Do Short Spurts of Physical Activity Benefit Cardiovascular Health? The CARDIA Study

作者：White Daniel K^*; Gabriel Kelley Pettee; Kim Yongin; Lewis Cora E; Sternfeld Barbara

来源：Medicine and Science in Sports and Exercise, 2015, 47(11): 2353-2358.

DOI：10.1249/MSS.0000000000000662

• PHYSICAL ACTIVITY
• COHORT STUDY
• OBESITY
• HYPERTENSION

Background: For optimal health benefits, moderate- to vigorous- intensity physical activity ( MVPA) is recommended in sustained bouts lasting >= 10 min. However, short spurts of MVPA lasting <10 min are more common in everyday life. It is unclear whether short spurts of MVPA further protect against the development of hypertension and obesity in middle-age adults beyond bouted MVPA. Methods: Objectively measured physical activity was collected in the Coronary Artery Risk Development in Young Adults study at the 20- yr ( 2005- 2006) examination, and blood pressure and BMI were collected at the 20- and 25- yr ( 2010- 2011) examinations. Time spent in MVPA was classified as either bouted MVPA, i. e., >= 10 continuous minutes or short spurts of MVPA, i. e., <10 continuous minutes. To examine the association of short spurts of MVPA with incident hypertension and obesity over 5 yr, we calculated risk ratios adjusted for bouted MVPA and potential confounders. Results: Among 1531 and 1251 participants without hypertension and obesity, respectively, at year 20 ( age, 45.2 +/- 3.6 yr; 57.3% women; body mass index, 29.0 +/- 7.0 kgm-2), 14.8% and 12.1% developed hypertension and obesity by year 25. Study participants in the highest tertile of short spurts of MVPA were 31% less likely to develop hypertension 5 yr later ( risk ratio = 0.69 ( 0.490.96)) compared with those in the lowest tertile. There was no statistically significant association of short spurts of MVPA with incident obesity. Conclusions: These findings support the notion that accumulating short spurts of MVPA protects against the development of hypertension but not obesity in middle-age adults.

• 出版日期2015-11