Gallagher, C. A., Willems, M. E. T., Lewis, M. P. and Myers, S. D. (2014) Effect of acute normobaric hypoxia on the ventilatory threshold. European Journal of Applied Physiology, 114 (8). pp. 1555-1562. ISSN 1439-6319
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Abstract
PURPOSE:
This study investigated the response of the ventilatory threshold (VT) to acute normobaric hypoxia and compared the agreement between software-based algorithms which use automatic detection to identify the VT. Results were used to examine whether the VT can be used as a physiological parameter to prescribe and monitor exercise intensity in hypoxic exercise training programs.
METHODS:
Fourteen untrained individuals (7 women, 7 men; age 22 ± 2 years, [Formula: see text]O2peak 46 ± 7 mL kg(-1) min(-1)) completed five identical graded exercise tests (randomized order) on a cycle ergometer to measure VT at sea-level (SL) and in response to four normobaric hypoxic conditions (FIO2: 0.185, 0.165, 0.142, 0.125) equivalent to 1,000, 2,000, 3,000 and 4,000 m. Data were analyzed using a one-way analysis of variance (ANOVA) with repeated measures.
RESULTS:
The VT was similar across all conditions (SL = 1.98 ± 0.46, 1,000 m = 2.03 ± 0.61, 2,000 m = 2.27 ± 0.62, 3,000 m = 1.84 ± 0.50, 4,000 m = 2.29 ± 0.58 L min(-1)) for all algorithms used despite a reduction in arterial oxygen saturation at 3,000 (P ≤ 0.01) and 4,000 m (P ≤ 0.01) compared with SL values.
CONCLUSION:
The VT appears to be a suitable physiological parameter for exercise prescription in normobaric hypoxia up to an altitude of 4,000 m.
Publication Type: | Articles |
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Uncontrolled Keywords: | Normobaric hypoxia, exercise prescription, cycle ergometry, ventilatory threshold, altitude |
Subjects: | Q Science > QP Physiology R Medicine > RC Internal medicine > RC1200 Sports Medicine |
Divisions: | Academic Areas > Institute of Sport > Area > Sports Biomechanics and Sports Therapy |
Depositing User: | Mark Willems |
Date Deposited: | 04 Jun 2014 10:31 |
Last Modified: | 18 Oct 2022 11:21 |
URI: | https://eprints.chi.ac.uk/id/eprint/1201 |
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