Arterial Oxygen Desaturation Response to Repeated Bouts of Sprint Exercise in Healthy Young Women
The decline in arterial oxygen saturation of hemoglobin during exercise has been termed exercise-induced arterial hypoxemia (EIAH). We examined whether repeated bouts of sprint exercise (SprE) would induce EIAH in healthy young men and women. Ten men and 11 women (20.4 ± 0.3 year) performed an anaerobic power test (three bouts of 10 s cycling with 120 s intervals) using a cycle ergometer. Arterial oxygen saturation of hemoglobin measured by pulse oximeter (SpO2), heart rate (HR), rate perceived exertion (RPE), and the blood lactate concentration ([La]b) were assessed at rest, during, and 5 min after repeated bouts of SprE. Women exhibited a lower maximal anaerobic power (MAnP) compared to men (498 ± 23 vs. 759 ± 22 watts, respectively, p < 0.01). HR, RPE, and [La]b in women were comparable with those in men throughout the test. However, the only significant decline in SpO2 after a single bout of SprE (95.5 ± 0.7%) from the resting value (97.9 ± 0.2%) was observed in women, and further declines occurred following heavier SprE (< 95%). In 8 of 11 women, mild to moderate EIAH developed, whereas only 2 men showed mild EIAH. Thus, these findings suggest that repeated bouts of SprE might induce mild EIAH in young women but not men.
KeywordsPulse Oximeter Blood Lactate Concentration Maximal Oxygen Consumption Anaerobic Power Repeated Bout
We thank the volunteers for participating in this study. This study was supported in part by grant-in-aids for scientific research from the Ministry of Education, Science, Sports, and culture Japan 20300221.
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