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1994 Publications

Relationship Of Type Of Sports Training To 24-Hour Heart Rate Variabilityby A. Lazoglu*, P. Fratellone*, B. Glace, G.W. Gleim, FACSM, N.L. Coplan.NISMAT and Cardiology Sect, Lenox Hill Hosp. N.Y., N.Y. - last modified 2013-02-09 00:00
Med. Sci. Sports Exerc., Vol. 26(5):s, 1994.


Heart rate variability (HRV) in either the time or frequency domain is thought to reflect autonomic variability. As autonomic tone is affected by physical training, we explored the influence of different types of physical training on HRV during the course of one day without exercise. Sedentary controls (SC, n = 10), weight lifters (WL, n = 10) and cyclists (C, N = 12) were measured for VO2max during cycle ergometry and HRV during 24 hour Holter monitering.

One-way ANOVA followed by Scheffe's was used for statistics. C had significantly (P < .01) greater VO2max than WL who were in turn significantly higher (P < .05) than SC (65.4 +/- 1.6 vs 44.7 +/- 2.4 vs 34.2 +/- 1.6 ml/kg/min, respectively. Baseline blood pressure did not differ between groups nor did mean 24-hour heart rate. However, mean 24-hour heart rate was related inversely to VO2max across the entire sample (r = -.51. P = .003).

The standard deviation of the R-R interval was greater in cyclists, but did not attain statistical significance (P = .34). Similarly, in the frequency domain, total power did not differ significantly between groups (P = .42). The components of total power, high frequency, (> .15 - .40Hz) and low frequency, (.04 - .15Hz) did not differ significantly between groups (P = .48 and P = .53, respectively). VO2max did not correlate significantly with the standard deviation of the R-R interval (r = .41, P = .02).

Therefore, 24-hour HRV as determined in the frequency domain appears to be independent of the type of exercise training or degree of aerobic fitness. HRV as determined in the time domain is related to the degree of aerobic fitness.