Increases in the incremental exercise mean response time across the steady state domain: Implications for exercise testing & prescription

Bridgette O'Malley; Robert A Robergs; Todd A. Astorino

doi:10.1016/j.smhs.2024.02.002

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Increases in the incremental exercise mean response time across the steady state domain: Implications for exercise testing & prescription

Journal article

Open access

Peer reviewed

Increases in the incremental exercise mean response time across the steady state domain: Implications for exercise testing & prescription

Bridgette O'Malley, Robert A Robergs and Todd A. Astorino

Sports Medicine and Health Science, Vol.6(4), pp.315-323

2024

DOI: https://doi.org/10.1016/j.smhs.2024.02.002

PMID: 39309463

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Abstract

Exercise prescription

Exercise testing

Incremental exercise

Mean response time (MRT)

Steady state (SS)

We hypothesized that slowed oxygen uptake (V˙O2) kinetics for exercise transitions to higher power outputs (PO) within the steady state (SS) domain would increase the mean response time (MRT) with increasing exercise intensity during incremental exercise. Fourteen highly trained cyclists (mean ± standard deviation [SD]; age (39 ± 6) years [yr]; and V˙O2 peak = (61 ± 9) mL/kg/min performed a maximal, ramp incremental cycling test and on separate days, four 6-min bouts of cycling at 30%, 45%, 65% & 75% of their incremental peak PO (Wpeak). SS trial data were used to calculate the MRT and verified by mono-exponential and linear curve fitting. When the ramp protocol attained the value from SS, the PO, in Watts (W), was converted to time (min) based on the ramp function W to quantify the incremental MRT (iMRT). Slope analyses for the V˙O2 responses of the SS versus incremental exercise data below the gas exchange threshold (GET) revealed a significant difference (p = 0.003; [0.437 ± 0.08] vs. [0.382 ± 0.05] L⋅min−1). There was a significant difference between the 45% Wpeak steady state V˙O2 (ss V˙O2) ([3.08 ± 0.30] L⋅min−1, respectively), and 30% Wpeak ss V˙O2 (2.26 ± 0.24) (p < 0.0001; [3.61 ± 0.80] vs. [2.20 ± 0.39] L⋅min−1) and between the iMRT for 45% and 30% Wpeak ss V˙O2 values ([50.58 ± 36.85] s vs. [32.20 ± 43.28] s). These data indicate there is no single iMRT, which is consistent with slowed V˙O2 kinetics and an increasing V˙O2 deficit for higher exercise intensities within the SS domain.

Details

Title: Increases in the incremental exercise mean response time across the steady state domain: Implications for exercise testing & prescription
Authors: Bridgette O'Malley (Corresponding Author) - Queensland University of Technology
Robert A Robergs (Corresponding Author) - Queensland University of Technology
Todd A. Astorino - California State University, San Marcos
Publication details: Sports Medicine and Health Science, Vol.6(4), pp.315-323
Publisher: KeAi Publishing Communications Ltd.
Date published: 2024
DOI: 10.1016/j.smhs.2024.02.002
ISSN: 2666-3376
PMID: 39309463
Copyright note: © 2024 Chengdu Sport University. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Grant note: We would like to acknowledge the Australian Commonwealth Government's contribution and support to the development of this manuscript through an Australian Government Research Training Program Scholarship.
Organisation Unit: School of Health - Biomedicine; School of Health - Sports & Exercise Science
Language: English
Record Identifier: 991156939802621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Sport Sciences