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KMID : 0438219720090020145
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Korea University Medical Journal
1972 Volume.9 No. 2 p.145 ~ p.156
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Energy Cost of Loads Carried on the Hand, Back and Head in College Girl Students
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Abstract
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Oxygen consumption, pulmonary ventilation and heart rate were measured on 14 college girls (average age: 18.5 years) walking on a treadmill carrying a load of 7.8 kg either on hand, back, or head. The speed of walking was 4, 5, and 5.5 km/hr with zero grade. Comparisons were made between free walking without load and walking with various types of loads carrying. The following results were obtained.
1. Oxygen consumption in resting state was 174±89 ml/min, 3.59±0.99 ml/kg/min, or 4.73±1.20 ml /kg LBM/min.
2. Oxygen consumption in free walking without load was the smallest as compared to the walking with various types of loads carrying. Oxygen consumption in free walking at the speed of 4,5 and 5.5 km/hr was 525±181, 633±145, and 706±166 ml/min, respectively. On the body weight basis it was 10.85±3.71, 13.08±2.97 and 14.66±3.33 ml/kg, respectively.
3. Oxygen consumption in hand load was the greatest as compared to the walking with the other type of load. Namely, oxygen consumption at the speed of 4,5 and 5.5 km/hr was 673149, 768±167 and 843±108 ml/min, respectively. On the body weight basis the values were 13.94±3.12, 16.17±3.57 and 17.39±2.06 ml/kg, respectively.
4. Oxygen consumption in walking with a load on back was the smallest as compared to the walking with the other type of load. Oxygen consumption in walking with a load on back at the speed of 4, 5, and 5.5 km/hr was 12.084.11, 14.733.16, and 15.192.83 ml/kg, respectively.
5. Oxygen consumption in walking with a load on head at the speed of 4, 5 and 5.5 km/hr was 13.18±3.21, 13.60±2.48 and 13.43±2.31 ml/kg, respectively. The oxygen consumption in the order of magnitude was hand load, head load, and back load walking.
6. Oxygen consumption increased as the speed of treadmill increased in free walking without a load, walking with a load on hand, and on back. On head load walking, however, this trend was not manifest.
7. The changes in pulmonary ventilation and heart rate followed the same pattern as the oxygen consumption when speed of walking and types of loads changed. Pulmonary ventilation ranged between 17.52 and 26.851/min and heart rate ranged between 102 and 124 beats/min.
8. Number of strides per minute ranged between 116 and 130 strides/min. It was greatest in hand load walking and smallest in back load walking and the value of head load walking was in the middle.
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