PRINCIPAL INVESTIGATOR(S ) : James M. Waligora, and David J. Horrigan 



EXPERIMENT TITLE/NUMBER : Metabolism and Heat Dissipation During Apollo EVA 



Periods 



PROGRAM/MISSION : Apollo 



CLASSIFICATION : Human 



DISCIPLINE(S) : Cardiovascular, Behavioral science 



OBJECTIVES : To determine the life support requirements during extravehicular 

 activity (EVA). 



PROTOCOL : Metabolic rate was determined by measuring heart rate, oxygen 

 usage, and coolant water temperature change. These, as well as body heat and 

 other physiological parameters, were measured as the astronauts participated 

 in these four types of EVA: overhead activities, deploying Apollo lunar 

 surface experiment packages, making geological surveys, and riding in the 

 lunar roving vehicle. 



EQUIPMENT : Pressure suit, liquid cooling garment (LCG). 



RESULTS : Metabolic rates were lower than expected for Apollo EVA. Overhead 

 activities were the most energy consuming tasks performed. The highest 

 metabolic rate was in the Apollo 11 LMP, who was very active in evaluating 

 modes of locomotion. The lowest metabolic rates occurred while astronauts 

 drove and rode in the lunar roving vehicle. Data from Apollo 1M showed poor 

 correlation between lunar walking speed and metabolic rate. Results from 

 observations of Apollo 15 and 16 time and motion studies indicated that tasks 

 were completed more rapidly at one-g wearing the space suit than at 1/6-g, but 

 at a higher metabolic rate. 



CONCLUSIONS : The crewmen were able to perform EVA and to extend them to the 

 maximum time without medical problems. Metabolic rates were lower than 

 predicted. The liquid cooling garment was effectively used. 



PUBLICATIONS : 82, M60, 551, 55^, 555 



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