The effects of intermittent exposure to hypoxia during endurance exercise training on the ventilatory responses to hypoxia and hypercapnia in humans |
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Authors: | Keisho Katayama Yasitake Sato Koji Ishida Shigeo Mori and Miharu Miyamura |
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Institution: | (1) Research Center of Health, Physical Fitness and Sports, Nagoya University, Nagoya 464-8601, Japan, JP;(2) Space Medicine Research Center, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan, JP |
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Abstract: | The present study was performed to investigate the effects of a combination of intermittent exposure to hypoxia during exercise
training for short periods on ventilatory responses to hypoxia and hypercapnia (HVR and HCVR respectively) in humans. In a
hypobaric chamber at a simulated altitude of 4,500 m (barometric pressure 432 mmHg), seven subjects (training group) performed
exercise training for 6 consecutive days (30 min · day−1), while six subjects (control group) were inactive during the same period. The HVR, HCVR and maximal oxygen uptake (V˙O2 max) for each subject were measured at sea level before (pre) and after exposure to intermittent hypoxia. The post exposure test
was carried out twice, i.e. on the 1st day and 1 week post exposure. It was found that HVR, as an index of peripheral chemosensitivity
to hypoxia, was increased significantly (P < 0.05) in the control group after intermittent exposure to hypoxia. In contrast, there was no significant increase in HVR
in the training group after exposure. The HCVR in both groups was not changed by intermittent exposure to hypoxia, while V˙O2 max increased significantly in the training group. These results would suggest that endurance training during intermittent exposure
to hypoxia depresses the increment of chemosensitivity to hypoxia, and that intermittent exposure to hypoxia in the presence
or absence of exercise training does not induce an increase in the chemosensitivity to hypercapnia in humans.
Accepted: 18 March 1998 |
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Keywords: | Exercise training High altitude Ventilatory response to hypoxia Ventilatory response to hypercapnia |
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