PHYSIOLOGICAL REACTION OF MEN UNDER EXERCISE TO RADIANT HEAT

To investigate the effect of the radiant heat on the human body in a hot environment, the subjects exposed their nude back to a radiant heat of 1.3 and 2.6 cal/ cm2. min, using the exsiccating infrared illuminators under a hot ambient condition of a temperature 31℃, with a relative humidity of 55% and a 0.5 m/sec air flow. The 8 subjects were healthy male college students aged 20 to 25. The following results were obtained by estimating the physiological reactions to different degrees of radiant heat at rest for 60 minutes and during exercise for 30 minutes on a bicycle e1gomete1·by 272 kg. m / min (or 600 kp. m/ min). 1) The mean skin temperature, heart rate, respiration rate and body weight loss r ate increased at rest in parallel with the degree of the radiant heat, and during exercise the mean skin temperature, heart rate, respiration rate, body weight loss rate and respiratory volume increased, but the Na+ loss rate decreased. The regression equation was obtained to show the quantitative relationship between the degree of the radiant heat and the physiological body reactions. 2) By computing the Heat Tolerance Index by Inoue et al., it was clarified that the higher the degree of the radiant heat was, the smaller was the index. And as there was a close correlation between the indices both at rest and during exercise, it was suggested that for the evaluation of heat tolerance, the radiant heat by the infra1ed illuminators is applicable as additional heat loading besides hot water bathing or staying in a hot chamber

A RAPID SPECTROPHOTOMETRIC DETERMINATION OF CARBOXYHEMOGLOBIN IN BLOOD

A method is described whereby carboxyhemoglobin in the blood is rapidly and accurately determined by spectrophotometric analysis. The γ-wave ranging from 400 to 500 nm was used for the determination, and to increase the stability of the absorption value the isosbestic point was utilized. This method is simple; a heparinized whole blood sample, diluted to about 1:100 to 1:200, is placed in a cuvette and the absorbance is measured at the wavelengths of 413.2 nm, 421 nm and 431.3 nm against water as the zero reference standard. The absorbances of the standard solutions of 0% of CO-Hb and 100% of CO-Hb are also measured, and by these absorbance values the concentrations of CO-Hb are calculated. To make the procedure simpler, it is convenient to use a factor composed by personal and instrumental ones, which is obtained during the calibration by the spectrophotometer. Using this factor, the determinations of the absorbances of standard solutions of 0% and 100% of CO-Hb can be omitted

REACTION OF SWIMMERS TO COLD

This study was carried out to know the physiological reaction to cold of swimmers, acclimatized to cold. Experiments were made on four healthy adult males aged 25 to 28 years, two excellent swimmers and two students being in the nude and seated on a stool in the climate chamber adjusted to a room temperature of about 12℃. Heat production, rectal temperature, and skin temperature were measured and the following results were obtained. 1. Increase of heat production was remarkably small in the swimmers and the onset of shivering was observed late or not shown. 2. The rectal temperature and the mean skin temperature of the swimmers were lower than that of the control group, and the rate of temperature fall was greater than that in the control group. 3. There was no great difference in the peripheral extremity skin temperature between the two groups