To investigate the effect of extreme high temperature on the cardiopulmonary function, we measured the heart rate, blood pressure, lung volumes, and breath-holding time before and during exposure to 70℃ environment in male adults.
1) The heart rat...
To investigate the effect of extreme high temperature on the cardiopulmonary function, we measured the heart rate, blood pressure, lung volumes, and breath-holding time before and during exposure to 70℃ environment in male adults.
1) The heart rate demonstrated exquisite sensitivity to extreme high temperature; exposure to heat increased the heart rate from 75 bpm to 124 bpm(65% increase).
2) There was a tendency for both systolic and diastolic pressure to decrease, which was not statistically significant.
3) While the exposure increased the respiratory rate from 19/min to 28/min (47% increase), it decreased the tidal volume from 566ml to 314ml.
4) The vital capacity decreased from control of 4.31 L to 3.26 L during exposure. The exposure also decreased the maximum breathing capacity (before exposure, 99 L; during exposure, 56 L0.
5) The breath-holding time decreased from 48 sec to 38 sec during exposure.