Abstract

Objective: The aim of this study was comparatively investigate respiratory, cardiac and metabolic parameters in the aerobic and anaerobic region of the incremental exercise test. Material and Methods: Total of 24 healthy male (age: 19.7±1.87 years) participated to study. The subjects performed an incremental exercise test with a work rate of 15 W/min to exhaustion. The anaerobic threshold (AT) reflects the onset of metabolic acidosis and separate aerobic to anaerobic exercise reagion was estimated from V-slope method. During exercise, the subjects’ pulmonary gas exchange and metabolic parameters were measured breathby-breath using metabolic gas analyser. Results: The work rate and O2 uptake at maximal exercise and at the AT was found to be 233±30 W and 156±25 W, 2.96±0.28 L/min and 2.02±0.20 L/ min, respectively. O2 uptake was found to be 1.291±0.18 L/min in aerobic region and 0.924±0.16 L/min in anaerobic region (p< 0.001). In contrast, CO2 output was 1.301±0.16 L/min in aerobic region and 1.631±0.31 L/min anaerobic region (p<0.001). The ventilation for each 1 W work rate was found to be 270.8±37 ml in aerobic region and 685.4±180 ml in anaerobic region (p<0.001). In addition, heart rate for each 1 W work rate was 2.61±0.6 beat/W in aerobic region and 2.24±0.5 beat/W in anaerobic region (p<0.03). Conclusion: There was significant differences in O2 uptake, CO2 output and ventilation, heart beat response to exercise in aerobic and anaerobic exercise region. Evaluations of cardiopulmonary and metabolic responses in aerobic and anaerobic region of incremental exercise provide valuable information about the subjects’ fitness status.

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