By Stephen Pheasant
Consulting ergonomists, London, U.K.. The position of ergonomics in work-related musculoskeletal issues. For well-being execs operating with sufferers with work-related problems. zero
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Your objective is to get the racquet moving with the maximum possible velocity at the time it hits the ball. You start by "winding yourself up", lengthening all the muscles that will be used in the shot. Then, as the back-swing is approaching completion, you commence the positive phase by "leading with the hips"-that is, you use the muscles of the lower limb to start the pelvis turning. This imposes an additional dynamic stretch on the abdominal muscles, which transfer the momentum of the pelvis to the upper trunk, which is the next part of the body to move-followed in tum by the shoulders, the upper arms and finally the.
The search for a mediating physiological variable, which allegedly enables some people to eat heartily and remain thin, has so far proved inconclusive. But the relationship between caloric intake and energy expenditure is itself complex. In a physically active person, body weight will be to some extent self-regulating-since any weight gain which occurs will be partially offset by an increase in the energy expended in any particular activity. There is evidence, however, that obese people accomplish their everyday activities with a greater economy of effort.
9 Walking (ave. 1 Typical levels of energy expenditure for various aaivities-data from Durnin and Passmore (1967), NIOSH (1981), McArdle et al. (1986) andAstrand and Rodahl (1986) laborious (and potentially hazardous) affair-so reliable figures for the general population are unavailable. 3. A symmetrical distribution about the average value was assumed-see p. 118 for an explanation of the statistical concepts involved. These figures are broadly comparable with those of Astrand (1960). 5 kcaVmin in women (NIOSH, 1981).