Age differences in physiological responses to self?paced and incremental VO2max testing

Jenkins, L.A. and Mauger, Alexis R. and Hopker, James G. (2016) Age differences in physiological responses to self?paced and incremental VO2max testing. European Journal of Applied Physiology, . ISSN 1439-6319. E-ISSN 1439-6327. (doi:https://doi.org/10.1007/s00421-016-3508-6) (Full text available)

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http://dx.doi.org/10.1007/s00421-016-3508-6

Abstract

Purpose A self-paced maximal exercise protocol has demonstrated higher V?O2maxV?O2max values when compared against traditional tests. The aim was to compare physiological responses to this self-paced V?O2maxV?O2max protocol (SPV) in comparison to a traditional ramp V?O2maxV?O2max (RAMP) protocol in young (18–30 years) and old (50–75 years) participants. Methods Forty-four participants (22 young; 22 old) completed both protocols in a randomised, counter-balanced, crossover design. The SPV included 5 × 2 min stages, participants were able to self-regulate their power output (PO) by using incremental ‘clamps’ in ratings of perceived exertion. The RAMP consisted of either 15 or 20 W min?1. Results Expired gases, cardiac output (Q), stroke volume (SV), muscular deoxyhaemoglobin (deoxyHb) and electromyography (EMG) at the vastus lateralis were recorded throughout. Results demonstrated significantly higher V?O2maxV?O2max in the SPV (49.68 ± 10.26 ml kg?1 min?1) vs. the RAMP (47.70 ± 9.98 ml kg?1 min?1) in the young, but not in the old group (>0.05). Q and SV were significantly higher in the SPV vs. the RAMP in the young (<0.05) but not in the old group (>0.05). No differences seen in deoxyHb and EMG for either age groups (>0.05). Peak PO was significantly higher in the SPV vs. the RAMP in both age groups (<0.05). Conclusion Findings demonstrate that the SPV produces higher V?O2maxV?O2max , peak Q and SV values in the young group. However, older participants achieved similar V?O2maxV?O2max values in both protocols, mostly likely due to age-related differences in cardiovascular responses to incremental exercise, despite them achieving a higher physiological workload in the SPV.

Item Type: Article
Uncontrolled keywords: RPE; Maximal exercise; Cardiac output; Pacing
Subjects: R Medicine > RC Internal medicine > RC1235 Physiology of sports
Divisions: Faculties > Sciences > School of Sport and Exercise Sciences
Depositing User: James Hopker
Date Deposited: 12 Dec 2016 20:32 UTC
Last Modified: 08 Jun 2017 08:52 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/59652 (The current URI for this page, for reference purposes)
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