Accession Number : AD0716580

Title :   Exhausting Work Limited by External Resistance and Inhalation of Carbon Dioxide.

Descriptive Note : Technical rept.,

Corporate Author : EDGEWOOD ARSENAL MD

Personal Author(s) : Craig,F. N. ; Blevins,W. V. ; Cummings,E. G.

Report Date : DEC 1970

Pagination or Media Count : 42

Abstract : The objectives of the investigation were to find the intensities of work at which the reduction in endurance associated with inspiratory resistance would be the greatest and to test various hypotheses to account for the reduction. The following conclusions were reached: The reduction in endurance in exhausting work caused by an added inspiratory resistance is greater when the intensity is such that exhaustion is reached in from 5 to 15 minutes than when higher intensities of work lead to exhaustion in a shorter time; of the various factors examined in this report, the sense of impending exhaustion appears to be associated most closely with the reduction of the duration of expiration to a minimum value characteristic of the individual; in exhausting work, men can withstand the large elevation in alveolar carbon dioxide associated with the inhalation of carbon dioxide mixture better than the smaller but still substantial elevation in alveolar carbon dioxide associated with an added inspiratory resistance. (Author)

Descriptors :   (*ENDURANCE(PHYSIOLOGY), EXERCISE(PHYSIOLOGY)), (*RESPIRATION, ENDURANCE(PHYSIOLOGY)), (*CARBON DIOXIDE, RESPIRATION), PHYSIOLOGY, LUNG, OXYGEN CONSUMPTION, TABLES(DATA), HEART

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE