Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
 
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Journal of Sports Science and Medicine
ISSN: 1303 - 2968
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©Journal of Sports Science and Medicine (2017) 16, 105 - 111
Research article
The Effects of Non-Contingent Feedback on the Incidence of Plateau at V̇O2max
Dan Gordon1,, Marie Gernigon2, James Baker1, Viviane Merzbach1, Adrian Scruton1

1 Cambridge Centre for Sport and Exercise Sciences, Anglia Ruskin University, UK
2 Faculty of Sport, University of Montpellier, France

Dan Gordon
✉ Principal Lecturer exercise physiology and Co-Director of Cambridge Centre for Sport and Exercise Sciences, Anglia Ruskin University, UK
Email: dan.gordon@anglia.ac.uk

Received:
01-12-2016 -- Accepted: 31-01-2017 --
Published (online): 01-03-2017

ABSTRACT

The purpose of this study was to examine the effects of non-contingent feedback in the form of heart rate (HR) on the incidence of plateau at V̇O2max. Ten physically active males (age 24.8 yrs ± 4.2; mass 81.4 ± 9.0 kg; stature 1.80 ± 0.11 m, V̇O2max 53.2 ± 5.8 ml·kg-1.min-1) who were V̇O2max testing naïve but were cognisant as to the heart rate responses to exercise completed four incremental tests to volitional exhaustion, separated by ~72 h for the determination of V̇O2max and gas exchange threshold. The first trial served as a familiarisation with the remaining three being experimental conditions where HR was presented in a screen projection as either the actual response (HR-A) or 10 b·min-1 higher than recorded (HR-H) or 10 b·min-1 lower (HR-L). Throughout all trials V̇O2 was recorded on a breath-by-breath basis with plateau criteria of ≤ 50 ml·min-1. RESULTS: A significant difference was observed for Δ V̇O2 over the final two consecutive 30s sampling periods between HR-A, both HR-L and HR-H (p = 0.049) and for the incidence of plateau response between condition (p = 0.021). An additional significant difference was observed for sub-maximal Δ V̇O2 responses between HR-A and HR-H (p = 0.049) and HR-A and HR-L (p = 0.006). Non-significant differences were observed for all other criteria. These data indicate that when presented with non-contingent feedback in the form of HR, that the perceptually orientated pacing schema becomes disrupted promoting a sparing of the finite anaerobic capacity to compensate for the imbalance between the afferent signal and perception of effort.

Key words: Pacing, incremental exercise, V̇O, V̇O-plateau
Key Points
The manifestation of the plateau at V̇O2max is disrupted (lower incidence rates) when participants are exposed to non-contingent feedback in the form of heart rate.
Non-contingent feedback in the form of heart rate does not affect the V̇O2max score or associated cardio-respiratory parameters.
Given the association between the V̇O2-plateau and the finite anaerobic capacity it is proposed that non-contingent feedback creates a sparing of this resource due to an imbalance between the perception of effort and the bio-feedback.

 


  

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