Abstract：
PURPOSE:Increased risk of arrhythmic events occurs at certain times during the circadian cycle with the highest risk being in the second and fourth quarter of the day. Exercise improves treatment outcome in individuals with cardiovascular disease. How different exercise protocols affect the circadian rhythm and the associated decrease in adverse cardiovascular risk over the circadian cycle has not been shown. METHODS:Fifty sedentary male participants were randomized into an 8-week high volume and moderate volume training and a control group. Heart rate was recorded using Polar Electronics and investigated with Cosinor analysis and by Poincaré plot derived features of SD1, SD2 and the complex correlation measure (CCM) at 1-h intervals over the 24-h period. RESULTS:Moderate exercise significantly increased vagal modulation and the temporal dynamics of the heart rate in the second quarter of the circadian cycle (p = 0.004 and p = 0.007 respectively). High volume exercise had a similar effect on vagal output (p = 0.003) and temporal dynamics (p = 0.003). Cosinor analysis confirms that the circadian heart rate displays a shift in the acrophage following moderate and high volume exercise from before waking (1st quarter) to after waking (2nd quarter of day). CONCLUSIONS:Our results suggest that exercise shifts vagal influence and increases temporal dynamics of the heart rate to the 2nd quarter of the day and suggest that this may be the underlying physiological change leading to a decrease in adverse arrhythmic events during this otherwise high-risk period.
journal_name
Eur J Appl Physioljournal_title
European journal of applied physiologyauthors
Jelinek HF,Karmakar C,Kiviniemi AM,Hautala AJ,Tulppo MP,Mäkikallio TH,Huikuri HV,Khandoker AH,Palaniswami Mdoi
10.1007/s00421-015-3185-xsubject
Has Abstractpub_date
2015-10-01 00:00:00pages
2069-80issue
10eissn
1439-6319issn
1439-6327pii
10.1007/s00421-015-3185-xjournal_volume
115pub_type
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