Effect of Thermal Stress and Workload on Oxygen Debt in Healthy Subjects

G. P. Dimri; J. Sen Gupta

doi:10.14429/dsj.46.4061

G. P. Dimri Defence Research & Development Organisation, DRDO HQrs, New Delhi
J. Sen Gupta Defence Research & Development Organisation, DRDO HQrs, New Delhi

DOI: https://doi.org/10.14429/dsj.46.4061

Keywords: Neostigmine, Pulmonary vagal afferents, Bronchoconstriction, Hemicholinium-3, Prazosin, Hexamethonium, Anatoxin

Abstract

The influence of thermal load on oxygen debt has been investigated. The experimental data were collected on six young healthy male subjects who were naturally acclimatized to heat. They were Studied under three environmental conditions which may be classified for convenience sake as comfortable (C),hot humid (HH), and every hot humid (VHH), The subjects were given exercise on a bicycle ergometer for 6 min at 6rpm, and their oxygen consumption was measured during rest, throughout exercise period (6min) and for 30 min post-exercise period. The oxygen debt was determined at three different submaximal Workloads of 400,500 and 600 Kgm/min (equivalent 65, 82 and 98 W ) under each environmental condition. The results indicate a significant increase in oxygen debt with increase in thermal stress (p <.001) as well as workload (p <.001). Liner regression equations have been constructed as suggestive alternative method for the prediction of oxygen debt from thermal load or/and workload

Author Biographies

G. P. Dimri, Defence Research & Development Organisation, DRDO HQrs, New Delhi

Dr G P Dimri is presently Joint Director at the Directorate of Biomedical & Applied Science, DRDO HQrs, New Delhi. He received His PhD in 1984 from Delhi University. He has been working in the area of exercise physiology and biomathematics for over 30 years. He has about 85 publication to his credit. He has developed mathematical models in the area of exercise physiology.

J. Sen Gupta, Defence Research & Development Organisation, DRDO HQrs, New Delhi

Dr J Sen Gupta, who has since retired as Director, Defence Institute of Physiology & Allied Sciences, Delhi Cantt, had been working in heat Physiology, high altitude physiology, exercise physiology, ergonomics, and sports medicine. He has more than 100 publication to his credit. He has held positions in Indian Science Congress Association and APPI as sectional President.