Journal of Exercise Science & Fitness
Volume 7, Issue 2, Supplement , Pages S42-S50, 2009

Timing of Exercise Within the Waking Period Does Not Alter Blood Pressure During Subsequent Nocturnal Sleep in Normotensive Individuals

  • Helen Jones

      Affiliations

    • Corresponding Author InformationCorresponding Author Helen Jones, Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Henry Cotton Campus, Webster Street, Liverpool L3 2ET, UK. Tel: (44) (0)151 231 4120, Fax: (44) (0)151 231 4353
    • ,
  • Keith George
    • ,
  • Greg Atkinson

Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK

Article Outline

Exercise can cause a reduction in blood pressure (BP) that is prolonged enough to extend into nocturnal sleep. This post-exercise hypotension has been found to be less apparent in the morning when the immediate (during the 20 minutes after exercise) responses are considered. However, it is currently unknown if the timing of exercise (morning vs. afternoon) mediates different BP responses during a longer follow-up period of everyday habits and nocturnal sleep. Therefore, we aimed to examine BP for up to 24 hours following exercise in the morning and afternoon. After 45 minutes of supine rest, 12 male normotensives completed 30 minutes of cycling at 70% V O2peak, which began at either 08:00 or 16:00 hours. Between 20 minutes and 24 hours after exercise, ambulatory BP, heart rate and wrist-activity were monitored and compared between trials using general linear models. Participants slept normally at night. Systolic, diastolic and mean arterial BP did not differ between trials from 20 minutes after exercise until nocturnal sleep onset (p > 0.23) or during the nocturnal sleep period (p > 0.20). During the daytime period, heart rate was 5 beats·min−1 higher following morning exercise compared with the afternoon trial (p = 0.05), and physical activity was also greater following morning exercise (p = 0.01). Nocturnal measurements of heart rate and physical activity were unaffected by the timing of exercise (p > 0.63). We conclude that the timing of exercise does not moderate subsequent BP responses during everyday activity and nocturnal sleep in normotensive individuals. These findings suggest that the diurnal variation in BP immediately after exercise is relatively short-lived and does not extend into the nocturnal sleep period.

Keywords:  ambulatory blood pressure , exercise and diurnal rhythm

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References 

  1. Atkinson G , Drust B , George K , Reilly T , Waterhouse J . Chronobiological considerations for exercise and heart disease . Sports Med . 2006;36:487–500
  2. Bird S , Davison R . Physiological Testing Guidelines . Leeds: The British Association of Sport and Exercise Sciences; 1997;
  3. Gretler DD , Carlson GF , Montano AV , Murphy MB . Diurnal blood pressure variability and physical activity measured electronically and by diary . Am J Hypertens . 1993;6:127–133
  4. Hermida RC . Ambulatory blood pressure monitoring in the prediction of cardiovascular events and effects of chronotherapy: rationale and design of the MAPEC study . Chronobiol Int . 2007;24:749–775
  5. Jones H , Atkinson G , Leary A , George K , Murphy M , Waterhouse J . The reactivity of ambulatory blood pressure to physical activity varies with time of day . Hypertension . 2006;47:778–784
  6. Jones H , George K , Edwards B , Atkinson G . Effects of time of day on post-exercise blood pressure: circadian or sleep-related influences? . Chronobiol Int . 2008;25:987–998
  7. Jones H , Pritchard C , George K , Edwards B , Atkinson G . The acute post-exercise response of blood pressure varies with time of day . Eur J Appl Physiol . 2008;104:481–489
  8. Jones H , Pritchard C , George K , Edwards B , Atkinson G . Exercise intensity and blood pressure during sleep . Int J Sports Med . 2009;30:94–99
  9. Kenney MJ , Seals DR . Postexercise hypotension. Key features, mechanisms and clinical significance . Hypertension . 1993;22:653–664
  10. Leary AC , Struthers AD , Donnan PT , MacDonald MT , Murphy MB . The morning surge in blood pressure and heart rate is dependent on levels of physical activity after waking . J Hypertens . 2002;20:865–870
  11. MacDonald JR . Potential causes, mechanisms, and implications of post exercise hypotension . J Hum Hypertens . 2002;16:225–236
  12. Middelkoop HA , van Dam EM , Smilde-van den Doel DA , Van Dijk G . 45-hour continuous quintuple-site actimetry: relations between trunk and limb movements and effects of circadian sleep-wake rhythmicity . Psychophysiology . 1997;34:199–203
  13. Millar-Craig MW , Bishop CN , Raftery EB . Circadian variation of blood pressure . Lancet . 1978;1:795–797
  14. Muller JE . Circadian variation in cardiovascular events . Am J Hypertens . 1999;12:35S–42S
  15. Muller JE , Tofler GH , Stone PH . Circadian variation and triggers of onset of acute cardiovascular disease . Circulation . 1989;79:733–743
  16. O'Brien E, Asmar R, Beilin L, Imai Y, Mancia G, Mengden T, et al. Practice guidelines of the European Society of Hypertension for clinic, ambulatory and self blood pressure measurement . J Hypertens . 2005;23:697–701
  17. O'Brien E, Petrie J, Littler W, de Swiet M, Padfield PL, O'Malley K, et al. The British Hypertension Society protocol for the evaluation of automated and semi-automated blood pressure measuring devices with special reference to ambulatory systems . J Hypertens . 1990;8:607–619
  18. Parati G . Blood pressure reduction at night: sleep and beyond . J Hypertens . 2000;18:1725–1729
  19. Park S , Jastremski CA , Wallace JP . Time of day for exercise on blood pressure reduction in dipping and nondipping hypertension . J Hum Hypertens . 2005;19:597–605
  20. Pescatello LS, Franklin BA, Fagard R, Farquhar WB, Kelley GA, Ray CA, et al. American College of Sports Medicine position stand. Exercise and hypertension . Med Sci Sports Exerc . 2004;36:533–553
  21. Pickering TG . The influence of daily activity on ambulatory blood pressure . Am Heart J . 1988;116:1141–1145
  22. Sterne JA , Davey Smith G . Sifting the evidence—what's wrong with significance tests? . BMJ . 2001;322:226–231
  23. Whelton SP , Chin A , Xin X , He J . Effect of aerobic exercise on blood pressure: a meta-analysis of randomized, controlled trials . Ann Intern Med . 2002;136:493–503

PII: S1728-869X(09)60022-8

doi:10.1016/S1728-869X(09)60022-8

Journal of Exercise Science & Fitness
Volume 7, Issue 2, Supplement , Pages S42-S50, 2009

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