Discuss the validity, reliability and physiological foundations of a test versus a predictive maximal oxygen uptake test. Abstract
The aim of this study was to assess the validity, reliability and physiological underpinnings of an actual VO2max test in comparison to a predictive maximal oxygen uptake test. Eight male subjects with the following physical characteristics, mean and standard deviation age 19.75 ± 0.71 year; weight 72.15 ± 11.93 kg; height 1.77 ± 0.11 m performed an incremental treadmill test (53.24±7.15), starting at 8.km.h-1, increasing by 2.km.h-1 every 3 minutes with a constant increment of 1%. The subject’s heart rate, rating of perceived exhaustion and expired air were collected during the final 60seconds of each 3-minute stage. A multi-stage fitness test (50.17±7.76) was also completed until volitional exhaustion. The subject’s heart rate was taken prior to each test and heart rate and blood lactate were taken post each test. Using a predictive equation (54.14±6.27) the athlete’s VO2max was also calculated. The conclusion of this investigation showed that the multi-stage fitness test under-predicted VO2max results and the predictive equation over-predicted VO2max results, though the multi-stage fitness test was the more relatively accurate form of measurement despite its disregard of body mass. Literature review
There is a plethora literature that discusses the validity reliability and physiological foundations of a predictive Vo2 max testing some areas of which still huge amounts of discussion around (Basset and Howley,. 1997). Vo2 max is the maximal volume of oxygen can be obtained and utilized by the body each minute and is achieved when an athlete participates in an endurance exercise (Quinn,. 2011). It can also be described as Vo2 max is achieved when the work rate is increased, but oxygen consumption (Vo2) does not increase or has reached a plateau (Morcrow et al,. 2000). It is usually expressed in absolute terms as litres of oxygen per minute ( LO2min-1) or in relative terms as millimetres of oxygen per kilogram of body weight per minute (mlO2 kg-1 min-1). VO2 max in absolute terms does not take in to account body weight; a heavy person can be expected to use more oxygen than a lighter person per minute. Doing this places everyone on a scale relative to body weight therefore making the tests for maximal oxygen testing reliable (Fleck and Kraemer,. 1997). When the intensity of the exercise increases oxygen consumption also increases in an exact proportion until a point is reached when it fails to rise despite the increased workload. VO2max is an important variable that sets the upper limit for endurance performance an athlete cannot operate above 100% VO2max, for extended periods (Basset and Howley,. 2000). Aerobic capacity, maximal oxygen uptake or VO2 max is regarded by most as the best single measurement of cardiorespiratory endurance and aerobic fitness. This is because it represents aerobic power and is seen as the best objective laboratory measure of cardiorespiratory endurance capacity (Wilmore et al,. 2008). Studies show that the more oxygen you use during high levels of exercise the more ATP can be produced. This is often the way elite athletes provide a rough guide for high levels of athletic performance (Jones,. 2007). However there are people that disagree for instance Hayward (2002) states that because maximal exercise involves both aerobic and anaerobic components, the VO2 max will be overestimated since the contribution of the anaerobic component is not known . Testing for Vo2 max is an essential way of providing important information about the physical capacity of the cardiovascular, pulmonary and neuromuscular systems of an athlete (Jones and Poole, 2005). There is a lot of debate surrounding why maximal oxygen uptake eventually fails to rise once VO2 max is achieved. This debate is referred to by Basset and Howley as “Classical” verses “Contemporary” viewpoints. In their...
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