By R. J. Shephard

One of many targets of investigations conducted in the Human Adaptability component to the foreign organic Programme used to be to procure similar facts on inhabitants features over quite a lot of ecosystems. This quantity offers a quick survey of the variables affecting the physiological paintings potential of assorted populations. The goods thought of comprise bodyweight, fatness, greatest oxygen consumption, muscular power, and the method of oxygen delivery from the air to the operating muscle mass. The dialogue is predicated principally on facts amassed lower than the auspices of the IBP, utilizing equipment standardised for the programme. The impression of race, heredity, atmosphere and affliction are thought of, and an in depth research is made from quite a few sessions of athlete. the fabric can be beneficial to human and environmental physiologists, anthropologists, and people drawn to actual schooling.

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Extra resources for Human Physiological Work Capacity (International Biological Programme Synthesis Series)

Sample text

The choice of ergometer was thus distributed rather evenly between mechanically-braked bicycles, usually of the von Dobeln type, and various forms of step. Most authors took the precaution of allowing their subjects one or more familiarization runs, but no formal studies of habituation and test learning were made. Ratings of perceived exertion (Borg, 1971) have shown a remarkably consistent relationship to heart rate in Swedish (Borg & Linderholm, 1967), Canadian (Kay & Shephard, 1969), Israeli (Bar-Or et ai, 1972) and US (Skinner et ai, 1973) populations.

Astrand & Ryhming (1954) actually admitted a 6% coefficient of variation about their mean figure for the efficiency of a relatively homogeneous group of subjects exercising on the bicycle ergometer. The IBP team found a coefficient of variation of 4-5% for young Canadian men while on the bicycle ergometer and only 7 % while stepping; (Shephard, 1966a; Shephard et ai, 1968b); even the cost of uphill treadmill running could be predicted from a nomogram (Shephard, 1969c) with an accuracy of ±10%. 8% in the girls (Shephard et aL, 1968c).

Choice of ergometer With the exception of laboratory tests on city-dwellers and some US studies of Alaskan Eskimos, the treadmill proved impractical for IBP investigations. The choice of ergometer was thus distributed rather evenly between mechanically-braked bicycles, usually of the von Dobeln type, and various forms of step. Most authors took the precaution of allowing their subjects one or more familiarization runs, but no formal studies of habituation and test learning were made. Ratings of perceived exertion (Borg, 1971) have shown a remarkably consistent relationship to heart rate in Swedish (Borg & Linderholm, 1967), Canadian (Kay & Shephard, 1969), Israeli (Bar-Or et ai, 1972) and US (Skinner et ai, 1973) populations.

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