Arm Crank Ergometry Assignment Example | Topics and Well Written Essays - 2000 words

Arm Crank Ergometry - Assignment Example Previous studies have considered issues linked to exercise efficiency. This line of enquiry provides important information associated with the relationship between the energy required to achieve a given amount of external work. In the context of a competitive athlete or a patient in a clinical setting, exercise efficiency provides a useful insight into functional capacity. When presented in either gross or net terms, exercise efficiency has been shown to increase in line with workload during both cycling and ACE. Several studies have also demonstrated there to be a clear interaction between crank rate and workload with respect to oxygen consumption during cycling and ACE. Additionally, previous studies have considered exercise efficiency in a number of different ways, including the calculation of gross, net, and delta values. Powers et al. (1984) showed that VO2 during ACE increased in line with crank rate. At workloads of 15 and 30W, VO2 was lower and exercise efficiency was higher, using crank rate of 50 and 70 rev.min-1 compared to 90 rev.min-1. Furthermore, when the workloads were increased to 45 and 60W, exercise efficiency remained higher using 50 compared to 90 rev.min-1. ... Furthermore Smith et al. showed that while variations in crank rate (50, 70 and 90 rev.min-1) influenced measures of exercise efficiency a relatively low workloads (30 to 70w) during ACE, these discrepancies did not exist at 90w. These data are interesting as they question the previously reported interaction between crank rate, workload and exercise efficiency. The purpose of this practical will be to further investigate 1) if exercise efficiency parameters change in line with variations in crank rate and 2) to determine whether or mechanical efficiency varies according to the external workload being achieved. In these respects, values of gross, net and work efficiency will be considered. RESULTS. The results of the experiment are summarised in the table 1 in the Annex. You can see that the index FE02 (fractional concentration of oxygen in expired air) was varied in the range between 16.2 and 18.5 ml O2/kg/min (range is 2.3 ml O2/kg/min). Consequently the mean of 35 measurements was equal to 17.1 and its standard error is 0.09. The variance of FE02 gross value was 0.34 and standard deviation - 0.56. The distribution of the sample was asymmetric and not normal (skewness is 0.72 and kurtosis 0.29). The values of median, lower and upper quartile were equal to 17.0, 16.7 and 17.4 correspondingly. The mean value of FECO2 (fractional concentration of CO2-exhaled) was equal to 3.660.08 while the variance and standard deviation was 0.24 and 0.49 respectively. The median of the index was 3.73 and the first (lowest) and third (upper) quartiles were equal to 3.45 and 3.98 while the minimum and maximum were 2.52 and 4.44 (range is 1.92 ml CO2/kg/min). The skewness and kurtosis were not equal to zero thus the distribution was not symmetric. The data