Estimation of maximal heart rate using the relationship between heart rate variability and exercise intensity in 40-67 years old men.
Large interindividual variation in maximal heart rate (HRmax) may not be accounted for by age alone. In order to evaluate a novel method in the prediction of HRmax, this study examined the profile of HR variability (HRV) during exercise in 40-67 years old men (n = 74). R-R intervals were recorded during supine rest and during a graded exercise test by cycle ergometry until exhaustion. A third-degree polynomial function was fitted to the HRV data recorded during exercise to represent the HRV profile of each subject. The instantaneous beat-to-beat R-R interval variability (SD1), high (HF) and low frequency power decreased between all consecutive exercise intensities (P < 0.033). The relationship between HRmax and a variable illustrating the declining rate of HF (HRHF50%) was stronger (r = 0.50, P < 0.001) than between HRmax and age (r = -0.36, P < 0.01). The regression analysis showed that a more accurate estimation of HR(max) was attained when HRV was used in the equation in addition to age: HRmax = 160.633-0.603(age) + 0.441(HRHF50%) (SEE = 9.8 bpm vs. 11.6 bpm in the equation based on age alone). The decline of HRV during incremental exercise seems to be useful for accurate estimation of maximal heart rate.
Karavirta
Laura
L
Department of Biology of Physical Activity, University of Jyväskylä, PO Box 35, 40014 Jyväskylä, Finland. laura.karavirta@sport.jyu.fi
Tulppo
Mikko P
MP
Nyman
Kai
K
Laaksonen
David E
DE
Pullinen
Teemu
T
Laukkanen
Raija T
RT
Kinnunen
Hannu
H
Häkkinen
Arja
A
Häkkinen
Keijo
K
D000328:Adult; D000368:Aged; D001794:Blood Pressure / Q000502:physiology; D002320:Cardiovascular Physiological Phenomena; D004562:Electrocardiography; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D007773:Lactates / Q000097:blood; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption / Q000502:physiology; D012044:Regression Analysis; D012146:Rest / Q000502:physiology
D007773:Lactates