Purpose The purpose of this study was to examine the sex-specific influence of expected exercise duration on the physiological responses to RPE-clamp exercise anchored to RPE 15 with participants being deceived into believing the RPE-clamp exercise would last for 20-, 30-, or 40-min, but all trials were 30-min. Methods Twelve males and 12 females completed a graded exercise test followed by randomly ordered RPE-clamp trials at RPE15 on the Borg 6–20 scale where subjects were deceived into expecting exercise to last for either 20-, 30-, or 40-min, but the actual duration for each trial was 30-min. Separate 2 (Sex [Male vs. Female]) × 3 (Deception [20-min, 30-min, 40-min]) × 11 (Time [0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 min]) mixed model analyses of variance (ANOVAs) with appropriate follow-up ANOVAs, and Bonferroni-corrected pairwise comparisons, were used to examine changes in volume of oxygen uptake (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="421_2024_5698_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="34" /> </InlineMediaObject> <EquationSource Format="TEX">$\dot{V}O_{2}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mover accent="true"> <mi>V</mi> <mo>˙</mo> </mover> <msub> <mi>O</mi> <mn>2</mn> </msub> </mrow> </math></EquationSource> </InlineEquation>), heart rate (HR), respiration rate (RR), power output, and muscle oxygen saturation (%SmO2). Results Females, but not males, demonstrated lower power outputs when expected duration was 40-min compared to 20-min after approximately half of the exercise bout. <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="421_2024_5698_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="34" /> </InlineMediaObject> <EquationSource Format="TEX">$\dot{V}O_{2}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mover accent="true"> <mi>V</mi> <mo>˙</mo> </mover> <msub> <mi>O</mi> <mn>2</mn> </msub> </mrow> </math></EquationSource> </InlineEquation>, regardless of Sex, was also lower when expected duration was 40-min (62.47 ± 5.59% <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="421_2024_5698_Article_IEq3.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="58" /> </InlineMediaObject> <EquationSource Format="TEX">$\dot{V}O_{2\max }$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mover accent="true"> <mi>V</mi> <mo>˙</mo> </mover> <msub> <mi>O</mi> <mrow> <mn>2</mn> <mo movablelimits="true">max</mo> </mrow> </msub> </mrow> </math></EquationSource> </InlineEquation>) compared to 20-min (66.35 ± 5.79% <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="421_2024_5698_Article_IEq3.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="58" /> </InlineMediaObject> <EquationSource Format="TEX">$\dot{V}O_{2\max }$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mover accent="true"> <mi>V</mi> <mo>˙</mo> </mover> <msub> <mi>O</mi> <mrow> <mn>2</mn> <mo movablelimits="true">max</mo> </mrow> </msub> </mrow> </math></EquationSource> </InlineEquation>). There was no effect of expected duration on HR, RR, or %SmO2, but females demonstrated significantly higher HR (86.06 ± 5.93%HRmax) and RR (74.81 ± 7.26%RRmax) compared to males (79.52 ± 4.96%HRmax; 62.31 ± 5.80%RRmax). Conclusions RPE-clamp exercise performance in females, but not males, may be influenced by the expectation of exercise duration.

Influence of deception of task duration on the sex-specific physiological responses to RPE-clamp cycle ergometry

期刊论文
发表日期：

2025年1月7日

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Pasquale J. Succi,
Brian Benitez,
Minyoung Kwak,
Clara J. Mitchinson,
Timothy A. Butterfield,
Michael A. Samaan,
Jody L. Clasey,
Haley C. Bergstrom

摘要

Purpose

The purpose of this study was to examine the sex-specific influence of expected exercise duration on the physiological responses to RPE-clamp exercise anchored to RPE 15 with participants being deceived into believing the RPE-clamp exercise would last for 20-, 30-, or 40-min, but all trials were 30-min.

Methods

Twelve males and 12 females completed a graded exercise test followed by randomly ordered RPE-clamp trials at RPE15 on the Borg 6–20 scale where subjects were deceived into expecting exercise to last for either 20-, 30-, or 40-min, but the actual duration for each trial was 30-min. Separate 2 (Sex [Male vs. Female]) × 3 (Deception [20-min, 30-min, 40-min]) × 11 (Time [0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 min]) mixed model analyses of variance (ANOVAs) with appropriate follow-up ANOVAs, and Bonferroni-corrected pairwise comparisons, were used to examine changes in volume of oxygen uptake ( $\dot{V}O_{2}$ $\dot{V} O_{2}$ ), heart rate (HR), respiration rate (RR), power output, and muscle oxygen saturation (%SmO₂).

Results

Females, but not males, demonstrated lower power outputs when expected duration was 40-min compared to 20-min after approximately half of the exercise bout. $\dot{V}O_{2}$ $\dot{V} O_{2}$ , regardless of Sex, was also lower when expected duration was 40-min (62.47 ± 5.59% $\dot{V}O_{2\max }$ $\dot{V} O_{2 max}$ ) compared to 20-min (66.35 ± 5.79% $\dot{V}O_{2\max }$ $\dot{V} O_{2 max}$ ). There was no effect of expected duration on HR, RR, or %SmO₂, but females demonstrated significantly higher HR (86.06 ± 5.93%HR_max) and RR (74.81 ± 7.26%RR_max) compared to males (79.52 ± 4.96%HR_max; 62.31 ± 5.80%RR_max).

Conclusions

RPE-clamp exercise performance in females, but not males, may be influenced by the expectation of exercise duration.