Cardio-Respiratory Mechanisms

Abstract Whens humans exercise, their oxygen supply needs to be increased in order to produce the energy needed to sustain this workload. Humans will use a variety of cardio-respiratory mechanisms in order to supply and meet the oxygen levels the body needs during exercise. In this study we wanted to see how different individuals respond to exercise, specifically how long they can work and how efficiently they work. We predicted that females who exercise will have a higher relative-VO2, higher a-vO2-difference, higher stroke volume(SV) and higher cardiac output(CO) at their peak work rate; than individuals who do not exercise. In addition, we predict that females who exercise their heart rate(HR) will be lower before and after exercise than in females who do not exercise. These subjects performed high intensity exercises on an ergometer until exhaustion. Cardio-respiratory values were analyzed during and after exercise with specific calculations. All individuals experienced an increase in their cardio-respiratory values. Those who exercised had a significantly higher relative VO2, a-VO2 differences, CO, and SV compared to those who didn 't exercise. While not statistically significant, HR was lower for those who …show more content…
The cardiac output for those who exercise at rest (fig.3) was lower (5.15 L/min) than those who do not (5.9 L/min). When an unpaired t-test was performed, the p-value for this sample was 18 which is above .05 : thus it can be concluded that the change in cardiac output at rest between both groups was not statistically significant and does not support the hypothesis. The cardiac output for those who exercise at peak work rate(fig.3) was higher (19.5 L/min) than those who do not(16.4 L/min) as predicted by the hypothesis.When an unpaired t-test was performed, the p-value for these samples was .0014, therefore statistically