Changes in heart rate circadian rhythm following exercise in middle-aged men

Herbert Jelinek, Chandan Karmakar, A M Kiviniemi, M P Tulppo, T H Makikallio, A L Hautala, H V Huikuri, Ahsan H Khandoker, M Palaniswami

Research output: Book chapter/Published conference paperConference paperpeer-review


Aerobic fitness and exercise have been associated with improved cardiovascular health. Health effects of exercise may be associated with the circadian rhythm of the heart and may specifically reduced the risk of heart attacks during high-risk periods over the 24 hours. Linear and nonlinear heart rate variability (HRV) measures indicate the degree of heart rate modulation by the parasympathetic and sympathetic branches of the autonomic nervous system. Twenty-one sedentary middle-aged men underwent an 8-week moderate volume exercise program and 24-hour heart rate recordings were obtained prior and following the exercise period. Temporal dynamic changes over the 24-hour period were calculated using the complex correlation measure (CCM) derived from the Poincaré Plot and analyzed in 1-hour intervals. The maximum significant differences between pre and post moderate volume exercise were between the morning hours of 8.30 to 9.30 AM (p= 0.011) and in the afternoon between 4.00 and 5.00 PM (p=0.021). In the morning the temporal dynamics (mean ± sd) increased from 0.1±0.02 to 0.15±0.06. In the afternoon period the increase was from 0.11±0.04 to 0.14±0.05. An increase in CCM indicates a more complex temporal dynamics of the heart rate and an improved parasympathetic influence.
Original languageEnglish
Title of host publicationComputing in Cardiology 2015
Subtitle of host publicationVolume 42
EditorsAlan Murray
Place of PublicationUnited States
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages4
ISBN (Electronic)9781509006847
ISBN (Print)9781509006854
Publication statusPublished - 2015
Event42nd Computing in Cardiology Conference, CinC 2015
- Saint Jean d’Angely Campus, University of Nice, Nice, France
Duration: 06 Sept 201509 Sept 2015 (Conference proceedings) (Conference website)

Publication series

ISSN (Print)2325-8861


Conference42nd Computing in Cardiology Conference, CinC 2015
OtherComputing in Cardiology provides an international forum for scientists and professionals from the fields of medicine, physics, engineering and computer science, and has been held annually since 1974.
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