Objectively Measured Physical Activity and Metabolic Syndrome in Older Japanese Adults: Longitudinal Data from the Nakanojo Study
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.33 Vol.33】
Background. There are significant cross-sectional associations between metabolic profiles and yearlong physical activity in older adults, with better health in those taking at least 8,000-10,000 steps/day and/or spending at least 20-30 min/day at >3 metabolic equivalents (METs). The present study examines these relationships longitudinally.
Methods. Subjects were free-living Japanese aged 65-84 years (198 men, 242 women). Pedometer/accelerometers measured daily step count and physical activity intensity continuously for 10 years, with evaluation of metabolic syndrome criteria at baseline and each year end. At year-end, participants were screened for metabolic syndrome (modified criteria of NCEP-ATP III).
Repeated measures analysis of variance assessed changes in month-averaged physical activity scores for each July. Cox proportional hazards regression analysis assessed independent relationships between baseline physical activity and the 10-year risk of suffering from metabolic syndrome, after controlling for baseline number of metabolic syndrome diagnostic markers, age, sex, smoking status and alcohol consumption.
Results. Subjects maintained their physical activity over the 10 years. Most individuals aged 65-74 years who took >10,000 steps/day and/or spent >30 min/day of activity >3 METs consistently showed ≤2 metabolic syndrome diagnostic markers, as did those aged 75-84 years with >8,000 steps/day and/or >20 min/day at >3 METs. A multivariate-adjusted Cox proportional hazards model predicted that the risk of suffering from metabolic syndrome during the 10 years was 2.3-4.2 and 1.9-3.0 times greater in the two least active quartiles of participants (taking <6,400 steps/day and spending <12 min/day at >3 METs, respectively) relative to the most active quartiles (taking >8,500 steps/day and spending >20 min/day at >3 METs, respectively).
Conclusions. This prospective study supports our cross-sectional observations. After adjustment for potential confounders, the metabolic health of older people is associated with both the quantity (daily step count) and the quality (daily duration at an intensity >3 METs) of habitual physical activity. To conserve metabolic health, elderly people should be encouraged to take at least 8,000-10,000 steps/day and/or spend at least 20-30 min/day at >3 METs.
DESCENTE SPORTS SCIENCE Vol.33/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
Methods. Subjects were free-living Japanese aged 65-84 years (198 men, 242 women). Pedometer/accelerometers measured daily step count and physical activity intensity continuously for 10 years, with evaluation of metabolic syndrome criteria at baseline and each year end. At year-end, participants were screened for metabolic syndrome (modified criteria of NCEP-ATP III).
Repeated measures analysis of variance assessed changes in month-averaged physical activity scores for each July. Cox proportional hazards regression analysis assessed independent relationships between baseline physical activity and the 10-year risk of suffering from metabolic syndrome, after controlling for baseline number of metabolic syndrome diagnostic markers, age, sex, smoking status and alcohol consumption.
Results. Subjects maintained their physical activity over the 10 years. Most individuals aged 65-74 years who took >10,000 steps/day and/or spent >30 min/day of activity >3 METs consistently showed ≤2 metabolic syndrome diagnostic markers, as did those aged 75-84 years with >8,000 steps/day and/or >20 min/day at >3 METs. A multivariate-adjusted Cox proportional hazards model predicted that the risk of suffering from metabolic syndrome during the 10 years was 2.3-4.2 and 1.9-3.0 times greater in the two least active quartiles of participants (taking <6,400 steps/day and spending <12 min/day at >3 METs, respectively) relative to the most active quartiles (taking >8,500 steps/day and spending >20 min/day at >3 METs, respectively).
Conclusions. This prospective study supports our cross-sectional observations. After adjustment for potential confounders, the metabolic health of older people is associated with both the quantity (daily step count) and the quality (daily duration at an intensity >3 METs) of habitual physical activity. To conserve metabolic health, elderly people should be encouraged to take at least 8,000-10,000 steps/day and/or spend at least 20-30 min/day at >3 METs.
DESCENTE SPORTS SCIENCE Vol.33/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Sungjin Park, Yukitoshi Aoyagi |
|---|---|
| University or institution | Exercise Sciences Research Group, Tokyo Metropolitan Institute of Gerontology |
Keywords
physical activity, metabolic syndrome, Cox proportional hazards regression analysis