Hay Jacqueline, Maximova Katerina, Durksen Anita, Carson Valerie, Rinaldi Randi Lynn, Torrance Brian, Ball Geoff D C, Majumdar Sumit R, Plotnikoff Ronald C, Veugelers Paul, Boulé Normand G, Wozny Paul, McCargar Linda, Downs Shauna, Lewanczuk Richard, McGavock Jonathan
Manitoba Institute of Child Health,Department of Pediatrics and Child Health, University of Manitoba, Winnipeg, Canada.
Arch Pediatr Adolesc Med. 2012 Nov;166(11):1022-9. doi: 10.1001/archpediatrics.2012.1028.
To determine the association between physical activity (PA) intensities and cardiometabolic risk factors in youth.
Cross-sectional study using data from the 2008 Healthy Hearts Prospective Cohort Study of Physical Activity and Cardiometabolic Health in Youth.
Rural and urban communities in Alberta, Canada.
A convenience sample of 605 youth aged 9 to 17 years. Youth were on average aged 12.1 years, 248 were boys (41%), and 157 were overweight or obese (26%).
Actical accelerometer-measured PA intensity.
The primary outcome was body mass index (calculated as weight in kilograms divided by height in meters squared) z score. Secondary outcome measures included waist circumference, systolic blood pressure, and cardiorespiratory fitness (maximal oxygen consumption [[Vdot]O2max]).
Body mass index z score, waist circumference, and systolic blood pressure decreased and [Vdot]O2max increased in a dose-response manner across tertiles of vigorous PA (adjusted P < .001). No significant differences in cardiometabolic risk factors were seen across tertiles of moderate or light PA in multivariable analyses. Achieving more than 7 minutes of vigorous PA daily was associated with a reduced adjusted odds ratio of overweight status (0.56; 95% CI, 0.33-0.95) and elevated systolic blood pressure (0.36; 95% CI, 0.16-0.79). The odds of overweight status and elevated blood pressure decreased with increasing time and intensity of PA.
Only vigorous PA was consistently associated with lower levels of waist circumference, body mass index z score, systolic blood pressure, and increased cardiorespiratory fitness in youth. These findings underscore the importance of vigorous PA in guidelines for children and adolescents.
确定青少年身体活动（PA）强度与心血管代谢危险因素之间的关联。
横断面研究，使用来自2008年青少年身体活动与心血管代谢健康健康心脏前瞻性队列研究的数据。
加拿大艾伯塔省的农村和城市社区。
605名9至17岁青少年的便利样本。青少年平均年龄为12.1岁，248名是男孩（41%），157名超重或肥胖（26%）。
Actical加速度计测量的PA强度。
主要结局是体重指数（计算方法为体重千克数除以身高米数的平方）z评分。次要结局指标包括腰围、收缩压和心肺适能（最大耗氧量[[V̇O₂max]）。
在剧烈PA三分位数中，体重指数z评分、腰围和收缩压降低，[V̇O₂max]呈剂量反应关系增加（校正P<0.001）。多变量分析中，中等或轻度PA三分位数之间在心血管代谢危险因素方面未见显著差异。每天进行超过7分钟的剧烈PA与超重状态调整后的比值比降低（0.56；95%CI，0.33 - 0.95）和收缩压升高（0.36；95%CI，0.16 - 0.79）相关。超重状态和血压升高的几率随PA时间和强度增加而降低。
只有剧烈PA与青少年较低的腰围、体重指数z评分、收缩压水平以及增加的心肺适能持续相关。这些发现强调了剧烈PA在儿童和青少年指南中的重要性。
