and a key factor that restricts an athlete’s performance level (Knuttgen 1983)
Since the exercise-induced fatigue time varied among rats, we divided the duration of exerciseinduced fatigue into 15 time periods to facilitate statistical analysis
An accurate model might indicate how the motor system deteriorates during sustained activity, and how the central nervous system (CNS) might cope with this reduction in motor performance during exercise-induced fatigue (Rodrigues et al 2009)
Summary
Exercise-induced fatigue is a common phenomenon in athletics and a key factor that restricts an athlete’s performance level (Knuttgen 1983). It is presumed that exercise-induced fatigue occurs due to changes in the electrical activities of neurons in the cerebral cortex and basal ganglia. The degree of exercise-induced fatigue was evaluated by observing the running distance and posture of rats, which are not fully quantitative parameters. Heart rate is an important quantitative parameter that accurately reflects the immediate change in physical function due to exercise load. Behavioral indexes, such as running distance and posture, may reflect the overall condition of experimental animals (Kruk 1997). There is likely to be an important correlation between heart rate and behavioral performance
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