Relation of heart rate to percent VO2 peak during submaximal exercise in the heat.

Details

Serval ID
serval:BIB_37630
Type
Article: article from journal or magazin.
Collection
Publications
Title
Relation of heart rate to percent VO2 peak during submaximal exercise in the heat.
Journal
Journal of Applied Physiology
Author(s)
Arngrímsson S.A., Stewart D.J., Borrani F., Skinner K.A., Cureton K.J.
ISSN
8750-7587 (Print)
ISSN-L
0161-7567
Publication state
Published
Issued date
2003
Peer-reviewed
Oui
Volume
94
Number
3
Pages
1162-1168
Language
english
Abstract
We tested the hypothesis that elevation in heart rate (HR) during submaximal exercise in the heat is related, in part, to increased percentage of maximal O(2) uptake (%Vo(2 max)) utilized due to reduced maximal O(2) uptake (Vo(2 max)) measured after exercise under the same thermal conditions. Peak O(2) uptake (Vo(2 peak)), O(2) uptake, and HR during submaximal exercise were measured in 22 male and female runners under four environmental conditions designed to manipulate HR during submaximal exercise and Vo(2 peak). The conditions involved walking for 20 min at approximately 33% of control Vo(2 max) in 25, 35, 40, and 45 degrees C followed immediately by measurement of Vo(2 peak) in the same thermal environment. Vo(2 peak) decreased progressively (3.77 +/- 0.19, 3.61 +/- 0.18, 3.44 +/- 0.17, and 3.13 +/- 0.16 l/min) and HR at the end of the submaximal exercise increased progressively (107 +/- 2, 112 +/- 2, 120 +/- 2, and 137 +/- 2 beats/min) with increasing ambient temperature (T(a)). HR and %Vo(2 peak) increased in an identical fashion with increasing T(a). We conclude that elevation in HR during submaximal exercise in the heat is related, in part, to the increase in %Vo(2 peak) utilized, which is caused by reduced Vo(2 peak) measured during exercise in the heat. At high T(a), the dissociation of HR from %Vo(2 peak) measured after sustained submaximal exercise is less than if Vo(2 max) is assumed to be unchanged during exercise in the heat.
Keywords
Adult, Anaerobic Threshold/physiology, Exercise/physiology, Heart Rate/physiology, Hot Temperature, Humans, Male, Oxygen Consumption/physiology, Perception/physiology, Physical Endurance/physiology, Physical Fitness/physiology, Walking/physiology
Pubmed
Web of science
Create date
19/11/2007 10:12
Last modification date
20/08/2019 13:25
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