南昌市学龄前儿童体力活动水平及影响因素分析

了解南昌市学龄前儿童体力活动水平及其影响因素,为改善学龄前儿童体力活动水平和干预措施提供参考依据.方法 采用随机分层的方式,选取南昌市12个县区的17所幼儿园,共招募3~6岁学龄前儿童4 740名,应用《幼儿身体活动教师问卷》和《幼儿身体活动家长问卷》进行调查.结果 学龄前儿童周末相对于工作日体力活动(PA)、中高强度体力活动(MVPA)下降,久坐行为(SB)增加,工作日和周末的PA、MVPA和SB的差异均有统计学意义(P值均<0.01).学龄前儿童工作日期间PA、MVPA达到推荐量的人数比例为44.9%~59.2%,45.4%~61.7%,周末PA、MVPA达到推荐量的人数比例为24.7%~27.8%,24.5%~29.9%,工作日达标比例高于周末.结论 南昌市学龄前儿童体力活动水平与推荐量存在很大差距.在工作日和周末表现出不同的活动模式,周末是最不活跃的时段.应建立“社会——校园——家庭”模式,改善学龄前儿童体力活动不足现状.     

Changes in physical activity in pre-schoolers and first-grade children: longitudinal study in the Czech Republic

Background The transition from kindergarten to first year at school is associated with a variety of psychosocial changes in children. The aim of this longitudinal study was to identify the changes in children's physical activity (PA) upon entry to first year at school; and to identify the days of the school week that exhibit low PA. Methods We monitored the PA levels of 176 children twice: initially in kindergarten and again in first‐year classes at school. The age (mean ± standard deviation) of children at kindergarten was 5.7 ± 0.5 years and 6.7 ± 0.5 years at the first year of elementary school. We evaluated PA employing the activity energy expenditure (AEE – kcal/kg/day) from Caltrac accelerometer and daily amount of steps (STEPS) from Yamax pedometer. Participants were monitored over 7 days to include a weekend. Results The mean AEE was 11.5 in pre‐school girls and 12.9 kcal/kg/day in boys; and STEPS were 9923 steps/day in girls and 11 864 in boys on weekdays. At weekends, it was 11.5 kcal/kg/day in girls and 12.7 kcal/kg/day in boys and 10 606 steps/day in girls and 11 182 steps/day in boys. The mean AEE and STEPS in first‐grade girls and boys was 9.9 and 9.8 kcal/kg/day respectively, and 7911 and 8252 steps/day respectively on weekdays, and 8.8 and 9.0 kcal/kg/day and 6872 and 7194 steps/day respectively at weekends. First‐grade school children had significantly lower PA than pre‐school children on weekdays (P < 0.0001) and at weekends (P < 0.0001). Decline in PA on weekdays was during time spent at school (P < 0.0001) and not during after‐school children's leisure time. Conclusion The parts of the week when first‐grade school children show low PA are the times spent in lessons and in after‐school nursery and at weekends. PA needs to be promoted using intervention programmes mainly during the after‐school nursery programmes and at weekends.     

Associations between Sleep and Dietary Patterns among Low-Income Children Attending Preschool

BackgroundSleep disturbances and low-quality diets are prevalent among children in low-income settings, yet the nature of their relationship remains unclear. In particular, whether aspects other than sleep duration, including timing and quality, are associated with dietary patterns has rarely been examined, especially among preschool-aged children.ObjectiveTo evaluate whether nightly and total sleep duration, sleep timing, differences in timing and duration from weekdays to weekends, and sleep quality were related to dietary patterns.DesignA cross-sectional analysis of children attending preschool. Parents completed questionnaires about children’s sleep habits as well as a semiquantitative food frequency questionnaire.Participants/settingThree hundred fifty-four English-speaking children (49.9% boys) with no serious medical conditions aged 3 to 5 years who were enrolled in Head Start in Michigan (2009-2011) with complete information on sleep and diet.Main outcome measuresDietary pattern scores derived from food frequency questionnaire.Statistical analyses performedPrincipal component analysis was used to identify dietary patterns. Separate linear regression models with dietary pattern scores as the dependent variable and continuous sleep measures as independent variables were used to evaluate associations between sleep and diet, adjusting for sex, age, parent education level, and sleep hygiene.ResultsThree dietary patterns were identified: Vegetables, Healthy Proteins, and Sides; Breads and Spreads; and Processed and Fried. Longer average weekend sleep duration and a greater difference in weekend-to-weekday sleep duration was related to lower Vegetables, Healthy Proteins, and Sides pattern scores. Later sleep midpoint during weekdays was related to lower Vegetables, Healthy Proteins, and Sides pattern scores, whereas later sleep midpoint on the weekend was associated with higher Processed and Fried pattern scores. Similarly, a larger weekend–weekday midpoint difference was associated with higher Processed and Fried pattern scores.ConclusionsLater sleep timing and differences in sleep duration and timing from weekends to weekdays were related to less-optimal dietary pattern scores in young children.     

Patterns of habitual activity across weekdays and weekend days in 9-11-year-old children

OBJECTIVE: To characterize the pattern of activity in boys and girls across weekdays and weekend days. METHODS: Physical activity was recorded every 2 s by uniaxial accelerometry in 84 children, aged 9-11 years, for up to four weekdays and two weekend days. Activity bouts (>or= 4 s and >or= 5 min) greater than light (>or= LIGHT), moderate (>or= MOD) and vigorous (>or= VIG) intensity were recorded. The study took place in the South-West of England in 2007. RESULTS: The mean duration of activity bouts decreased as intensity increased from 11.0+/-1.3 s for >or= LIGHT activity to 6.1+/-1.0 s for >or= VIG activity. The frequency, duration and intensity of bouts were greater in boys than girls, and the frequency and duration of bouts were greater on weekdays than weekend days. Girls accumulated more activity sporadically than boys, whereas boys accumulated more activity in >or= 5-min bouts. CONCLUSION: Sex differences and weekday/weekend differences in activity were largely due to the intensity of the most frequent bouts of activity and frequency of the most intense bouts. Information regarding the pattern of children's habitual activity can be used to inform activity interventions and assess the aspects of the activity pattern that are related to health.     

Pedometer determined physical activity levels in primary school children from central England

OBJECTIVE: To assess ambulatory physical activity in school children from central England, to examine any variation in activity between weekdays and weekends and to determine the percentage of children meeting recently identified cut-off steps/day for health. METHOD: 208 British primary school children (101 boys and 107 girls, mean age 9.3+/-0.9 years) from central England wore a sealed pedometer for 4 consecutive days (2 weekend and 2 weekdays) during 2006 from which daily step counts were determined. Data were collected over winter, spring and summer terms. Repeated measures analysis of variance was used to examine potential time (weekend versus weekday), gender and age differences in steps/day. RESULTS: Children attained significantly higher mean steps/day during weekdays than weekends (p<0.001), and boys attained significantly higher mean steps/day than girls (p<0.05). Mean steps/day values were 13,827 (38,201) and 10,334 (4436) for weekdays and weekends and 12,263 (3789) and 11,748 (3310) for boys and girls respectively. 28.7% of boys and 46.7% of girls met or exceeded the BMI referenced cut-offs for health. CONCLUSION: Physical activity was greater during weekdays compared to weekends and boys were more active than girls but the majority of children did not meet the health-related cut-off points.     

TELEVISION VIEWING HABITS AND TIME USE IN AUSTRALIAN PRESCHOOL CHILDREN

The overall aim in this study was to investigate time use in Australian preschool children, paying close attention to the types of television programs and videos/DVDs they watch. Ninety‐two mothers of preschool children completed five activity diaries, for three typical weekdays and two weekend days. On average, children spent around just over 1 hour per weekday watching television and 30 minutes watching videos/DVDs; on weekends they spent on average 1 hour watching television and the same amount of time watching videos/DVDs. On weekdays, children spent more time watching child informative television; on the weekend they spent more time watching child animated television programs. When not watching television, children were mainly engaged in general play or in outdoor play. Child informative television was associated positively with time spent outdoors and in general and pretend play on weekdays (and for general play also on weekend days), whereas overall television viewing was correlated negatively with reading. Our findings suggest that the content of television programs may play a critical role in the relationship between television and other daily activities.     

新冠肺炎疫情期间广东省小学生视屏行为现状及影响因素

  目的  了解新型冠状肺炎疫情期间广东省小学生网课及视屏行为现状及其影响因素,为儿童视屏行为干预和健康促进提供依据。  方法  采用方便抽样的方法抽取广东省广州市、湛江市、中山市共5 266名6~12岁小学生家长进行线上问卷调查。采用方差分析或χ2检验比较各年级学生网课和视屏行为现状的差异,采用多因素Logistic回归分析娱乐型视屏时间过长的影响因素。  结果  小学生学习日和周末娱乐型视屏时间过长检出率分别为42.2%和55.2%;与非疫情的学期相比,娱乐型视屏时间在学习日和周末分别增长了40.31和33.07 min/d。各年级小学生平均单节网课时长为(26.07±9.62)min,单日网课时长为(110.41±51.98)min。性别、年级、是否独生子女、父母文化程度等人口学因素是娱乐型视屏时间过长的影响因素; 与父母陪伴运动锻炼频率较高的儿童相比,父母陪伴运动锻炼频率中等(学习日: OR=1.27,周末: OR=1.40)和较低(学习日: OR=1.86,周末: OR=1.84)儿童娱乐型视屏时间过长的风险较高(P值均 < 0.05);相较于父母限制视屏行为频率较高的儿童,父母限制视屏行为频率中等和较低儿童学习日娱乐型视屏时间过长的风险较高(OR值分别为1.61,1.32,P值均 < 0.05);父母娱乐型视屏时间≥2 h/d较 < 2 h/d易使儿童娱乐型视屏时间过长的风险增加(学习日: OR=3.09,周末: OR=2.81,P值均 < 0.05);儿童中高强度体力活动 < 1 h/d(学习日: OR=1.31)相较于≥1 h/d,用电子设备学习时间1~2 h/d(学习日: OR=2.65,周末: OR=2.65)、≥2 h/d(学习日: OR=4.05,周末: OR=5.24)相较于 < 1 h/d也增加了娱乐型视屏时间过长的风险(P值均 < 0.05)。  结论  疫情期间,广东省儿童视屏时间水平较高,需加强恢复学校教学秩序后儿童的行为监测以及实施有针对性的干预措施。     

Accelerating control of pertussis in England and Wales

Results of an accelerated pertussis vaccination schedule for infants introduced in 1990 in England and Wales were examined. Earlier scheduling and sustained high vaccine coverage resulted in fewer reported cases of pertussis among infants, reinforcing the World Health Organization drive for on-time completion of the infant vaccination schedule. As determined by using the screening method, the first dose of vaccine was 61.7% effective in infants <6 months of age, and effectiveness increased with subsequent doses. Three doses of a good whole-cell pertussis vaccine were 83.7% effective in children 10-16 years of age; a preschool booster vaccination further reduced pertussis incidence in children <10 years of age. As in other industrialized countries, surveillance data during 1998-2009 showed that pertussis in England and Wales mainly persists in young infants (i.e., <3 months of age), teenagers, and adults. Future vaccine program changes may be beneficial, but additional detail is required to inform such decisions.     

河南城市学龄前儿童睡眠状况及影响因素分析

目的 了解河南城市学龄前儿童睡眠状况及其影响因素,为该地区学龄前儿童保持合理睡眠时间和睡眠干预提供参考。方法 2019年5—6月采用分层整群抽样的方法在河南对4 226名3～6岁学龄前儿童家长进行儿童睡眠状况及影响因素的调查,并采用χ²检验、logistic回归分析等方法进行分析。结果 河南城市学龄前儿童平均睡眠时长为（9.46±1.98）h,睡眠不足的比例为56.60%。在体力活动时间、视屏时间、抚养者、父亲学历、母亲学历等方面睡眠不足的比例相比较均有统计学意义（χ² = 46.853、48.424、27.763、19.654、20.063,P＜0.001）。Logistic回归分析表明,河南城市＞4～4.5岁（OR = 1.313,95%CI:1.064～1.567）、＞4.5～5岁（OR = 1.982,95%CI:1.627～2.355）、＞5～5.5岁（OR = 2.052,95%CI:1.674～2.435）、＞5.5～6岁（OR = 2.374,95%CI:1.812～2.944）学龄前儿童、体力活动时间＜60 min/d（OR = 1.745,95%CI:1.483～2.011）、体力活动时间60～120 min/d（OR = 1.481,95%CI:1.251～1.722）、外祖父母等抚养（OR = 1.222,95%CI:1.061～1.381）、母亲学历初中及以下（OR = 1.364,95%CI:1.147～1.595）、母亲学历高中（OR = 1.171,95%CI:1.024～1.321）者其学龄前儿童的睡眠不足发生率较高,呈正相关关系。结论 河南学龄前儿童睡眠不足问题凸显,年龄、体力活动、视屏时间、抚养者、母亲学历等是导致睡眠不足的影响因素,应针对影响因素给予干预和改善。     

儿童期视屏时间与左心室肥厚的关系

目的 分析儿童期视屏时间与左心室肥厚(LVH)的关系,为预防LVH等靶器官损害提供基础数据。方法 2017年11月-2018年1月采用方便整群抽样的方法,选取淄博市桓台县城南学校1 319名6~11岁儿童作为研究对象,进行问卷调查、身体测量和超声检测。LVH定义为左心室质量指数(LVMI)超过本人群的性别和年龄别的第90百分位数(P₉₀)。采用多元Logistic 回归模型分析视屏时间对儿童LVH的影响。结果 所有儿童学习日、休息日和平均每月视屏时间分别为(0.42±0.65)h、(1.83±1.32)h 和(0.83±0.71)h,超过2 h/d的学生比例分别为0.6%(8/1 319)、23.4%(308/1 319)和4.6%(61/1 319)。多元Logistic 回归模型分析发现,控制性别、年龄、蔬菜水果、碳酸饮料、体力活动、睡眠时间和血压等协变量后,与平均每日视屏时间≤2 h/d相比,平均每日视屏时间>2 h/d的学生罹患LVH的风险增加(OR=2.16,95%CI=1.08~4.32,P＝0.03)。进一步控制体重指数(BMI)后,平均每日视屏时间>2 h/d的学生LVH的罹患风险的统计学意义消失(OR=1.45,95%CI=0.63~3.33,P=0.388)。而学习日和休息日视屏时间>2 h/d的学生罹患LVH风险,与视屏时间≤2 h/d的学生相比,差异无统计学意义(P>0.05)。结论 每天视屏时间过长是儿童LVH的重要危险因素,而BMI可能在视屏时间与LVH关系中起着中介效应。     

Monitoring physical activity in Baltic countries: the FINBALT study, HBSC and other surveys in young people

Aim: The promotion of health through increased physical activity (PA) has become a national public health objective for both adults and children. To achieve this aim a good and comparable monitoring system of PA and its determinants is needed. The aim of the current review paper is to describe how PA is monitored and what the trends are in PA among adults and children in Baltic countries and Finland as well as the association between PA, body mass index (BMI) and socio-economic determinants. Subjects and methods: Data from two relevant surveys at the moment were used to make comparisons in PA trends between Baltic countries and Finland: FINBALT Health Monitor for adults aged 16–64 years and Health Behaviour in School-aged Children (HBSC) for 11-, 13- and 15-year-old schoolchildren. Results and conclusions: The percentage of adults involved in PA twice a week in Baltic countries is remarkably lower than in Finland. Among schoolchildren no clear country difference is obvious in the participation in leisure time PA between Baltic countries and Finland. After graduating school, involvement in organised PA decreases in young people remarkably. Both overweight and obese adults and children tend to be less physically active than normal weight persons. Adults and young people from more affluent families are more physically active than those in less affluent families. In order to better explain the changes in PA trends and the effectiveness of preventive work, more and better indicators that determine the involvement in PA and the effectiveness of interventions have to be added to the survey questionnaires.     

北京市流动和本地初一学生视屏行为现状及影响因素分析

比较分析北京市流动与本地儿童在学习日与周末的视屏行为现状及其影响因素,为后续健康教育和其他干预提供提供参考.方法 采用方便抽样的方法,抽取北京市海淀区4所普通公立中学所有2014—2015学年初一学生621名进行问卷调查.结果 儿童学习日和周末平均每天的视屏时间分别为(1.04±1.50)和(2.56±2.45)h,儿童周末视屏时间超过推荐标准,且远高于学习日.流动儿童学习日和周末视屏时间符合率(≤2 h)分别为83.70%,48.60%,本地儿童分别为90.10%,43.90%.自我控制差的流动儿童学习日超过推荐视屏时间标准的风险是自我控制好的儿童的2.21倍(95%CI=1.124.36).家庭支持低的本地儿童学习日和周末超过推荐视屏时间标准的风险是家庭支持高的儿童的3.42(95%CI=1.328.89)和2.74倍(95%CI=1.495.03).结论 北京市儿童尤其是流动儿童的视屏行为现状不容乐观.应针对影响流动和本地儿童行为的不同因素,开展有针对性的教育和干预工作.     

Patterns of physical activity in free-living adults in the Southern United States

OBJECTIVE: To examine the relationship between the amount and patterns of physical activity (PA), body fatness, and age in a heterogeneous adult population in the free living. DESIGN: Cross-sectional study of the amount of PA over a 1-week period. The amount of body movements during PA (PA counts*10(3)) and time spent on various PA intensity categories were calculated from a triaxial accelerometer and compared with subject characteristics, including body fat from hydrodensitometry. PARTICIPANTS: Adult healthy men (n=48) and women (n=72) were recruited from the Nashville, Tennessee area and their PA was monitored in their free-living environment. RESULTS: The average weekday PA counts (176.5+/-60.3, P=0.002, r(2)=0.294), PA counts day-to-day variability (47.3+/-32.7, P=0.002, r(2)=0.286), daily maximum PA counts (241.9+/-89.2, P=0.001, r(2)=0.327), minute-to-minute variability on weekdays (0.281+/-0.091, P=0.001, r(2)=0.362), and the difference between maximum and minimum daily PA counts (130.6+/-78.3, P=0.008, r(2)=0.243) were significantly and negatively correlated with body fatness. During awake time, both men and women spent 10-12 h on low intensity (1.0-2.9 metabolic equivalents (METs)) PA, approximately 1 h on moderate (3.0-5.9 MET), and less than 10 min on vigorous (>6.0 MET) PA each day. On weekends, men and women spent more time at rest (1 MET), less time on low-intensity PA, and men spent more time on moderate PA than on weekdays. CONCLUSIONS: In adults living in the Southern US the amount of free-living PA was negatively correlated with body fatness. Both men and women spent the majority of active time on low and moderate PA. PA patterns on weekends were different than on weekdays and were related to sex and age, but not to body fatness. SPONSORSHIP: National Institutes of Health, US.     

学龄前儿童体力活动、久坐行为与睡眠问题的相关性

目的 探究学龄前儿童体力活动(Physical activity,PA)、久坐行为(Sedentary behavior, SB)与睡眠问题的相关性,为预防、改善该群体睡眠问题提供参考。方法 2020年9—12月,采用整群随机抽样法,抽取北京市6所幼儿园406名学龄前儿童作为研究对象,采用Acti Graph GT3X+三轴加速度计客观测量PA,采用《儿童休闲活动调查问卷》调查SB,采用CSHQ睡眠习惯量表测评睡眠问题,运用线性分析、logistic 回归模型处理数据。结果 学龄前儿童睡眠问题检出率71.08%;PA与睡眠抗阻、睡眠时长不规律、睡眠夜醒、异态睡眠、CSHQ综合评分具有显著负向线性相关(β=-0.141、-0.452、-0.324、-0.201、-0.150 ,P<0.05);SB与睡眠抗阻、入睡潜伏期延长、睡眠夜醒、CSHQ综合测评具有显著正向线性相关(β=0.196、0.223、0.210、0.910,P<0.05)。对PA、SB联合分析,在PA(或SB)等级固定时,CSHQ测评合格率会因另一方等级的提高而降低（或升高）,在高PA+低SB(OR=2.119,95%CI:1.464~3.368,P<0.05)和低PA+高SB（1reference）两个极端组合时,CSHQ测评合格率获得优势分别为最高和最低;高PA+高SB(OR=1.750,95%CI:1.320~2.664)比低SB+低PA (OR=1.640,95%CI:1.412~2.743)CSHQ测评合格率获得优势更高。结论 体力活动与学龄前儿童睡眠问题具有显著的负相关,久坐行为与学龄前儿童睡眠问题具有显著正相关,二者联合则具有抵消或协同的交互效应。     

Risk behaviors,medical care,and chlamydial infection among young men in the United States

OBJECTIVES: This study assessed factors related to chlamydial infection among young men in the United States. METHODS: Data were from interviews of nationally representative samples of 470 men aged 18 to 19 years (teenagers) and 995 men aged 22 to 26 years (young adults) and from urine specimens tested by means of polymerase chain reaction. RESULTS: Although a majority of the men reported occasional unprotected intercourse, only a minority perceived themselves to be at risk for contracting a sexually transmitted disease (STD). Chlamydial infection was detected in 3.1% of the teenagers and 4.5% of the young adults. A minority of those infected had symptoms or had been tested for STDs; very few had been diagnosed with STDs. CONCLUSIONS: Chlamydial infection is common but usually asymptomatic and undiagnosed. Primary and secondary prevention efforts should be increased, particularly among young adult men.     

Patterns of physical activity in Spanish children: a descriptive pilot study

Background The majority of Spanish adults and children do not engage in enough physical activity to be beneficial for health. There is a need for objective and accurate assessment of the proportion of children meeting the physical activity recommendation for health. Assessing patterns of physical activity both between days (during weekdays and weekend days) and within days is of interest to improve our understanding of the variation in Spanish children's physical activity and to provide efficient intervention programmes. Methods A sample of 221 children: 136 9‐year‐old children (68 boys and 68 girls) and 85 15‐year‐old children (36 girls and 49 boys) from 12 urban public schools in Madrid, Spain entered the study. The variables measured were anthropometric characteristics (height, weight, body mass index) and physical activity measured during four consecutive days using the GT1M accelerometer. Results Younger children were more active and less sedentary than older ones during week and weekend days. Nine‐year‐old boys and girls achieved significantly (P < 0.05) more moderate to vigorous physical activity (MVPA) and significantly (P < 0.01) less sedentary time than older 15‐year‐old children. During weekdays more children achieved physical activity recommendations versus weekend days. Physical activity patterns analyses indicated that boys achieved relatively high values of MVPA from 1100 till 1300 h (school break) and from 1800 till 2000 h in comparison with the rest of the day. Girls were substantially different, with the 9‐year‐old girls having only two obvious peaks of weekday MVPA at lunch (1300) and after school (1900 h) while the adolescent girls had no clear peak of MVPA. Conclusions Few children achieved the level of MVPA recommended for health; at particular risk were adolescent girls. More effort needs to be devoted to promoting appropriate opportunities for Spanish girls across the day and to promoting physical activity during weekends for all children.     

Adherence to Active Play and Electronic Media Guidelines in Preschool Children: Gender and Parental Education Considerations

The primary purpose of the present study was to examine adherence to current active play and electronic media use guidelines in a sample of US preschool-aged children and to examine whether differences occurred across gender and parental education. 164 parents completed an on-line survey to estimate preschool children’s active play and sedentary behaviors. For weekdays, 50% of the sample met the active play guideline with this increasing to 65% during the weekend. With respect to electronic media use, 90% of the sample met guidelines during the week, with the percentage meeting guidelines dropping to 78% during the weekend. A greater percentage of preschool children from high parental education families (83.4 ± 3.3) met electronic media use guidelines on the weekends, compared to preschool children from low parental education families (59.4 ± 8.1) (p = 0.002). Our findings indicate that a substantial portion of preschool children are not meeting active play guidelines and that adherence to active play and electronic media use guidelines may be influenced by parental education.     

郑州市3～5岁学龄前儿童行为问题研究

目的:探讨郑州市3～5岁儿童的行为问题及父母关注度研究。方法:采用Conners父母症状问卷,对251名3～5岁学龄前儿童进行调查研究。结果:独生子女焦虑因子分高于非独生子女(P0.05);和1978年常模比较,3～5岁组男童的学习问题和心身障碍明显高于常模。3岁组女童冲动-多动因子分高于男童,4岁组男童品行行为因子分高于女童,5岁组女童心身障碍因子分高于男童,3个年龄段Conners各个因子分差异无统计学意义。结论:①独生子女比非独生子女焦虑程度高;②学龄前儿童不同年龄段行为问题需要具体分析;③父母比较关注学龄前儿童心理健康全面发展。     

Assessing the Validity of a Physical Activity Questionnaire Developed for Parents of Preschool Children in Mexico

To assess the validity of a questionnaire developed for parents of preschool children to know their physical activity (PA) status, we compared the questionnaire results with the measures of accelerometer for children''s activities. Thirty-five preschoolers who wore the accelerometer for at least 10 hours daily on 3 weekdays and one weekend day were included in the analyses. Time spent in activities of varied intensity was calculated by applying 15-second ActiGraph count cutoffs (ACC). Parents’ perceptions of their children''s PA were associated with the percentage of vigorous and moderate physical activity recorded with ACC at r=0.62 (p=0.0001). An association was shown between the percentage of a child''s time spent in vigorous physical activity, as reported by parents, with that measured by ACC at r=0.53 (p=0.001). Results of this study suggest that the designed questionnaire might be a useful tool for assessing children''s activity while, additionally, it warrants further investigation on larger samples of children.Key words: Accelerometer, Physical activity, Preschool children, Validity assessment, Mexico