Inefficiency of Anaerobic Work When work is first started it is carried on in a partly anaerobic condition. In light and moderate work this lag in the increasing rate of oxygen consumption in initial stages of work is slightly less than the lag in the decreasing rate of oxygen consumption after the work has stopped. A consequence of this post-exercise deficit plus "interest" is that the efficiency of short periods of work is lower than the efficiency of work of longer duration. In very brief and heavy exertion the anaerobic part of the work is greater than in moderate exertion and the oxygen consumption after the exercise may be 20 times that consumed during the work. Hence very severe work, which is performed mainly anaerobically with a subsequent aerobic recovery, may be as little as 40 per cent as efficient as aerobic work. ENERGY REQUIRED BY A 154 POUND MAN FOR VARIOUS PHYSICAL ACTIVITIES ACTIVITY  TOTAL CALS./HR.   Sleeping  70   Lying quietly  80   Sitting  100   Mental work,seated  105   Standing  110   Seamstress, hand work  115   Singing  120   Driving a car  140   Office work  145   Housekeeping  150   Calisthenics  160   Walking 2 m.p.h  170   Piloting an airplane  175   Walking up stairs 1 m.p.h  180   Riding a bicycle 5.5 m.p.h  190   Walking down stairs 2 m.p.h  200   Brick laying  205   House painting  210 Carpenter work  230   Billiards  235   Pitching horseshoes  240   Dancing, moderate  250   Swedish gymnastics  260   Laundress work  270   Baseball (except pitcher)  280   Horizontal walking 3.5 m.p.h  290   Rowing for pleasure  300   Wand drill  310   Dancing, vigorous  340   Table tennis  345   Horizontal walking, 3 m.p.h, carrying 43 lb. load  350   Walking up 3% grade at 3.5 m.p.h  370   Baseball pitcher  390   Pick and shovel work  400   Shoveling sand  405   Swimming breast stroke 1 m.p.h  410   Bicycle riding, rapid  415   Swimming crawl stroke 1 m.p.h  420   Walking up 8.6% grade at 2.4 m.p.h  430   Chopping wood  450   Skating 9 m.p.h  470   Sawing wood  480   Swimming breast stroke 1.6 m.p.h  490   Swimming back stroke 1 m.p.h  500   Snowshoeing (bearpaw) 2.5 m.p.h  520   Skiing 3 m.p.h  540   Swimming side stroke 1 m.p.h  550   Walking up 8.6% grade at 3.5 m.p.h  560   Walking up 10% grade at 3.5 m.p.h  580   Walking up stairs 2 m.p.h  590   Mountain climbing  600   Snowshoeing (trail snowshoes} 2.5 m.p.h  620   Fencing  630   Skating 11 m.p.h.  640   Rowing 3.5 m.p.h  660   Walking up 36% grade at 1 m.p.h, carrying 43 lb. load  680   Swimming crawl stroke 1.6 m.p.h  700   Parallel bar work  710   Horizontal running 5.7 m.p.h  720   Walking up 14.4% grade at 3.5 m.p.h  740   Walking in 12-18 in. snow  760   Skating 13 m.p.h.  780   Wrestling  790   Swimming back stroke 1.6 m.p.h.  800   Horizontal running 5 m.p.h, carrying 43 lb. load  820   Horizontal running 7 m.p.h  870   Walking up 36% grade at 1.5 m.p.h. carrying 43 lb. Load  890   Running up 8.6% grade at 7 m.p.h.  950   Rowing 11 m.p.h.  970   Football  1000   Rowing 11.3 m.p.h.  1130   Swimming side stroke 1.6 m.p.h.  1200   Horizontal running 11.4 m.p.h.  130   Rowing 12 m.p.h.  1500   Swimming crawl stroke 2.2 m.p.h.  1600   Swimming breast stroke 2.2 m.p.h.  1850   Swimming back stroke 2.2 m.p.h.  2000 Horizontal running 13.2 m.p.h.  2330   Swimming breast stroke 2.4 m.p.h.  2530   Horizontal running 14.8 m.p.h.  2880   Swimming side stroke 2.2 m.p.h.  3000   Swimming breast stroke 2.7 m.p.h.  3690   Horizontal running 15.8 m.p.h.  3910   Horizontal running 17.2 m.p.h.  4740   Horizontal running 18.6 m.p.h.  7790   Horizontal running 18.9 m.p.h.  9480 The oxygen consumptions from which the caloric values in this table have been calculated are only approximations. Variables which must be considered in any interpretation of this table are: size, body type arid age of the subjects; differences between individuals of the same build; physical fitness and skill in the particular activity; nutritional condition; and environmental conditions, whether they help or hinder the individual.		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