Senior Honors Projects, 2010-2019

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Date of Graduation

Spring 2018

Document Type


Degree Name

Bachelor of Science (BS)


Department of Kinesiology


Trent A. Hargens

Nicholas D. Luden

Christopher J. Womack


Purpose: Heart rate variability threshold (HRVT) is a clinical parameter used to gain insight into autonomic balance. Various studies have validated the use of cycle ergometers in determining HRVT, although the literature lacks evidence that treadmill use is a viable means of determining this threshold. We examined the repeatability of HRVT occurrence using standard deviation of normal R-R intervals (SDNN), root mean square of successive differences of continuous R-R intervals (RMSSD), and standard deviation of instantaneous beat intervals (SD1) in college aged males using treadmill exercise to see if this is a reliable method of threshold determination.

Methods: Ten healthy, college-aged males underwent two treadmill max tests while heart rate and ventilation data was obtained using a polar V-800 watch and a PARVO metabolic cart, respectively. Paired t-tests were used to compare consistency of average HRVT and VT occurrence between trials, and to find agreement of HRVT and VT occurrence together within trials.

Results: There was no difference between SDNN, RMSSD, SD1, or VT occurrence between trials one and two. There a significant difference between RMSSD and VT and SD1 and VT (P = 0.003 and 0.002, respectively), however there was agreement between SDNN and VT (P = 0.06).

Conclusion: Treadmill modality is a reliable method of finding HRVT in a population of healthy young males. HRVT and VT does not correspond on a treadmill as it has been reported to with cycle ergometry.



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