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J Appl Physiol 88: 1221-1227, 2000;
8750-7587/00 $5.00
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Vol. 88, Issue 4, 1221-1227, April 2000

Cardiovascular response to hypoxia after endurance training at altitude and sea level and after detraining

Keisho Katayama1, Yasutake Sato1, Yoshifumi Morotome1, Norihiro Shima1, Koji Ishida1, Shigeo Mori2, and Miharu Miyamura1

1 Research Center of Health, Physical Fitness and Sports, and 2 Space Medicine Research Center, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan

The purpose of this study was to elucidate 1) the effects of endurance exercise training during hypoxia or normoxia and of detraining on ventilatory and cardiovascular responses to progressive isocapnic hypoxia and 2) whether the change in the cardiovascular response to hypoxia is correlated to changes in the hypoxic ventilatory response (HVR) after training and detraining. Seven men (altitude group) performed endurance training using a cycle ergometer in a hypobaric chamber of simulated 4,500 m, whereas the other seven men (sea-level group) trained at sea level (K. Katayama, Y. Sato, Y. Morotome, N. Shima, K. Ishida, S. Mori, and M. Miyamura. J. Appl. Physiol. 86: 1805-1811, 1999). The HVR, systolic and diastolic blood pressure responses (Delta SBP/Delta SaO2, Delta DBP/Delta SaO2), and heart rate response (Delta HR/Delta SaO2; SaO2 is arterial oxygen saturation) to progressive isocapnic hypoxia were measured before and after training and during detraining. Delta SBP/Delta SaO2 increased significantly in the altitude group and decreased significantly in the sea-level group after training. The changed Delta SBP/Delta SaO2 in both groups was restored during 2 wk of detraining, as were the changes in HVR, whereas there were no changes in the Delta DBP/Delta SaO2 and Delta HR/Delta SaO2 throughout the experimental period. The changes in Delta SBP/Delta SaO2 after training and detraining were significantly correlated with those in HVR. These results suggest that Delta SBP/Delta SaO2 to progressive isocapnic hypoxia is variable after endurance training during hypoxia and normoxia and after detraining, as is HVR, but Delta DBP/Delta SaO2 and Delta HR/Delta SaO2 are not. It also suggests that there is an interaction between the changes in Delta SBP/Delta SaO2 and HVR after endurance training or detraining.

arterial blood pressure; heart rate; hypoxic ventilatory chemosensitivity


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