Fluctuating dynamics of perceived exertion in constant-power exercise

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• 作者：Daniel Aragon茅s ; Nat脿lia Balagu茅 ; Robert Hristovski ; Rafel Pol ; Gershon Tenenbaum
• 关键词：Perceived effort ; Fluctuation dynamics ; Constant-power cycling ; Volitional exhaustion
• 刊名：Psychology of Sport and Exercise
• 出版年：November, 2013
• 年：2013
• 卷：14
• 期：6
• 页码：796-803
• 全文大小：715 K

文摘

Objectives

To reveal and study the fluctuating dynamics of perceived exertion (PE) during constant-power exercise performed under different conditions (duration, intensity, and termination).

Design

A pilot and two subsequent experimental studies were performed. The studies consisted of manipulating workload and measuring fluctuating perceived exertion dynamics throughout the cycling task.

Methods

In a pilot study Borg's rating of perceived exertion (RPE) was measured every 15聽s in 2 groups of 9 participants each (using RPE 6-20 and CR10 scales, respectively) cycling at heavy intensity until volitional exhaustion. The percentage of participants alternating increased and decreased RPE values (fluctuating dynamics) was calculated. In 2 subsequent experiments PE changes (increase/decrease perceptions) were reported when occurring in 2 groups of 13 participants cycling at a moderate intensity for 30 and 60聽min, respectively (Experiment 1), and in another group of 12 participants cycling at heavy intensity until volitional exhaustion (Experiment 2). The individual time series of 鈥渋ncrease鈥?鈥渄ecrease鈥?reports were divided into 5 non-overlapping temporal windows, and the percentages of 鈥淧E increase鈥?were calculated for each window.

Results

In the pilot study 66.6% (RPE 6-20 group) and 33.3% (CR10 group) of the participants showed an RPE fluctuating dynamics during the exercise. However, all participants showed a clear PE fluctuating dynamics during the moderate and heavy intensity exercises performed in Experiment 1 and Experiment 2, respectively. Nevertheless, a transition towards a PE non-fluctuating dynamics (dominated by 鈥淧E increase鈥?reports) was noticed in Experiment 2 while approaching volitional exhaustion.

Conclusions

PE seems to have a dominant fluctuating dynamics during constant-power cycling performed under different conditions (duration, intensity, and termination) that changes towards a non-fluctuating dynamics when approaching the volitional exhaustion point.