|
Exercise intensity refers to how much energy is expended when exercising. Perceived intensity varies with each person. It has been found that intensity has an effect on what fuel the body uses and what kind of adaptations the body makes after exercise. Intensity is the amount of physical power (expressed as a percentage of the maximal oxygen consumption) that the body uses when performing an activity. For example, exercise intensity defines how hard the body has to work to walk a mile in 20 minutes.〔The President's Council on Physical Fitness and Sports - Publications. (n.d.). President's Council on Fitness, Sports & Nutrition . Retrieved April 5, 2011, from http://www.fitness.gov/fitness.htm〕 ==Measures of Intensity== Heart Rate is typically used as a measure of exercise intensity.〔VO2max: what do we know, and what do we still need to know Levine, B.D. Institute for Exercise and Environmental Medicine, Presbyterian Hospital of Dallas, TX 75231. The Journal of Physiology, 2008 Jan 1;586(1):25-34. Epub 2007 Nov 15.〕 Heart rate can be an indicator of the challenge to the cardiovascular system that the exercise represents. The most precise measure of intensity is oxygen consumption (VO2). VO2 represents the overall metabolic challenge that an exercise imposes. There is a direct linear relationship between intensity of aerobic exercise and VO2. Our maximum intensity is a reflection of our maximal oxygen consumption (VO2 max). Such a measurement represents a cardiovascular fitness level.〔Vehrs, P., Ph.D. (2011). Physical activity guidelines. In Physiology of exercise: An incremental approach (pp. 351-393). Provo, UT: BYU Academic Publishing.〕 VO2 is measured in METs (mL/kg/min). One MET, which is equal to 3.5 ml/kg per minute, is considered to be the average resting energy expenditure of a typical human being. Intensity of exercise can be expressed as multiples of resting energy expenditure. An intensity of exercise equivalent to 6 METs means that the energy expenditure of the exercise is six times the resting energy expenditure.〔Vehrs, P., Ph.D. (2011). Physical activity guidelines. In Physiology of exercise: An incremental approach (pp. 351-393). Provo, UT: BYU Academic Publishing.〕 Intensity of exercise can be expressed in absolute or relative terms. For example, two individuals with different measures of VO2 max, running at 7 mph are running at the same absolute intensity (miles/hour) but a different relative intensity (% of VO2 max expended). The individual with the higher VO2 max is running at a lower intensity at this pace than the individual with the lower VO2 max is.〔Vehrs, P., Ph.D. (2011). Physical activity guidelines. In Physiology of exercise: An incremental approach (pp. 351-393). Provo, UT: BYU Academic Publishing.〕 Some studies measure exercise intensity by having subjects perform exercise trials to determine peak power output, which may be measured in watts, heart rate, or (on a cycle) average cadence (cycling). This approach attempts to gauge overall workload. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Exercise intensity」の詳細全文を読む スポンサード リンク
|