Having the Heart to Exercise Control: Cardiac Interoception Influences Self-Paced Exercise Regulation

J. B. Butterworth, J. Dekerle, A. Greenhouse-Tucknott, H. D. Critchley, N. J. Smeeton
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Abstract

The aim of this study was to examine the role of cardiac interoception on self-regulated (Experiment 1) and externally prescribed (Experiment 2) exercises. Cardiac interoception was assessed using heartbeat tracking and discrimination tasks in both experiments. Based on heartbeat discrimination performance, participants were partitioned into groups demonstrating GOOD and POOR cardiac interoceptive accuracy. In Experiment 1, 20 participants completed two self-regulated 20-min cycling tasks at two intensities (light rated physical exertion [RPE on Borg Scale = 10] vs. hard-to-very hard, RPE = 16). During self-regulated exercise, the POOR cardiac interoception group showed lower differences in their exercise work rates and physiological responses between light and hard-to-very hard intensity exercises. These differences were partly attributable to a higher work rate over the first 5 min of light intensity exercise and a higher initial rate of work in the first min of hard-to-very hard intensity exercise. In Experiment 2, 15 participants completed an externally prescribed, constant-load cycling task performed at 80% of the peak power output, to task failure. During externally prescribed exercise, GOOD and POOR groups did not differ in their time-to-task failure nor in their physiological and perceptual responses to the exercise. Together these findings demonstrate that individual differences in interoceptive accuracy influence the regulation of self-paced exercise but do not affect externally prescribed exercise tolerance under constant load.

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有心脏运动控制:心脏内感受影响自我节奏运动调节
本研究的目的是探讨心脏内感受在自我调节(实验1)和外部规定(实验2)运动中的作用。在两个实验中,使用心跳跟踪和辨别任务来评估心脏内感受。根据心跳辨别的表现,参与者被分为心脏内感受准确度好的和差的两组。在实验1中,20名参与者在两种强度下完成了两项自我调节的20分钟骑行任务(轻度体力消耗[博格量表RPE = 10]与困难至非常困难,RPE = 16)。在自我调节运动中,POOR心脏内感受组在轻强度运动和高强度运动之间的运动工作率和生理反应差异较小。这些差异的部分原因是,在低强度运动的前5分钟,他们的工作速率更高,而在高强度到非常高强度运动的前5分钟,他们的工作速率更高。在实验2中,15名参与者完成了外部规定的恒负载循环任务,在80%的峰值功率输出下执行任务,直到任务失败。在外部规定的运动中,好组和差组在完成任务的时间失败以及对运动的生理和感知反应方面没有差异。综上所述,这些发现表明,在恒定负荷下,内感受准确性的个体差异会影响自我节奏运动的调节,但不会影响外部规定的运动耐受性。
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