Thein M
Physiology Research Division, Department of Medical Research, Rangoon, Burma.
J Trop Med Hyg. 1987 Aug;90(4):177-80.
The physiological responses to exercise of 18 sawmill workers and 17 trishaw pedallers were measured and compared. The oxygen intake and heart rates of the two groups were tested at different levels of exercise and samples of expired air were taken for analysis. Oxygen intake for a given work load was similar in both groups, but cardiac frequency was elevated in the sawmill group.