Effect of Different Exercise Modes on Cardiovascular Responses in Male Runners

The purpose of this study was to examine the cardiorespiratory response and ventilatory efficiency during both incremental cycling and treadmill exercise to volitional exhaustion in runners. Respiratory measures were recorded by ZAN 600 flow handy II medical device. Thirty male runners participated in this study with an average age of 22.77 years (± 3.01), height of 1.75 cm (± 0.06), weight of 70.9 kg (± 6.54) and average body mass index (BMI) of 23.53 kg/m (± 1.5). Each participant performed two modes of exercise on separate days in a 2 randomized order. A one-way analysis of variance (ANOVA) was used to compare the dependent variables during cycling and running. The a level was set at 0.05 for all analyses. The results revealed that, at V , O2max maximum oxygen uptake (V ) was significantly higher in treadmill as compared with cycle ergometer. Runners O2max displayed significantly greater values for minute ventilation (V ) and ratio of minute ventilation to carbo n E dioxide output (V /V ) on the cycle ergometer as compared with treadmill. There were no significan t E CO2 differences in respiratory exchange ratio (RER), maximum carbon dioxide output (V ) and tidal volume (V ) CO2max T between two incremental exercise tests. Finally, ventilatory efficiency did not correlate with the BMI in runners during both treadmill and cycle ergometer testing. It was concluded that, this study provided strong evidence for an association between exercise modality and both V and ventilatory efficiency. O2max