Work Rate and Oxygen Uptake Essay example

1288 Words May 10th, 2013 6 Pages
The Relationship Between Work Rate And Oxygen Uptake During Incremental Submaximal Exercise

Oxygen uptake () describes the rate at which oxygen is utilized by tissues (Burton et al, 2004). is determined by heart rate (heart beats each minute), stroke volume (the volume of blood pumped from one ventricle each beat) and arteriovenous oxygen difference (difference in blood-oxygen content between arterial and venous blood). Oxygen is needed for respiration, the chemical process that produces energy in the form of ATP. Several sources agree that oxygen uptake increases linearly with exercise, this is due to the skeletal muscles requirement for more oxygen for the production of more ATP. Hanson et al (1998) measured
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Gas volumes were corrected for standard temperature and pressure, dry (STPD); and were used to calculate . Data collected from the ergometer and incremental tests were then used to calculate work rate (W). These values were plotted on a graph and tested using a one-tailed Pearson moment correlation statistical test.

The results from the study showed that as work rate increased at each increment mean=29.44W, also increases by mean=0.33l.min-1. Increases in were slower between the 2nd and 3rd increments (0.1l.min-1 increase) but it is evident from steeper gradients on the graph (figure 2) the greatest increases are at the beginning and end stages. The results of a one tailed Pearson correlation between and WR were N=4, r=0.973, p=0.008, a significant correlation.

Table 1: Table showing work rate (W), Heart Rate (bpm) and (l.min-1) at each increment Intensity (kg) | Work Rate (W) | Heart Rate (bpm) | (l.min-1) | 1.5 | 88.31 | 95 | 1.7 | 2 | 117.75 | 119 | 2.1 | 2.5 | 147.18 | 140 | 2.2 | 3 | 176.62 | 161 | 2.7 |

Figure 1: Scatter plot of work rate (W) versus (l.min-1)

Figure 1 shows an almost linear relationship between work rate and , in addition this is supported by the Pearson correlation test (r=0.984) which implies that as

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