Oxygen Deficit and EPOC consumption during steady state exercise
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Oxygen Deficit and EPOC consumption during steady state exercise at low and high intensity. Introduction: Previous research has shown that in the transition from rest to light or moderate exercise, The body's oxygen requirements increase the moment exercise begins and reaches steady state within 1-4 mins, depending on factors such as intensity of the exercise and participants training status (Powers and Howley, 1994; Martin, 1974). Therefore because oxygen requirements and oxygen supply differ during the transition from rest to exercise, the body incurs an oxygen deficit. (Powers and Howley, 1994) described the term 'oxygen deficit' to apply to the delay in oxygen uptake at the beginning of exercise, and has been defined as the difference between oxygen uptake in the first few minutes of exercise and an equal time period after steady state has been obtained. Figure 1. This table shows EPOC and Oxygen Deficit. Krogh and Lindhard (1919) stated that the deficit at the beginning of exercise and recovery oxygen after exercise were essentially equal in size. Hill and Lupton (1923), stated that during the initial minutes of recovery, even though your muscles are no longer actively working, oxygen demands do not immediately decrease. Instead, oxygen consumption remains elevated temporarily. This consumption, which exceeds that usually required when at rest, has traditionally been referred to as oxygen debt. Contemporary theory no longer uses this term. Instead, recovery oxygen uptake or excess post-exercise oxygen consumption (EPOC)
was greater than O2 (1.6litres ?0.5) deficit when at low intensity exercise. There is no consistence in relationship between O2 deficit and EPOC. There is a significant difference of P<0.024 for O2 deficit during exercise, however there is no significant difference for EPOC (P<0.414). Figure 5. Mean values of Oxygen Deficit and EPOC consumption at Low and High intensity exercise. Discussion: Results from this study suggest that O2 deficit, EPOC, body temperature, VO2 consumption all increase with high intensity exercise compared to that of low intensity exercise. O2 deficit at low intensity had a group mean of 1.59litres(?0.45) whereas high intensity exercise has a group mean of 3.78 litres (?2.17). The O2 deficit had a significant difference of P<0.009528508, this deficit increased during exercise due to the increased demand exerted on the body. Previous research supports the data collected for O2 deficit, (Powers and Howley, 1994; Martin, 1974; Katch, et al 2001) stated oxygen requirements increase the moment exercise begins, and reaches steady state depending on intensity and the participants personal fitness. High intensity exercise would mean the body's oxygen requirements would increase significantly the moment exercise began, moderate-to-heavy aerobic exercise requires a larger time to reach steady rate, which creates a larger oxygen deficit than less-intense exercise. EPOC at low intensity had a group mean of 2.3litres (? 1.4) whereas high intensity exercise has a group mean of 2.7 litres (? 1.0). The EPOC had no significant difference (P<0.423716921).
The results show that VO2 increased markedly on the high intensity exercise compared to that of the low, with significant differences at certain points of the exercise (please refer to results). This is supported by Bahr & Segersted (1991), Brehm & Gutin (1986), Gore and Withers (1990b) and Naughton & Smith (1993) who reported that a threshold exists, between 50% and 75% VO2 max, where exercise begins to significantly increase EPOC. The HR of the participants will be greater in the high intensity due to the body requiring more oxygen via the blood. In this study HR had significant difference of P<0.00 for HR during exercise, and there is a significant difference of P<0.01 for HR during recovery. The results show that HR increased on both intensities, but significantly on the high intensity. Results (continued) Rest During Exercise Post Recovery Heart Rate (bpm) (Low Intensity) 85.5 (?9.3) 123.9 (?12.7) 92.4 (?14.3) Heart Rate (bpm) (High Intensity) 85.8 (?8.8) 165.8 (?7.8) 116.1 (?11.8) Table 2. The mean (?SD) of Heart Rate at Low and High intensity exercise. Rest Post Exercise Post Recovery Temperature ?C (Low Intensity) 36.3 (?0.7) 36.8 (?0.8) 36.4 (?1.0) Temperature ?C (High Intensity) 36.6 (?0.4) 36.9 (?1.1) 36.7 (?1.1) Table 3. The mean (?SD) of Body temperature at Low and High intensity exercise. Oxygen Deficit (litres) EPOC (litres) Low Intensity 1.6 (? 0.5) 2.3 (? 1.4) High Intensity 3.8 (? 2.2) 2.7 (? 1.0) Table 4. The mean (?SD) of Oxygen Deficit and EPOC consumption at Low and High intensity exercise.
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