A comparison of the heart rate deflection point by the S.Dmax method and the ventilatory threshold in sedentary men

Esbarzadeh, Mehdi; Siahkouhian, Marefat; Bolboli, Lotfali

doi:10.48308/joeppa.2018.98908

A comparison of the heart rate deflection point by the S.Dmax method and the ventilatory threshold in sedentary men

Document Type : original article

Authors

Department of Physical Education & Sport Science, School of Education and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran

10.48308/joeppa.2018.98908

Abstract

Purpose: The aim of this study was to survey of the relationship between heart rate deflection point (HRDP)
by the short distance maximum (S.Dmax) and second ventilatory threshold (VT2).
Methods: Twenty-one sedentary men volunteers (mean age 19.9±1.31 years; height 173.4±5.3 cm; weight
67.9±8.9 kg; maximum oxygen uptake 3.08±0.52 L.min-1
) performed an incremental treadmill exercise test to
exhaustion. To determine the HRDP, each subject heart rate was recorded by using a polar monitor and
analyzed by a designed computer program. Respiratory gases during the exercise test was measured with a
gas analyzing system. Data were analyzed using depended t-test, Bland and Altman plots and intraclass
correlation coefficient.
Results: The HRDP was noticed in all subjects. No significant difference (p > 0.05) between the heart rate, oxygen
uptake, ventilation, tidal volume and respiratory rate corresponding to HRDP and VT2. Also, results of ICC and
Bland-Altman plots showed a good agreement between HR and VO2 measured at the HRDP and VT2.
Conclusions: It could be concluded that S.Dmax method is an accurate and reliable alternative to the expensive
and time-consuming invasive methods. Therefore, the S.Dmax method can be used for the determination of
anaerobic threshold in healthy young men.

Keywords

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