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Plasma lactate accumulation is reduced during incremental exercise in untrained women compared with untrained men

journal contribution
posted on 2017-12-06, 00:00 authored by Charli SargentCharli Sargent, G Scroop
The lactate threshold (LT) is commonly reported as not different between sexes, yet lower blood lactate concentrations have been reported in women during submaximal exercise. The purpose of the present study was to measure the changes in plasma lactate concentration [La−1] in men and women during incremental cycle ergometer exercise using the same protocol and compare the data using several different methods of analysis. A group of untrained men (n = 21) and women (n = 22) were studied and venous blood drawn at regular intervals during and after exercise for assay of plasma [La−1]. Plasma [La−1] increased during exercise in both sexes, reaching higher values in men, both at exhaustion (men 8.6 ± 2.3 mmol l−1; women 6.2 ± 2.3 mmol l−1; P = 0.01) and post-exercise (men 11.8 ± 2.1 mmol l−1; women 10.2 ± 2.4 mmol l−1; P = 0.03). Logarithmic transformation of the data yielded LT values that were not different between sexes (men 44.2 ± 12.9; women 50.2 ± 12.6; %V˙O2peak; P=0.45), yet both the 2 and 4 mmol l−1 fixed concentration LT occurred at lower relative intensities in men (2 mmol l−1: men 50.9 ± 12.9; women 66.9 ± 11.1; %VO2peak;P=0.01. 4 mmol l−1: men 75.7 ± 11.0; women 90.6 ± 9.2; V˙O2peak;P=0.01). However, when the plasma [La−1] was examined in both sexes throughout exercise, using a single exponential function, plasma [La−1] was significantly lower in women (P < 0.05) at all relative intensities between 30 and 100%V˙O2peak. While the basis of this sex difference is unknown, reduced plasma [La−1] during submaximal exercise in women may offset to some degree the endurance performance disadvantage of their lower VO2peak.

History

Volume

101

Issue

1

Start Page

91

End Page

96

Number of Pages

6

eISSN

1439-6327

ISSN

1439-6319

Location

Germany

Publisher

Springer

Language

en-aus

Peer Reviewed

  • Yes

Open Access

  • No

External Author Affiliations

Royal Adelaide Hospital; TBA Research Institute; University of Adelaide;

Era Eligible

  • No

Journal

European journal of applied physiology.

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