ABSTRACT
Objective To explore the effects of mild and moderate acute hypobaric hypoxia on manual performance.Methods Using hypobaric chamber to simulate hypoxia conditions and devising 4 kinds of objective ergonomic testing items(Insert sticks into holes-board,ISIHB;nut-bolt assembly task,NBAT;shape discrimination,SD;and Grip strength,GS including fatigue and tolerance)and one subjective research item(questionnaire subjective sense)to examine manual work efficiency varieties of 9 subjects exposed to a hypobaric chamber with 5 simulated altitudes(3 500,4 000,4 500,5 000 and 5 500 m),for(25?5)min.Results Compared to control group(50 m,the altitude of Beijing):Accomplish time(AT)performance of ISIHB and NBAT significantly decreased(P
ABSTRACT
Objective To search for perfect and logical evaluation indexes of range of motion of manual performance and maximal voluntary range of motion. Methods From mechanism of hand movement and characteristics of manual action,some relative comprehensive evaluation indexes on range of motion of manual performance were provided.Twenty six undergraduates (14 male and 12 female)participated in the test for 16 indexes. Results The maximal voluntary range of motion of thumb,four fingers and wrist were obtained. Conclusion The results can provide foundation for ergonomics design of spacesuit gloves.
ABSTRACT
Objective To find a biomechanical evaluation methods of manual performance fatigue,for providing the feasible methods for the hand fatigue of spacesuit glove.Method Twelve females and forteen males in two groups served as the subjects and participated in the experiments of changeless force fatigue,including gripping,pinching and screwing,and took part in the nondimensional force fatigue.Result Manual performance fatigue could be fully evaluated based on gripping,pinching and screwing.The nondimensional force fatigue had widely applied ranges and well veracity.The combination of nondimensional subjective and objective evaluations was the optimal fatigue evaluation method.Conclusion The results can provide the feasible methods for performance evaluation of spacesuit glove system.