Key result
Bi-segmental linear regression and maximal distance models perform interchangeably for determining heart rate deflection point.
Why the study?
Does the mathematical model used to determine heart rate deflection point (2SEG vs Dmax) affect the relationship with respiratory compensation point and running performance?
Cross-Sectional (n=19)
Does the mathematical model used to determine heart rate deflection point (2SEG vs Dmax) affect the relationship with respiratory compensation point and running performance?
VO2 at the heart rate deflection point may be a better predictor of running performance than heart rate itself, with 2SEG and Dmax models being interchangeable.
International Journal of Exercise Science 10(4): 592-603, 2017. Heart rate deflection point (HRDP) can be determined through different mathematical-modeling procedures, such as bi-segmental linear regression (2SEG) or maximal distance model (Dmax). The purpose was to compare heart rate (HR) and oxygen consumption (VO2) at HRDP when using 2SEG and Dmax, and to examine their relationships with respiratory compensation point (RCP) and running performance. Nineteen participants completed a graded exercise test (GXT), to determine HRDP and RCP, and a 5km treadmill time trial (5Ktime). No differences were found in HR or VO2 when comparing HRDP2SEG, HRDPDmax, and RCP. Strong correlations were found between HRDP2SEG, HRDPDmax, and RCP when using HR and VO2. No relationships were found between 5Ktime and HR at HRDP or RCP; however, strong relationships were found with VO2. While 2SEG and Dmax may be interchangeable in determining HRDP, VO2 at HRDP and RCP yielded stronger relationships to 5Ktime than HR. Therefore, VO2 at HRDP may be a better predictor of running performance than HR.
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Baker et al. (2017) reported a cross-sectional. Bi-segmental linear regression (2SEG) and maximal distance model (Dmax) vs. Respiratory compensation point (RCP) was evaluated on Heart rate (HR) and oxygen consumption (VO2) at heart rate deflection point (HRDP). Bi-segmental linear regression and maximal distance models were interchangeable for determining heart rate deflection point, while VO2 at HRDP was a stronger predictor of 5km running performance.
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