Live high: train low increases muscle buffer capacity and submaximal cycling efficiency

C J Gore; A G Hahn; R J Aughey; D T Martin; M J Ashenden; S A Clark; A P Garnham; A D Roberts; Gary J Slater; M J Mckenna

doi:10.1046/j.1365-201X.2001.00906.x

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Live high: train low increases muscle buffer capacity and submaximal cycling efficiency

Journal article

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Live high: train low increases muscle buffer capacity and submaximal cycling efficiency

C J Gore, A G Hahn, R J Aughey, D T Martin, M J Ashenden, S A Clark, A P Garnham, A D Roberts, Gary J Slater and M J Mckenna

Acta Physiologica, Vol.173(3), pp.247-350

2001

DOI: https://doi.org/10.1046/j.1365-201X.2001.00906.x

PMID: 1736690

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Abstract

Human Movement and Sports Science

Medical Physiology

Nutrition and Dietetics

altitude training

cycling efficiency

hypoxia

muscle buffering

This study investigated whether hypoxic exposure increased muscle buffer capacity (βm) and mechanical efficiency during exercise in male athletes. A control (CON, n=7) and a live high:train low group (LHTL, n=6) trained at near sea level (600 m), with the LHTL group sleeping for 23 nights in simulated moderate altitude (3000 m). Whole body oxygen consumption (V˙O2) was measured under normoxia before, during and after 23 nights of sleeping in hypoxia, during cycle ergometry comprising 4×4-min submaximal stages, 2-min at 5.6 ± 0.4 W kg–1, and 2-min ‘all-out’ to determine total work and V˙O2peak. A vastus lateralis muscle biopsy was taken at rest and after a standardized 2-min 5.6 ± 0.4 W kg–1 bout, before and after LHTL, and analysed for βm and metabolites. After LHTL, βm was increased (18%, P less than 0.05). Although work was maintained, V˙O2peak fell after LHTL (7%, P less than 0.05). Submaximal V˙O2 was reduced (4.4%, P less than 0.05) and efficiency improved (0.8%, P less than 0.05) after LHTL probably because of a shift in fuel utilization. This is the first study to show that hypoxic exposure, per se, increases muscle buffer capacity. Further, reduced V˙O2 during normoxic exercise after LHTL suggests that improved exercise efficiency is a fundamental adaptation to LHTL.

Details

Title: Live high: train low increases muscle buffer capacity and submaximal cycling efficiency
Authors: C J Gore (Author) - Australian Institute of Sport
A G Hahn (Author) - Australian Institute of Sport
R J Aughey (Author) - Victoria University of Technology
D T Martin (Author) - Australian Institute of Sport
M J Ashenden (Author) - Australian Institute of Sport
S A Clark (Author) - Australian Institute of Sport
A P Garnham (Author) - Deakin University
A D Roberts (Author) - Canberra University
Gary J Slater (Author) - Australian Institute of Sport
M J Mckenna (Author) - Victoria University of Technology
Publication details: Acta Physiologica, Vol.173(3), pp.247-350
Publisher: Wiley-Blackwell Publishing Ltd.
Date published: 2001
DOI: 10.1046/j.1365-201X.2001.00906.x
ISSN: 1748-1708
PMID: 1736690
Organisation Unit: University of the Sunshine Coast, Queensland; School of Health - Nutrition & Dietetics; School of Health and Sport Sciences - Legacy; School of Health and Behavioural Sciences - Legacy
Language: English
Record Identifier: 99450256902621
Output Type: Journal article

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