| Summary: | 碩士 === 國立體育學院 === 運動科學研究所 === 81 === Hypoxia could increase hemoglobin and decrease aerobic
capacity in altitude. To determine the efffects of
intermetent hypoxia to aerobic capacity and blood cell in
normoxia, five male subjects breathed mixed air with low
oxygen pressure (FIO2 = 11.18%) during sleep for eleven days,
and were tested using increasing load bicycle ergometer.
Hemoglobin increased significantly after hypoxia sleep (H)
at the 12th day, and decreased slightly aftr two weeks
follow up at the 26th day (F). At H, there were no
significant diffirence between pretest and AH about aerobic
capacity. At F, maximun oxygen cunsumption increased 6.5%
but not significant, maximun heart rate was not different
among pretest, H and F. Maximun oxygen pulse and total
work increased 8.6% and 12.7, respectively. Maximun
lactic acid, increased 34.8% ( 6.5 to 8.76 mmol/l ),
but not significant. Lactate threshold increased slightly (
22.42 to 24.41 ml/min/kg), and significantly. At submax
exercise, oxygen consumption, heart rate, oxygen
equivalent, pH and oxygen pulse were not significantly
different between H and pretest, but oxygen consumption,
oxygen pulse and pH increased significantly at F. Heart
rate, oxygen equivalent were decreased significantly at
F. There were negative correlation between lactate acid and
glucose during exercise excluded which at F. pH increased at
the 6th day and F no matter when at rest or at submax
exercise. These results suggested that the aerobic capacity
increased at F, and the major reason came from physical
adaptions to hypoxia that increased hemoglobin, cardiac
output, oxygen consumption, pH and tolerance to lactic acid.
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