The relationship between resting heart rate variability and heart rate recovery from exercise in college-aged men

Graduation Date

2014

Document Type

Thesis

Program

Other

Program

Thesis (M.S.)--Humboldt State University, Kinesiology, 2014

Committee Chair Name

Tina M. Manos

Committee Chair Affiliation

HSU Faculty or Staff

Keywords

Heart rate recover, Physical fitness, Parasympathetic, Exercise test, College aged males, Heart rate control, Vagal, Heart rate, Variability, Cardiovascular, College aged men, Autonomic, Humboldt State University -- Theses -- Kinesiology

Abstract

The primary aim of this study was to examine the relationship between resting heart rate variability (HRV) and heart rate recovery (HRR) from exercise with a focus on a previously unstudied vagal index of HRR, T30. Participants were males aged 18 to 25 years (N = 23) of varying fitness levels. It was hypothesized that resting HRV would be significantly correlated with HRR. Resting HRV was measured for 5 minutes in the supine and seated positions and was assessed in the time (i.e., SDNN) and frequency (i.e., HF power, normalized HF power [HFnu], LF power, normalized LF power [LFnu], and LF:HF ratio) domains. Two indices of HRR, T30 (i.e., the negative reciprocal of the slope of the regression line of natural log of the HR data for 30 seconds after exercise) and delta 60 (i.e., HR at the end of exercise minus HR at 1 minute of recovery), were each assessed during a passive recovery following submaximal exercise tests on a cycle ergometer. A logarithmic transformation was applied to variables that violated normality. Pearson product correlations were used to assess the relationship between HRV and HRR measures. With the exception of a significant negative correlation between LogT30 and LogLF (supine) (r = -.45, p = .032) no other significant relationships were found between indices of HRV and HRR. Therefore, resting HRV may not be related to HRR from exercise. It is possible that HRV and HRR assess different aspects of autonomic control. It is also possible that there is a physiologic ceiling in HRV and/or HRR due to fitness and/or training.

https://scholarworks.calstate.edu/concern/theses/5x21th85x

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