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KMID : 0377619720230040387
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Korean Jungang Medical Journal
1972 Volume.23 No. 4 p.387 ~ p.390
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Fatigue Allowance Rate in Regard to Oxygen Uptake in Different Methods of Load-Carrying
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Abstract
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On 6 healthy male adults aged from 20 to 30, fatigue allowance rate in regard to oxygen uptake (duration of recovery X100/duration of work) was measured after carrying sand bags in 5 different methods, weighing 10 kg, 20 kg and 30 kg on level treadmill running with speeds of 3 km/hr., 4 km/hr. and 5 km/hr.
Methods of load-carrying were as such, carrying on shoulder, on back, on head, in both hand and by embrace.
The results obtained were as follows.
1. The fatigue allowance rate was proportionately increased with work load within a limit of oxygen uptake requiring less than 3. 0 1/min.
2. There was no significant difference in the fatigue allowance rate between methods of carrying a load which required approximately 1. 5 l/min. of oxygen uptake or less.
3. Difference in fatigue allowance rate was recognized between methods of carrying a load which required more than approximately 1. 5 i/min. of oxygen uptake. And the heavier a work load became, the more the difference increased.
4. Regression equations of the fatigue allowance rate (y) on oxygen uptake per minute (x) were expressed as follows for each method of load carrying. On shoulder : y=25. 24x ; 3. 77
On back : y=20.76x±4.78
On head : y=50.23x-28.44 In both hands : y=99.99x-80.49
By embrace : y=93.68x-70.79
Average : y=57.25x-34.60
5. It was concluded that carrying a load on shoulder or on back was the most reasonable method, and on head came next, and in both hands or by embrace was the least economical method physiologically in a view point of the fatigue allowance rate.
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