The Work Rate Divided to Heart Rate Ratio during an Incremental Exercise Test is an Effective Method for Estimation of Anaerobic Threshold

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Objective: The effectiveness of work rate divided to heart rate ratio on anaerobic threshold (AT) estimation was evaluated. Material and Method: Twenty five male subjects performed an incremental exercise test (15 W/min) until the limit of tolerance. During exercise, respiratory and gas exchange parameters were evaluated breath-by-breath. The heart rate was recorded as beat-by-beat. AT estimated from the work rate divided to heart rate ratio, heart rate versus work rate plot (Conconi method) and compared with the V-slope method. Results: A deviation from linearity in heart rate was observed only in 6 subjects. Other 19 subjects have linear increase in heart rate to work rate relationships. The work rate divided to heart rate ratio showed a clear break point in all subjects and closely associated with the V-slope break point: 1.91±0.04 L/min vs 1.89±0.03 L/min. Absent of a break point in heart rate work rate relationship (76%) and an extremely low percent of association in AT estimation between Conconi and V-slope method (%16) may reduce reliability of Conconi test. Conclusion: Thus, caution should be taken by investigators especially making important decision for patients and sports training. However, work rate to heart rate ratio could provide easy and reliable AT estimation

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Anaerobic threshold , heart rate , conconi method , exercise , V , slope

Fırat University Medical Journal Of Health Sciences

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Fırat University Medical Journal Of Health Sciences