engleski

Validity of the Modified Conconi Running Test

The aim of this study was to assess the validity of a fast ramp treadmill protocol for determination of the heart rate deflection point ( DP HR ) and speed of deflection ( DP S ) in trained runners. Fifty-one trained male runners performed a standard (Tstand ; speed increase 1 km· ; ; h-1 every 60 s) and a fast (Tfast ; speed increase 1 km· ; ; h-1 every 30 s) incremental treadmill test until volitional exhaustion. Heart rate was continuously recorded, and the DP HR was estimated after data averaging as the point of deflection in the linear speed/HR relationship. The DP HR and DP S recorded in Tfast were compared with the corresponding values obtained in Tstand by examining the Student’ s t-test, correlation coefficient (r), and limits of agreement (LoA). The DP HR recorded during standard and fast treadmill protocol were highly correlated (r = 0.92, p<0.001) and similar to each other (p = 0.79). In contrast, DP S was highly correlated (r = 0.91, p<0.001), but increased significantly with the faster ramp function (p<0.001). No evidence of systematic bias was evident in the DP HR (95% LoA of 0.2 ± ; ; 7.3 bpm), while a uniform, systematic bias was evident for DP S in the Tfast (95% LoA of 1.6 ± ; ; 1.5 km h-1). We conclude that a fast ramp treadmill protocol (speed increase 1 km· ; ; h- 1 every 30 s) may be used for determination of the DP HR in trained runners, while DP S is protocol dependent and caution is warranted regarding its practical applicability.

heart rate ; anaerobic threshold ; Conconi test ; ramp test ; validity

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