Yoshitake Nishibayashi

Differences in ventilatory responses to hypoxia and hypercapnia between normal and judo athletes with moderate obesity

SummaryHypercapnic and hypoxic ventilatory sensitivities were compared in twenty-one judoists and 24 control subjects with similar degrees of moderate obesity. Data from ten non-obese control subjects were also included as a reference. Mean body weight (BW) and % of ideal body weight in the judoists and the obese and non-obese controls were 100±14.8, 94.4±5.3 and 63.4±6.1 (mean±SD) kg, and 142.3±16.7, 142.2±12.9 and 98.4±10.7%, respectively. Mean body fat in the judoists was 16.2±13.9%, being 25.3±7.7% in the obese control group, the difference being significant (p<0.01).Hypercapnic sensitivities in terms of the CO2 ventilatory response slope (S) and its normalized value for 70 kg BW (SN) of the obese controls were higher than the judoists. These findings were also verified by the CO2-occlusion pressure responses. S and SN in the obese controls were significantly correlated with BW and % body fat. However, no positive correlation was found between BW and S or SN in the judoists as well as between lean body mass and S or SN in the obese control. Hypoxic sensitivity in terms of the

Heart rate response to breath-holding during supramaximal exercise

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Possible Involvement of Peripheral Chemoreceptor Mechanism in Bradycardia Observed During Breath Holding with Supramaximal Exercise

ventilation hyperbola slope (A) and its normalized value (AN) in the obese control was significantly higher than the non-obese control, but the difference from the judoists was not significant. A and AN were found to increase with increasing % body fat in both judoists and obese controls. We conclude that respiratory compensation to mechanical limitation due to fat accumulation may be one of the possible factors to enhance hypercapnic as well as hypoxic ventilatory chemosensitivities in moderate obesity.

Influence of Controlled Breathing with Diminished Tidal Volume on Hypoxic Heart Rate Response in Man

SummaryTwenty-four active judo athletes were examined by an isocapnic progressive hypoxia test. The results of ventilatory and heart rate responses to hypoxia were analyzed by the hyperbolic equations,

Facial Cold Receptors and the Survival Reflex "Diving Bradycardia" in Man

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Comparison of two synthetic progesterones on ventilation in normal males: CMA vs. MPA

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