Responses to Exercise at the Critical Heart Rate vs. the Power Output Associated With the Critical Heart Rate

Succi, Pasquale J.; Dinyer-McNeely, Taylor K.; Voskuil, Caleb C.; Abel, Mark G.; Clasey, Jody L.; Bergstrom, Haley C.

doi:10.1519/jsc.0000000000004547

Cited by 2 publications

(16 citation statements)

References 48 publications

(139 reference statements)

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“…The application of HR to the critical power (CP) model to derive the critical heart rate (CHR) [18] has been suggested to provide an individualized, physiologically based threshold that meets the intensity (83-94% HR of VO 2peak ) and duration (>24 min) recommendations for cardiorespiratory endurance training [16,17,19]. The CHR is derived from the linear regression of the total heartbeats (HB Lim ) versus T Lim from multiple exhaustive work bouts at various power outputs.…”

Section: Introductionmentioning

confidence: 99%

“…The CHR is derived from the linear regression of the total heartbeats (HB Lim ) versus T Lim from multiple exhaustive work bouts at various power outputs. Previous work [16,17,19] has shown that the decreases in work rate required to maintain HR at CHR results in more sustainable intensities (i.e., longer times to exhaustion (T Lim )) than those anchored by power output yet elicit a metabolic stimulus within the recommended range [16][17][18]. Specifically, exercise at or just below (minus 5 b•min −1 ) CHR was sustained from ~12 to 60 min with metabolic responses maintained (64-88% .…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, exercise at or just below (minus 5 b•min −1 ) CHR was sustained from ~12 to 60 min with metabolic responses maintained (64-88% . VO 2peak ) within the desired ranges for improving cardiorespiratory fitness [17,19]. Succi et al [19] directly compared exercise at CHR to exercise at the power output associated with CHR and demonstrated that CHR was more sustainable (longer T Lim ) than constant power output exercise.…”

Section: Introductionmentioning

confidence: 99%

“…VO 2peak ) within the desired ranges for improving cardiorespiratory fitness [17,19]. Succi et al [19] directly compared exercise at CHR to exercise at the power output associated with CHR and demonstrated that CHR was more sustainable (longer T Lim ) than constant power output exercise. These differences in sustainability may potentially result in disparate physiological stimuli depending on the anchoring scheme.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, during exercise anchored to both a constant HR and a constant power output, subjects demonstrated . VO 2 , HR, and RPE values that were within the American College of Sports Medicine (ACSM) exercise prescription guidelines [1,19]. However, during constant power output exercise, participants demonstrated progressive increases in .…”

Section: Introductionmentioning

confidence: 99%

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Physiological, Perceptual, and Neuromuscular Responses to V˙O2-Clamp Cycle Ergometry Exercise

Succi,

Dinyer-McNeely,

Voskuil

et al. 2024

Physiologia

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Recommendations for endurance exercise prescription are often based on percentages of heart rate (HR) or the volume of oxygen consumption (V˙O2) maximum or reserve that is extrapolated to a power output (P) or velocity. Previous work has demonstrated dissociations of the expected responses to exercise anchored to the critical heart rate (CHR) compared with the P associated with CHR. However, it is unclear if similar dissociations due to reductions in P to maintain the designated intensity would be present during exercise anchored to the V˙O2 associated with CHR (V˙O2CHR). The purpose of this study was to examine the patterns in physiological (V˙O2, HR, P, respiration rate [RR], muscle oxygen saturation [%SmO2]), neuromuscular (electromyographic and mechanomyographic amplitude [EMG AMP, MMG AMP], mean power frequency [EMG MPF, MMG MPF]), and perceptual (rating of perceived exertion [RPE]) responses during exercise at V˙O2CHR (V˙O2-clamp). On separate days, ten participants (age: 25 ± 4 yr) performed a graded exercise test and four constant P trials at 85–100% of peak P (PP) to derive CHR and V˙O2CHR. Responses were recorded during a trial to exhaustion at V˙O2CHR (32.86 ± 7.12 mL·kg−1·min−1; TLim = 31.31 ± 21.37 min) and normalized in 10% intervals of TLim to their respective values at PP. The one-way repeated-measures ANOVA with post hoc, Bonferroni-corrected, pairwise comparisons indicated differences (p < 0.001) from baseline for HR (mean ± SD %change = 8 ± 3%), RR (43 ± 38%), P (−15 ± 5%), EMG MPF (10 ± 8%), and RPE (65 ± 38%), but no differences (p = 0.077–0.955) for %SmO2 (−17 ± 53%), EMG AMP (−3 ± 16%), MMG AMP (40 ± 61%), and MMG MPF (1 ± 7%). The loss in performance observed during V˙O2-Clamp exercise may provide a quantification of the inefficiency associated with the V˙O2 slow component phenomenon. The neuromuscular responses suggested constant muscle excitation despite the reductions in P, but the metabolic and perceptual responses suggested a combination of feedforward and feedback mechanisms regulating TLim. Future studies should further examine responses to the V˙O2-Clamp exercise at a uniform threshold.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physiological, Perceptual, and Neuromuscular Responses to V˙O2-Clamp Cycle Ergometry Exercise

Succi,

Dinyer-McNeely,

Voskuil

et al. 2024

Physiologia

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Metabolic and Perceptual Responses to Constant Heart Rate Exercise at Vigorous Intensities in Women

GUSTAVE,

MITCHINSON,

SUCCI

et al. 2024

Medicine &Amp; Science in Sports &Amp; Exercise

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Purpose This study quantified the metabolic demands (oxygen uptake [V̇O2]), power output adjustments, changes in the V̇O2/power output ratio, and perceptual responses (rating of perceived exertion [RPE]) during constant heart rate (HR) exercise performed within the vigorous intensity range (77-95% HRpeak). Methods Twelve women (mean ± SD age: 22 ± 4 years) performed a graded exercise test to exhaustion to determine peak parameters and 3, randomly ordered, constant HR trials to exhaustion or for 60 min at the lower (HRL = 77% HRpeak), middle (HRM = 86% HRpeak), and higher (HRH = 95% HRpeak) end of the vigorous intensity range. Time course of changes and patterns of responses were examined for V̇O2, power output, V̇O2/power output, and RPE for the composite and for each subject. Results Across the HRL (time to exhaustion [Tlim] = 56.3 ± 9.9 min), HRM (51.8 ± 13.5 min), and HRH (27.2 ± 17.7 min) trials, V̇O2 and power output decreased quadratically (p < 0.05) relative to the initial value from 10-100% of Tlim, while the V̇O2/power output increased quadratically from 20-100% Tlim, and RPE increased linearly from 50-100% Tlim. The V̇O2 and RPE, collapsed across time, for HRL (54.3 ± 3.3% V̇O2peak, 11 ± 1.5 RPE) were lower than HRM (64.9 ± 4.5% V̇O2peak, 14 ± 1.7 RPE) and both were lower than HRH (80.1 ± 4.1% V̇O2peak, 17 ± 1.4 RPE). None of the 12 subjects at HRL, 6 at HRM, and 7 at HRH were within the vigorous V̇O2 range. Conclusions The HRL was not sufficient to meet the desired metabolic intensity for vigorous exercise, while the middle to higher end of the range elicited a V̇O2 within the prescribed range of only ~50-60% of the subjects. This study indicated that exercise held constant at a percentage of HRpeak cannot consistently be used to prescribe a desired metabolic stimulus.

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Responses to Exercise at the Critical Heart Rate vs. the Power Output Associated With the Critical Heart Rate

Cited by 2 publications

References 48 publications

Physiological, Perceptual, and Neuromuscular Responses to V˙O2-Clamp Cycle Ergometry Exercise

Physiological, Perceptual, and Neuromuscular Responses to V˙O2-Clamp Cycle Ergometry Exercise

Metabolic and Perceptual Responses to Constant Heart Rate Exercise at Vigorous Intensities in Women

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