The effect of simultaneous sub-maximal exercise with mental exertion on central fatigue indices in active men
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Authors
1master
2دانشگاه شهید بهشتی
3student
Abstract
Introduction: Mental fatigue is a psychobiological state caused by prolonged periods of demanding cognitive activity. Although the impact of mental fatigue on cognitive and skilled performance is well known, its effect on central fatigue has not been thoroughly investigated. The purpose of this study was to investigate the effect of simultaneous sub-maximal exercise with mental exertion on central fatigue indices in active men.
Methodology: In this randomized crossover study, fifteen active men with an average height of 176±9 cm, weight 71±10 kg and body fat 17±5 percent, 3 sessions visited from laboratory. The first session was measured maximal oxygen consumption. The subjects performed a 45 minutes physical exercise with intensity of 65% VO2max on treadmill in 2 occasions separated by an interval of at least 72 hours. The 45 minutes physical exercise was simultaneously with mental exertion (AX-CPT test; experimental trail) to induce mental fatigue or physical exercise solely (control). Prolactin, cortisol, maximal voluntary contraction (MVC) and root mean square (RMS) were measured before and after these treatments. Rating of perceived exertion (RPE) and heart rate (HR) were measured throughout the both sessions.
Results: There was no significant difference in prolactin and cortisol between conditions but prolactin and cortisol increased after both conditions. RPE and HR increased in throughout both sessions but no significant difference between two sessions and MVC and RMS decreased after both sessions but no significant differences between two sessions.
Discussion: Simultaneous sub-maximal exercise with mental exertion cannot negatively affect central fatigue indices. Probably, 45-min mental exertion (AX-CPT test) cannot induce mental fatigue.
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