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Morning exercise mitigates the impact of prolonged sitting on cerebral blood flow in older adults
Copyright policy )Morning exercise mitigates the impact of prolonged sitting on cerebral blood flow in older adults
Preventing declines in cerebral blood flow is important for maintaining optimal brain health with aging. We compared the effects of a morning bout of moderate-intensity exercise, with and without subsequent light-intensity walking breaks from sitting, on cerebral blood velocity over 8 h in older adults. In a randomized crossover trial, overweight/obese older adults ( n = 12, 70 ± 7 yr; 30.4 ± 4.3 kg/m2), completed three acute conditions (6-day washout); SIT: prolonged sitting (8 h, control); EX+SIT: sitting (1 h), moderate-intensity walking (30 min), followed by uninterrupted sitting (6.5 h); and EX + BR: sitting (1 h), moderate-intensity walking (30 min), followed by sitting (6.5 h) interrupted with 3 min of light-intensity walking every 30 min. Bilateral middle cerebral artery velocities (MCAv) were determined using transcranial Doppler at 13 time points across the day. The temporal pattern and average MCAv over 8 h was determined. The pattern of MCAv over 8 h was a negative linear trend in SIT ( P < 0.001), but a positive quadratic trend in EX + SIT ( P < 0.001) and EX + BR ( P < 0.01). Afternoon time points in SIT were lower than baseline within condition ( P ≤ 0.001 for all). A morning dip in MCAv was observed in EX + SIT and EX + BR ( P < 0.05 relative to baseline), but afternoon time points were not significantly lower than baseline. The average MCAv over 8 h was higher in EX + SIT than SIT ( P = 0.007) or EX + BR ( P = 0.024). Uninterrupted sitting should be avoided, and moderate-intensity exercise should be encouraged for the daily maintenance of cerebral blood flow in older adults. The clinical implications of maintaining adequate cerebral blood flow include the delivery of vital oxygen and nutrients to the brain. NEW & NOTEWORTHY This is the first study to measure the combined effects of an exercise bout with breaks in sitting on cerebral blood velocity in older adults. Using frequent recordings over an 8-h period, we have performed a novel analysis of the pattern of cerebral blood velocity, adjusting for concurrent measures of mean arterial pressure and other potential confounders in a linear mixed effects regression.
- University of Western Australia Australia
- University of Michigan–Flint United States
- University of British Columbia Canada
- Halmstad University Sweden
- Turku PET Centre Finland
Microsoft Academic Graph classification: medicine.medical_specialty Overweight Sitting Internal medicine medicine.artery medicine Morning business.industry Crossover study Transcranial Doppler Blood pressure Cerebral blood flow Middle cerebral artery Cardiology medicine.symptom business
Blood Glucose, Male, brain health, Middle Cerebral Artery, Physiology, Posture, Blood Pressure, Walking, acute exercise, transcranial Doppler, Physiology (medical), Humans, Obesity, Exercise, older adults, Aged, Aged, 80 and over, Sitting Position, Cross-Over Studies, Middle Aged, Overweight, Postprandial Period, Cerebrovascular Circulation, Female, Sedentary Behavior, Research Article
Blood Glucose, Male, brain health, Middle Cerebral Artery, Physiology, Posture, Blood Pressure, Walking, acute exercise, transcranial Doppler, Physiology (medical), Humans, Obesity, Exercise, older adults, Aged, Aged, 80 and over, Sitting Position, Cross-Over Studies, Middle Aged, Overweight, Postprandial Period, Cerebrovascular Circulation, Female, Sedentary Behavior, Research Article
Microsoft Academic Graph classification: medicine.medical_specialty Overweight Sitting Internal medicine medicine.artery medicine Morning business.industry Crossover study Transcranial Doppler Blood pressure Cerebral blood flow Middle cerebral artery Cardiology medicine.symptom business
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Citations provided by BIP!Popularity provided by BIP!- National Health and Medical Research Council (NHMRC) (NHMRC)
- 1062338
- Project Grants
- University of Western Australia Australia
- University of Michigan–Flint United States
- University of British Columbia Canada
- Halmstad University Sweden
- Turku PET Centre Finland
- Baker IDI Heart and Diabetes Institute Australia
- Curtin University Australia
- Australian Catholic University Australia
- University of Turku Finland
- Lakehead University Canada
- University of Northern British Columbia Canada
- University of Melbourne Australia
- University of Hong Kong China (People's Republic of)
Preventing declines in cerebral blood flow is important for maintaining optimal brain health with aging. We compared the effects of a morning bout of moderate-intensity exercise, with and without subsequent light-intensity walking breaks from sitting, on cerebral blood velocity over 8 h in older adults. In a randomized crossover trial, overweight/obese older adults ( n = 12, 70 ± 7 yr; 30.4 ± 4.3 kg/m2), completed three acute conditions (6-day washout); SIT: prolonged sitting (8 h, control); EX+SIT: sitting (1 h), moderate-intensity walking (30 min), followed by uninterrupted sitting (6.5 h); and EX + BR: sitting (1 h), moderate-intensity walking (30 min), followed by sitting (6.5 h) interrupted with 3 min of light-intensity walking every 30 min. Bilateral middle cerebral artery velocities (MCAv) were determined using transcranial Doppler at 13 time points across the day. The temporal pattern and average MCAv over 8 h was determined. The pattern of MCAv over 8 h was a negative linear trend in SIT ( P < 0.001), but a positive quadratic trend in EX + SIT ( P < 0.001) and EX + BR ( P < 0.01). Afternoon time points in SIT were lower than baseline within condition ( P ≤ 0.001 for all). A morning dip in MCAv was observed in EX + SIT and EX + BR ( P < 0.05 relative to baseline), but afternoon time points were not significantly lower than baseline. The average MCAv over 8 h was higher in EX + SIT than SIT ( P = 0.007) or EX + BR ( P = 0.024). Uninterrupted sitting should be avoided, and moderate-intensity exercise should be encouraged for the daily maintenance of cerebral blood flow in older adults. The clinical implications of maintaining adequate cerebral blood flow include the delivery of vital oxygen and nutrients to the brain. NEW & NOTEWORTHY This is the first study to measure the combined effects of an exercise bout with breaks in sitting on cerebral blood velocity in older adults. Using frequent recordings over an 8-h period, we have performed a novel analysis of the pattern of cerebral blood velocity, adjusting for concurrent measures of mean arterial pressure and other potential confounders in a linear mixed effects regression.