BIOCHEMICAL AND PHYSIOLOGICAL EVALUATION OF HUMAN SUBJECTS WEARING PRESSURE SUITS UNDER SIMULATED AEROSPACE CONDITIONS

摘要

A series of experiments has been designed to determine the water, energy, and protein requirements of man under various simulated aero¬space conditions. The experiment described measured the effects of wearing a MA-10 pressure suit continuously for 14 days on the afore¬mentioned measurements. A freshly prepared diet that closely matched proposed aerospace diets was fed to four human volunteers and coefficients of apparent digestibility and balances of the component nutrients were de-termined. The results showed that the wearing of unpressurized MA-10 suits under ambient conditions for 14 days did not affect the subjects* fluid intake and output. No significant changes were observed in digestibilities or balances of the nutrient components. Results indicated that the fresh food diet was very efficiently utilized. No significant changes in subject blood pressures, oral temperatures or pulse rates were observed during the experiment. All hematological and chemical analyses of blood were within the normal range and did not exhibit differences between experimental periods. The 2 day menu of fresh foods proved to be very acceptable and did not decrease in acceptability during the 42 day experiment.