Key result
Muscle-spindle stimulation during static exercise significantly reduced perceived exertion but did not significantly alter prefrontal cortex oxygenation compared to exercise without stimulation.
Why the study?
Does muscle-spindle stimulation during static exercise reduce perceived exertion without altering prefrontal cortex activation in healthy females?
Does muscle-spindle stimulation during static exercise reduce perceived exertion without altering prefrontal cortex activation in healthy females?
Perceived exertion during exercise is not necessarily associated with prefrontal cortex activation, suggesting that the sensation of physical fatigue may be transmitted to the sensory cortex rather than the prefrontal cortex.
Answers are grounded in this paper and cite their sources.
Muscle-spindle stimulation may modulate perceived exertion independently of prefrontal oxygenation; leaves open sensory cortex mediation of fatigue and requires confirmation.
Previous studies have investigated the relationship between prefrontal cortex activation and perceived exertion during prolonged exercise. However, the effect of perceived exertion on prefrontal cortex activity is confounded by exercise intensity. Therefore, the changes in prefrontal cortex activity in response to perceived exertion remain unclear. The purpose of the present study was to investigate the relationship between the activation (oxygenation) of the prefrontal cortex and perceived exertion during constant work-rate elbow-flexion exercise with or without muscle-spindle stimulation. Ten healthy, right-handed subjects participated in the study. Near-infrared spectroscopy with probes positioned over the prefrontal cortex measured its activation throughout elbow-flexion exercise. Subjects performed sustained elbow-flexion exercise at 25-35% of the maximal voluntary contraction (MVC) with or without muscle-spindle stimulation (vibration), which can decrease perceived exertion. The ratings of perceived exertion were significantly lower during exercise with vibration (Ex-Vib) than during exercise without vibration (Ex) (p<0.05). The oxygenation of the prefrontal cortex during Ex-Vib did not significantly differ from that during Ex (p>0.05). These results indicated that perceived exertion was not necessarily associated with prefrontal cortex activation during exercise.
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Shibuya et al. (2009) studied Healthy subjects (n=10). Muscle-spindle stimulation (vibration) during exercise vs. Exercise without vibration was evaluated on Prefrontal cortex oxygenation ([HbO2]) (p=>0.05). Muscle-spindle stimulation during static exercise significantly reduced perceived exertion but did not significantly alter prefrontal cortex oxygenation compared to exercise without stimulation.
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