The limits of endurance exercise
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A skeletal design which favours running and walking, including the greatest ratio of leg length to body weight of any mammal; the ability to sweat and so to exercise vigorously in the heat; and greater endurance than all land mammals other than the Alaskan Husky, indicates that humans evolved as endurance animals. The development of tools to accurately measure time and distance in the nineteenth century inspired some humans to define the limits of this special capacity. Beginning with Six-Day Professional Pedestrian Races in London and New York in the 1880s, followed a decade later by Six-Day Professional Cycling Races – the immediate precursor of the first six-day Tour de France Cycliste race in 1903, which itself inspired the 1928 and 1929 4,960 km “Bunion Derbies” between Los Angeles and New York across the breadth of the United States of America – established those unique sporting events that continue to challenge the modern limits of human endurance.
But an analysis of the total energy expenditure achieved by athletes competing in those events establishes that none approaches those reached by another group – the explorers of the heroic age of polar exploration in the early twentieth century. Thus the greatest recorded human endurance performances occurred during the Antarctic sledding expeditions led by Robert Scott in 1911/12 and Ernest Shackleton in 1914/16.By man-hauling sleds for 10 hours daily for approximately 159 and 160 consecutive days respectively, members of those expeditions would have expended close to a total of 1,000,000 kcal. By comparison completing a Six-Day Pedestrian event (55,000 kcal) or the Tour de France (168,000 kcal), or cycling (180,000 kcal) or running (340,000 kcal) across America, requires a considerably smaller total energy expenditure.
Thus the limits of human endurance were set at the start of the twentieth century and have not recently been approached. Given good health and an adequate food supply to prevent starvation and scurvy, these limits are set by the mind, not by the body. For it is the mind that determines who chooses to start and who best stays the distance.
Key wordswords humans energy expenditure polar exploration cycling running psychology mind
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- 1.Berry H (1990) From LA to New York, from New York to L.AH, Berry, ChorleyGoogle Scholar
- 3.Cherry-Garrard A (1989) The worst journey in the world. Carroll and Graf, New YorkGoogle Scholar
- 4.Foster C, Foster D (2005) Speaking with earth and sky. David Phillips Publishers, Cape TownGoogle Scholar
- 6.Gordon B, Baker JC (1929) Observations on the apparent adaptability of the body to infections, unusual hardships, changing environment and prolonged strenuous exertion. Am J Med Sci 178:1–8Google Scholar
- 7.Heacox K (1999) Shackleton: The Antarctic Challenge. National Geographic, Washington, DCGoogle Scholar
- 8.Heinrich B (2001) Racing the antelope. Harper Collins Publishers Inc., New YorkGoogle Scholar
- 10.Huntford R (1981) The last place on earth. Pan Books Ltd, LondonGoogle Scholar
- 11.Jeukendrup AE (2002) High Performance Cycling. In: Jeukendrup AE (ed) Human Kinetics Publishers, ChampaignGoogle Scholar
- 14.Messner R (1979) Everest: Expedition to the Ultimate. Kaye and Ward, LondonGoogle Scholar
- 16.Noakes TD (2003) Lore of running. Human Kinetics Publishers, Champaign, ILGoogle Scholar
- 21.Shackleton E (1999) South: journals of his last expedition to Antarctica. Konecky and Knoecky, Old Saybrook, CTGoogle Scholar
- 22.Shackleton E (1999) The heart of the Antarctic. Carroll and Graf Publishers Inc., New York, NYGoogle Scholar
- 23.Solomon S (2001) The coldest march. Yale University Press, New HavenGoogle Scholar
- 30.Stroud MA, Ritz P, Coward WA et al. (1997) Energy expenditure using isotope- labelled water (2H218O), exercise performance, skeletal muscle enzyme activities and plasma biochemical parameters in humans during 95 days of endurance exercise with inadequate energy intake. Eur J Appl Physiol Occup Physiol 76:243–252PubMedCrossRefGoogle Scholar
- 31.Tucker R, Marle T, Lambert EV et al. (2006) The rate of heat storage mediates an anticipatory reduction in exercise intensity during cycling at a fixed rating of perceived exertion. J Physiol (Epub ahead of print)Google Scholar
- 33.Woodland L (2003) The crooked path to victory.Cycle Publishing, San FranciscoGoogle Scholar