LACTIC THRESHOLD VS VENTILATORY THRESHOLD DURING A RAMP TEST ON A CYCLE ERGOMETER

Objective, The purpose of this investigation was to study the relation ship between the lactate (LT) and the ventilatory threshold (VT) durin g a ramp protocol in cycle ergometry, Participants. Thirty nine traine d male subjects were selected as subjects. Experimental design, All th e subjects performed a maximal ergometric test on a cycle ergometer co nsisting of a ramp protocol (increases of 25 W.min(-1)). The anaerobic threshold (AT) was determined using both ventilatory gas analysis (VT ) and lactate measurement (LT), All the data related to the VT and LT were expressed in work rate (W), (V) over dot O-2 (ml.kg(-1).min(-1)) and heart rate (bpm) and expressed as mean and standard deviation, Lac tate threshold (LT) and ventilatory threshold (VT) were compared using the Student's ''t'' test for paired data, Correlation coefficients be tween both variables were also calculated, Statistical significance wa s accepted at the 5% level, Results, Results showed significant differ ences (p<0.05) between mean values of VT and LT when both expressed ei ther as heart rate (bpm), work rate (W), or (V) over dot O-2 (ml kg(-1 ).min(-1)). Conclusions. It was concluded that LT and VT occur at diff erent exercise intensities during ramp protocol exercise on a cycle er gometer.