Journal
BRITISH JOURNAL OF SPORTS MEDICINE
Volume 54, Issue 13, Pages 776-+Publisher
BMJ PUBLISHING GROUP
DOI: 10.1136/bjsports-2018-100168
Keywords
sedentary; exercise; brain; ageing
Categories
Funding
- National Health and Medical Research Council of Australia [1062338]
- Victorian Government's OIS Program
- University of Western Australia
- Baker Heart and Diabetes Institute
- NHMRC Principal Research Fellowship [APP1080914]
- ARC Future Fellowship [ARC FT140100085]
- University of Turku, Hospital District of Southwest Finland
- Juho Vainio Foundation
- NHMRC Senior Research Fellowship [NHMRC APP1078360, APP1042492]
- Medtronic
- Abbott Pharmaceuticals
- Servier Australia
- Allergan
- National Health and Medical Research Council of Australia [1062338] Funding Source: NHMRC
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Background Sedentary behaviour is associated with impaired cognition, whereas exercise can acutely improve cognition. Objective We compared the effects of a morning bout of moderate-intensity exercise, with and without subsequent light-intensity walking breaks from sitting, on cognition in older adults. Methods Sedentary overweight/obese older adults with normal cognitive function (n=67, 67 +/- 7 years, 31.2 +/- 4.1 kg/m(2)) completed three conditions (6-day washout): SIT (sitting): uninterrupted sitting (8 hours, control); EX+SIT (exercise + sitting): sitting (1 hour), moderate-intensity walking (30 min), uninterrupted sitting (6.5 hours); and EX+BR (exercise + breaks): sitting (1 hour), moderate-intensity walking (30 min), sitting interrupted every 30 min with 3 min of light-intensity walking (6.5 hours). Cognitive testing (Cogstate) was completed at four time points assessing psychomotor function, attention, executive function, visual learning and working memory. Serum brain-derived neurotrophic growth factor (BDNF) was assessed at six time points. The 8-hour net area under the curve (AUC) was calculated for each outcome. Results Working memory net AUC z-score center dot hour (95% CI) was improved in EX+BR with a z-score of +28 (-26 to +81), relative to SIT, -25 (-79 to +29, p=0.04 vs EX+BR). Executive function net AUC was improved in EX+SIT, -8 (- 71 to +55), relative to SIT, -80 (-142 to -17, p=0.03 vs EX+SIT). Serum BDNF net AUC ng/mL center dot hour (95% CI) was increased in both EX+SIT, +171 (-449 to +791, p=0.03 vs SIT), and EX+BR, +139 (-481 to +759, p=0.045 vs SIT), relative to SIT, -227 (-851 to +396). Conclusion A morning bout of moderate-intensity exercise improves serum BDNF and working memory or executive function in older adults, depending on whether or not subsequent sitting is also interrupted with intermittent light-intensity walking.
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