Low Economy of Slow Work The reason for the low economy of progression at a slow rate is that a large part of the energy used during the work is required for the maintenance of body functions (digestive, glandular, etc.) When the distance is traversed in a shorter time, the energy cost of maintenance of these supportive functions is correspondingly reduced. The 1 mile climb at 0.5 m.p.h. requires 2 hours. At 1.5 m.p.h. the climb can be completed in 40 minutes. At the slow rate of work the energy cost of maintaining the human machine must be met for 80 minutes longer than at the faster rate of work. This increased energy cost, amounting to 145 Calories, reduces the work efficiency from 24 per cent to 6 per cent. A dominant factor in human efficiency is the time spent in performing the work. The longer the work period, the lower the efficiency. In order to achieve the highest efficiency, work should be performed at the most rapid rate within the limits of skill and endurance. Influence of Work Load on Efficiency An additional factor in work efficiency as shown in Table VIII is the work load. When the speed was increased from 0.5 to 1.0 m.p.h., the work load was increased by 145,548 foot-pounds per hour and the efficiency improved from 13 per cent to 14 per cent. At 1.5 m.p.h. the work load was 436,444 foot-pounds per hour and the efficiency was 16 per cent. The increase in efficiency as the load is increased demonstrates that the percentage of energy utilized for the work is greater when fairly heavy work is done than when light work is done. Net efficiency, in which the energy cost of recovery is added to the energy cost during work, is lowered as the load of brief bouts of heavy work is increased. The lowered net efficiency is explained on the basis of the increased proportion of lactic debt to the total oxygen debt as work becomes harder, and the low metabolic efficiency of the lactic debt mechanism.		Home Pace Motivation Measures of Endurance Computation of Dietary Requirement Work Efficiency Maximum Steady State Work Inefficiency of Anaerobic Work Estimation of Work Efficiency Efficiency of Grade Climbing Low Economy of Slow Work Maximum Rate of Work Levers of the Body Fatigue and Recovery General Fatigue Symptoms Anxiety State Organic Fatigue Cortical Motor and Sensory Centers Effect of Exercise on Mental Work Visual Fatigue Muscular Fatigue Fatigue Prevention and Recuperation