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Am J Public Health. 2009 May;99(5):921-8. doi: 10.2105/AJPH.2007.133165. Epub 2009 Mar 19.

The effect of aerobic training and cardiac autonomic regulation in young adults.

Author information

1
Division of Behavioral Medicine, Department of Psychiatry, Columbia University, 1150 St Nicholas Ave, Suite 121, New York, NY 10032, USA. rps7@columbia.edu

Abstract

OBJECTIVES:

We tested the effect of aerobic exercise on autonomic regulation of the heart in healthy young adults.

METHODS:

Healthy, sedentary young adults (n = 149; age = 30.4 +/- 7.53 years) were randomized to receive 12 weeks of either aerobic conditioning or strength training. Primary outcomes were heart rate and RR interval variability (RRV) measured before and after training and after 4 weeks of sedentary deconditioning. RRV, a noninvasive index of cardiac autonomic regulation, reflects variability in the intervals between consecutive R waves of the electrocardiogram.

RESULTS:

Aerobic conditioning but not strength training led to a significant increase in aerobic capacity (3.11 mL/kg/min), a decrease in heart rate (-3.49 beats per minute), and an increase in high-frequency RRV (0.25 natural log msec2), each of which returned to pretraining levels after deconditioning. Significant 3-way interactions, however, revealed autonomic effects only in men.

CONCLUSIONS:

In sedentary, healthy young adults, aerobic conditioning but not strength training enhances autonomic control of the heart, but post hoc analyses suggested that gender plays a significant role in this exercise-related cardioprotection.

PMID:
19299682
PMCID:
PMC2667843
DOI:
10.2105/AJPH.2007.133165
[Indexed for MEDLINE]
Free PMC Article

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