Cardiorespiratory Fitness

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Cardiorespiratory fitness: Cardiorespiratory fitness (endurance), a component of physical fitness is the ability of the circulatory and respiratory systems to supply oxygen during sustained physical activity. Usually expressed as measured or estimated maximal oxygen uptake (VO2 max). Maximal oxygen uptake (VO2 max ) is the body’s capacity to transport and use oxygen during a maximal exertion involving dynamic contraction of large muscle groups, such as during running or cycling. It is also known as maximal aerobic power and cardiorespiratory endurance capacity (3). Cardiorespiratory fitness is an objective indicator of overall cardiovascular health. Studies reveal significant relationship between increased fitness and decreased cardiovascular…show more content…
Regular aerobic physical activity and exercise have been found to be associated with improved cardiorespiratory fitness . There is dose response relationship between aerobic physical activity level (frequency, intensity, duration and volume) and increase in VO2 max (1,3,9). Various studies have shown that regular physical activity can increase VO2 max by few percent to over 20percent (9). According to the overload principle of training, exercise below a minimum intensity, or threshold, will not challenge the body sufficiently to result in increased VO2 max (1,33–35). Evidence for a minimum threshold of intensity for benefit is supported in many studies, but not all, and the lack of consistent findings seems to be related to the initial state of fitness and/or conditioning of the subjects (1,33,33,36). For cardiovascular fitness, American College of Sports Medicine and the World Health Organisation recommend healthy adults a minimum of 150 minutes of moderate intensity aerobic physical activity throughout the week or a minimum of 75 minutes of vigorous intensity aerobic physical activity throughout the week or an equivalent combination of moderate or vigorous intensity activity (1,3). Aerobic activity should be performed in bouts of at least 10 minutes duration (3). Improvement in VO2 max is directly related to frequency, intensity and duration of training.(33,37–47). Depending upon the quantity and quality of training, improvement in VO2 max ranges from 10% to 30%.

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