Relationship of physiological strain to change in heart rate during work in the heat.
Am Ind Hyg Assoc J 1972 Nov; 33(11):701-708
Data collected from experiments involving intermittent cycling and load carrying in dry, neutral to hot, ambient temperatures and prolonged walking in hot, humid environments were used for correlation analysis between some measured physiological variables. Increasing the air temperature resulted in a shift of regression line of heart rate on oxygen uptake such that heart rate was 10 beats per minute higher for a rise of 10 degrees centigrade in temperature, an apparent slope for the linear regression of the heart rate during the last minute of work on the heart rate during the first minute of recovery becoming less steep with rise in temperature. For prolonged work loads, required oxygen uptake is about 1 liter per minute and about 1.5 to 2.8 liters per minute. The regression of rectal temperature on heart rate was 0.03 degrees centigrade and 0.01 degrees centigrade per beat per minute respectively. It was concluded that the rate of change rather than absolute values of these parameters might provide a better guide for evaluation of strain, particularly when intermittent type of work is involved.
NIOSH-Publication; NIOSH-Grant; Respiration; Heat-stress; Physiological-responses; Work-loads; Work-capacity; Thermal-effects; Heart-function
Occupational Health Univ of Pittsburgh Sch of PH 130 DE Soto Street Pittsburgh, PA 15213
American Industrial Hygiene Association Journal
University of Pittsburgh, Pittsburgh, Pennsylvania