Physical activity patterns in children with and without Down syndrome

PURPOSE: To describe physical activity (PA) patterns in children with Down syndrome (DS) compared to their unaffected siblings. METHODS: Children with DS (n = 28) and their siblings (n = 30), between 3-10-years (mean +/- SD 7.1 +/- 2.1 years) participated in a nutrition and growth study. PA was measured over 7 days using accelerometers. RESULTS: Children with DS were younger (6.6 vs. 7.1 years) and heavier (BMI 18.4 vs. 16.7 kg m(-2)) than their siblings (p < 0.05). Overall, participants accumulated 2.5 hours per day in moderate- (MPA) and 59 min per day in vigorous-intensity activity (VPA), consistent with the current PA recommendations for children. Children with DS accumulated less VPA than their siblings (49.5 vs. 68.6 minutes per day; p = 0.04) and for shorter bouts (2.5 vs. 5.1 minutes per bout; p < 0.01), but spent similar time in MPA and low-intensity PA. Analyses adjusted for age, sex, race, ethnicity, income, maternal education and BMI showed similar results. CONCLUSIONS: Children with DS participated in less total and sustained VPA and had higher BMI levels compared with their siblings. Because children with DS have a tendency toward childhood obesity, increasing participation in VPA may be appropriate for prevention of obesity and promotion of lifelong health.     

Accelerometry-assessed sedentary behaviour and physical activity levels during the segmented school day in 10–14-year-old children: the HAPPY study

The school day offers several different time periods that provide varying opportunities for sedentary time (SED) and engagement in physical activity (PA), yet little is known about the PA and sedentary behaviour patterns of boys and girls during these times. The volume, intensity and temporal distributions of SED and PA undertaken by 135 schoolchildren aged 10?C14?years, during different segments of the school day: (a) school transport, (b) morning recess, (c) lunch break, (d) class time and (e) after school, were explored using triaxial accelerometry. PA was categorised into SED, light PA (LPA), moderate PA (MPA) and vigorous PA (VPA). Girls engaged in significantly more SED and LPA than boys during recess and lunch break (p?<?0.05), while boys engaged in significantly higher levels of VPA during recess (p?<?0.001) and MPA and VPA during lunch break (p?<?0.001). PA engagement was similar between sexes during other segments of the day. Conclusion: PA patterns appear more beneficial for health in boys during less structured school-based time periods and interventions may therefore target opportunities for girls to be physically active during these times to overcome this observed sex deficit.     

Children younger than 7 years with type 1 diabetes are less physically active than healthy controls

Aim: To examine if children younger than 7 years with type 1 diabetes are less physically active and spend more time sedentary than healthy children. Methods: Using a repeated measures case‐control study design, physical activity (PA) was measured by continuous combined accelerometer and heart rate registration for 7 days at two time points during 1 year (autumn and spring). PA data were expressed as time spent sedentary, in moderate and vigorous intensity PA and total PA. Differences between groups and gender were analysed with mixed linear regression models. In this study there were 24 children (12 girls) with type 1 diabetes mellitus and 26 (14 girls) healthy controls, all younger than 7 years at inclusion. Results: Children with diabetes were less active overall (p = 0.010) and spent 16 min less in moderate‐to‐vigorous PA (p = 0.006). The difference in sedentary time (21 min less) between groups was not significant (p = 0.21). Overall PA (12.1 counts/min per day, p = 0.004) and time in moderate and vigorous PA (16.0 min/day, p = 0.002) was significantly higher in boys than in girls. A significant effect of age was observed. Conclusion: Physical activity is significantly reduced in young children with type 1 diabetes.     

Longitudinal changes in 11-13-year-olds' physical activity

The influence of age, sex, maturity, body mass and body fatness on the physical activity (PA) of 11-13-y-olds was examined longitudinally. Body mass, triceps and subscapular skinfold thickness and pubic hair were recorded and 3-d continuous heart rate (HR) monitoring was used to estimate PA on each annual measurement occasion. At the onset, subjects were 11.0 (0.4)-y-old and data were available on 202, 143 and 160 subjects in years 1 to 3, respectively with an almost equal sex distribution. Multilevel regression modelling examined age-, sex- and maturity-related changes in time spent with HR above 139 (moderate activity) and 159 (vigorous activity) bpm. Sustained (10 or 20 min) periods of moderate or vigorous activity were not characteristic of PA patterns. Both PA measures declined with age, with a consistent sex difference reflecting the lower PA levels of girls. Body mass and fatness were not significant explanatory variables, but an additional decrement in activity was evident in late maturity. Conclusion: Few children experience extended bouts of PA, and from 11-13 y, PA decreases, with more girls than boys becoming inactive. The data emphasize the importance of promoting active lifestyles during youth.     

Influence of gender, BMI and Hispanic ethnicity on physical activity in children.

OBJECTIVE: The purpose of this study was to examine the association between overweight status and physical activity (PA) among gender and ethnic (Hispanic vs. non-Hispanic) sub-groups in elementary school-age children. METHODS: PA was assessed over five days using the Actigraph accelerometer in 169 fourth grade students (mean age 9.4 years; 50% female; 63% Hispanic; and 43% overweight, defined as body mass index, BMI > or = 85th percentile for age and gender) from four elementary schools in Los Angeles County, California. RESULTS: In the total sample, boys and normal weight students had higher levels of total PA (counts per minute, cpm; p<0.05). Boys spent less time in sedentary PA (p=0.02) and more time in combined moderate to vigorous PA (MVPA, p=0.01). There was a significant gender, ethnicity, and overweight interaction for total PA and MVPA (both p<0.01). MVPA and counts per minute were significantly lower in overweight non-Hispanic girls and Hispanic boys (p<0.05) and marginally lower in overweight non-Hispanic boys (p=0.10) when compared with non-overweight students, while overweight Hispanic girls were more physically active than Hispanic non-overweight girls, though the difference was non-significant (p>0.05). CONCLUSIONS: Data from the present study does not consistently support the prevailing hypothesis that overweight subjects engage in less PA. Results show overweight students engage in less PA than non-overweight students, with the exception that non-overweight Hispanic girls do not engage in more PA than their overweight peers. These results suggest the need for further investigation into the role that ethnicity and overweight status plays in PA levels, particularly among ethnic and gender sub-groups.     

Physical activity and movement skills proficiency of young Filipino children

Recent reports indicate an increasing prevalence of overweight among Filipino children. Considering the known association of physical activity (PA) with obesity, this study reports the findings of an objective monitoring of PA in a sample of Filipino children. The study also explores the relationship of PA with fundamental movement skills (FMS) proficiency. Thirty‐two children (6.54 ± 2.45 years old) wore an accelerometer for 7 days of PA monitoring and were assessed on five FMS (throw, catch, kick, run, jump). The children met the World Health Organization's recommendation of 60 min of PA per day, with more active time being accrued during weekdays than weekends. Children with greater FMS proficiency were found to spend more time in PA than those who were less skillful during weekends. Further research is recommended to examine PA and FMS proficiency associations, exploring the role of social interactions on weekends and weekdays.     

Daily physical activity in young children and their parents: A descriptive study

BACKGROUND:

Little is known about physical activity (PA) in young children and about the relationship between their PA and that of their parents.

OBJECTIVE:

The main purpose of the present study (Y-Be-Active) was to examine the daily PA levels of young children and their parents, and to explore the relationship between children’s and parents’ PA.

METHOD:

Fifty-four children (mean age 4.3 years) and their parents (54 mothers, mean age 35.8 years; 50 fathers, mean age 38.2 years) wore accelerometers for three weekdays and two weekend days. Parents also completed questionnaires on family sociodemographics and PA habits.

RESULTS:

Children spent most of their time in light PA. Almost all children attained 30 min of daily moderate-to-vigorous PA (MVPA), and most boys and girls attained 60 min of daily MVPA on weekdays. Only 60% of fathers and approximately one-half of mothers attained 30 min of daily MVPA on weekdays and weekend days. Children’s and fathers’ PA were correlated on weekends. Few parents (20% to 30%) participated regularly in organised PA with their child. Fathers’ involvement in PA with their children was associated with higher MVPA in children.

CONCLUSIONS:

Many young children and parents did not meet current Canadian recommendations for daily PA. Parental involvement in PA with their young children, particularly the involvement of fathers, appeared to promote higher levels of MVPA in young children.     

Objective measurement of levels and patterns of physical activity.

OBJECTIVE: To measure the levels and patterns of physical activity, using accelerometers, of 11-year-old children participating in the Avon Longitudinal Study of Parents and Children (ALSPAC). DESIGN: Cross-sectional analysis. SETTING: ALSPAC is a birth cohort study located in the former county of Avon, in the southwest of England. This study used data collected when the children were 11 years old. PARTICIPANTS: 5595 children (2662 boys, 2933 girls). The children are the offspring of women recruited to a birth cohort study during 1991-2. The median age (95% CI) of the children is now 11.8 (11.6 to 11.9) years. METHODS: Physical activity was measured over a maximum of 7 consecutive days using the MTI Actigraph accelerometer. MAIN OUTCOME MEASURES: Level and pattern of physical activity. RESULTS: The median physical activity level was 580 counts/min. Boys were more active than girls (median (IQR) 644 (528-772) counts/min vs 529 (444-638) counts/min, respectively). Only 2.5% (95% CI 2.1% to 2.9%) of children (boys 5.1% (95% CI 4.3% to 6.0%), girls 0.4% (95% CI 0.2% to 0.7%) met current internationally recognised recommendations for physical activity. Children were most active in summer and least active in winter (difference = 108 counts/min). Both the mother and partner's education level were inversely associated with activity level (p for trend <0.001 (both mother and partner)). The association was lost for mother's education (p for trend = 0.07) and attenuated for partner's education (p for trend = 0.02), after adjustment for age, sex, season, maternal age and social class. CONCLUSIONS: A large majority of children are insufficiently active, according to current recommended levels for health.     

Clustering of metabolic syndrome risk factors associated with lifestyle factors and serum leptin in Korean children

The present study investigated the relationships among metabolic risk factors, major lifestyle factors, and serum cytokines in a sample of Korean children. In a cross-sectional design, we studied a total of 275 children (130 boys and 145 girls) aged 12-13 years. Measured variables included anthropometrics, blood pressures (BP), VO2max, physical activity (PA), dietary intakes, lipids, glucose, and insulin. We explored the extent to which dietary intakes, VO2max, PA, and serum cytokines explained variance in a clustered risk score, which is a sum of Z scores for waist circumference, BP, TG, HDLC, and HOMA-IR, using a stepwise linear regression by blocks. VO2max, vigorous PA (VPA), and leptin were independent predictors for the clustered risk score while adjusting for age and Tanner stage. Our findings suggest that the clustered risk score is associated not only with low levels of VO2max and VPA, but also with elevated serum leptin in Korean children.     

Physical activity levels and estimated energy expenditure in overweight and normal‐weight 11‐year‐old children

Aim: To objectively evaluate physical activity and energy expenditure in overweight and normal‐weight 11‐year‐old children. Methods: The final sample consisted of 91 children (32 overweight and 59 normal‐weight children), mean age (SD) = 11.3 (0.2) years. Energy expenditure and physical activity were assessed during two weekdays and two weekend days using a multiple‐sensor body monitor (SenseWear Armband; BodyMedia Inc., Pittsburgh, PA, USA). Results: Time spent in physical activity was higher in normal‐weight compared with overweight children (p = 0.002). The highest level of physical activity was noted in normal‐weight boys [mean (SD) = 258 (114) min/day] and the lowest in overweight girls [mean (SD) = 136 (59) min/day] (p = 0.002). In contrast, energy expended during physical activity did not differ between normal‐weight and overweight children (2.6 and 2.7 MJ/day, respectively, p = 0.89). The average decrease in physical activity at weekends was 39 min in overweight children (from 166 to 127 min/day) and 27 min in their normal‐weight counterparts (from 230 to 203 min/day). Conclusion: Overweight children engaged in less physical activity of both moderate and vigorous intensity compared with their normal‐weight peers. Both overweight and normal‐weight children were less active at weekends than on weekdays. Initiatives aiming to increase physical activity of overweight children at weekends are warranted.     

Lymphocyte response after surgery in the neonate.

Fourteen neonates born with congenital malformations were investigated for lymphocyte function before and after surgery. Total leucocyte and absolute lymphocyte counts were unaltered after surgery. The mean percentage of T-lymphocytes observed either pre- or postoperatively was considerably lower than that reported in older children and adults. While there was an increase in the percentage of B-lymphocytes after operation in the infants, the absolute number of B-cells remained unchanges. The preoperative transformation response of lymphocytes to PHA (mean 12.9 +/- 5.4 X 10(3) counts/min) was little different from the postoperative values (mean 12.4 +/- 4.4 X 10(3) counts/min). These results suggest that the neonate is immunologically different from older children and adults in its response to anaesthesia and surgery.     

Minimum mycophenolic acid levels are associated with donor‐specific antibody formation

Although de novo DSA are associated with inferior graft survival, there are no effective strategies to prevent their formation. Underexposure to MPA (prodrug: MMF) also contributes to rejection rates early after transplantation, but the effect of this phenomenon on the formation of DSA long‐term post‐transplantation is unknown. Data are expressed as mean (standard deviation). All available data from 32 renal transplant recipients (age at transplantation 7.5 [4.5] yr) on tacrolimus and MPA immunosuppression with an average follow‐up of 9.4 (s.d. 4.6) yr were analyzed. DSA were measured using the Luminex assay (>500 MFI was considered DSA‐positive). Tacrolimus and MPA levels were measured with the Abbot Tacro II and EMIT assay, respectively. Among 1964 MPA and 3462 tacrolimus trough levels, the average MPA trough level was 3.2 (1.5) mg/L and the average tacrolimus level was 6.7 (2.8) ng/mL. At last follow‐up, only 5/32 patients had undetectable DSA, with 5/32 having no class I antibodies and 6/32 having no class II antibodies. DSA formation was associated with a lower minimum MPA trough level (0.27 [0.23] vs. 0.47 [0.18] mg) and cystatin C eGFR (48 [21] vs. 70 [23] mL/min/1.73 m²) for class I DSA formers. The average eGFR of patients without class I DSA was 70 (23) mL/min/1.73 m², whereas the average eGFR of patients with class I DSA was 48 (21) mL/min/1.73 m² (p = 0.0071). MPA trough levels <1.3 mg/L long‐term post‐transplantation are associated with the formation of DSA. The association between the formation of DSA and minimum MPA exposure may support a strategy for preventing the formation of DSA.     

Physical activity and its correlates in children and adolescents post‐liver transplant

The health benefits of PA are well established for healthy and chronically ill children. This study objectively measures physical fitness and PA levels in children PLT and explores potential correlates and perceived barriers impacting their PA. A total of 23 children (16 females, mean 14.01 ± 2.49 yrs) >1 yr PLT were assessed for peak oxygen consumption (VO₂peak), muscle strength, endurance, and flexibility. MVPA and steps/day were determined with accelerometry. Additionally, SE, perceived fatigue, and barriers and benefits of PA were examined. VO₂peak (mean 33. 2 ± 7.61 mL/kg/min; 77.0 ± 15.6% predicted) and PA (average 6841 ± 2299 steps/day) were below healthy norms. MVPA (31.6 ± 16.1 min/day) was lower than national guidelines. Six participants (30%) attained criterion standards for abdominal strength and one participant (5%) for push‐ups. Fatigue and SE were lower than reported levels in healthy children. A commonly perceived barrier to PA was “I am tired.” A positive correlation was shown between SE and MVPA (r = 0.57, p = 0.007), SE and fatigue (r = 0.54, p = 0.01), and PELD score and fatigue (r = 0.66, p = 0.007). Children PLT demonstrate below normal levels of PA and aerobic capacity. SE is a modifiable correlate of their PA. Further investigation of the impact of PA correlates can guide the development of future innovative PA intervention strategies in children PLT.     

What is the intrapatient variability of mycophenolic acid trough levels?

TDM of MPA, the active compound of MMF, is rarely used despite its substantial intra‐ and interpatient variability. Little is known about the utility of long‐term MPA TDM. Data are expressed as mean (one standard deviation). All available data from 27 renal transplant recipients (mean age at transplantation: 7.7 [5.0] yr) with an average follow‐up of 9.3 (4.6) yr were analyzed. MPA levels were measured using the EMIT. GFR was measured using cystatin C and eGFR was calculated using the Filler formula. Intrapatient CV of the trough level was calculated as the ratio of the mean divided by one standard deviation. Mean cystatin C eGFR was 56.9 (24.4) mL/min/1.73 m². There was a weak but significant correlation between the MPA trough level and the AUC (Spearman r = 0.6592, p < 0.0001). A total of 1964 MPA trough levels (73 [45]/patient) were measured, as compared to 3462 Tac trough levels (144 [71]/patient). The average MPA trough level was 3.01 (1.26) mg/L and the average trough Tac level was 7.3 (1.8) ng/mL. Intrapatient CV was statistically higher (p = 0.00093) for MPA at 0.68 (0.29) when compared to Tac with a CV of 0.46 (0.12). CV did not correlate with eGFR. Intrapatient MPA trough level CV is significantly higher than for Tac, while CV for both MPA and Tac was high. MPA trough level monitoring may be a feasible monitoring option to improve patient exposure and possibly outcomes.     

拉莫三嗪、丙戊酸钠对癫(癎)儿童认知功能的影响

目的：探讨拉莫三嗪（LTG）和丙戊酸钠（VPA）对癫痫儿童认知功能的影响。方法：首次确诊的癫痫患儿76例中，36例用LTG单药治疗，40例用VAP单药治疗。用药6个月前后对二组进行智力（IQ）测定。同时选取20例健康儿童作为健康对照组。结果：1．癫痫患儿语言智商（VIQ）、操作智商（PIQ）和总智商（FIQ）明显低于健康对照组，各项分测验得分亦均降低（Pa〈0．05）。2．癫痫患儿用LTG治疗6个月后VIQ、PIQ、FIQ及各项分测验得分较用药前无明显变化（Pa〉0．05）；癫痫患儿用VPA治疗6个月后VIQ、PIQ、FIQ无明显变化（Pa〉0．05），而在分测验中知识项得分用药后比用药前显著提高（P〈0．05），编码、木块图项得分显著下降（Pa〈0．05）。结论：癫痫患儿易发生认知功能损害，且损害无选择性；癫痫患儿服用LTG 6个月后对认知功能无影响；服用VPA 6个月后FIQ未见明显变化，但在木块图和编码上有降低，而在知识项得分用药后比用药前提高，表明VPA主要影响右脑功能，而对左脑无影响。     

Comparison of steady-state pharmacokinetics of valproic acid in children between monotherapy and multiple antiepileptic drug treatment

Steady-state pharmacokinetics of valproic acid (VPA) with or without other antiepileptic drug (AED) treatment were studied in 37 children. Children (N = 16) receiving multiple AED therapy had a higher clearance (23.5 vs 13.0 ml/hr/kg, P less than 0.001), larger volume of distribution (0.30 vs 0.22 L/kg, P less than 0.01), and shorter half-life (9.4 vs 12.3 hours, P less than 0.01) than did those (n = 21) receiving VPA only. Inverse correlations of age with clearance (R = -0.559, P less than 0.01) and apparent volume of distribution of VPA (r = -0.490, P less than 0.05) were observed in children receiving monotherapy. In determining the dose and dosing interval of VPA, consider a possible alteration in the pharmacokinetics relating to age and other concurrent AED therapy.     

Assessment of quality of life in children with peanut allergy

Children with a peanut allergy (PA) are faced with food and social restrictions due to the potentially life-threatening nature of their disease, for which there is no cure or treatment. This inevitably impacts upon their quality of life (QoL). QoL of 20 children with PA and 20 children with insulin-dependent diabetes mellitus (IDDM) was measured using two disease-specific QoL questionnaires (higher scores correspond to a poorer QoL). One questionnaire was designed by us and the other was adapted from the Vespid Allergy QoL questionnaire. We gave subjects cameras to record how their QoL is affected over a 24-h period. Response rates for both questionnaires were 100%. Mean ages were 9.0 and 10.4 years for PA and IDDM subjects, respectively. Children with a PA reported a poorer quality of life than children with IDDM: mean scores were 54.85 for PA subjects and 46.40 for diabetics (p = 0.004) in questionnaire 1 and 54.30 and 34.50 (p≤0.001) in questionnaire 2. PA children reported more fear of an adverse event and more anxiety about eating, especially when eating away from home. Photographs fell into seven common categories: food, management, environment, away from home, physical activities, restaurant and people. Most photographs related to food and management issues and revealed difficulties for both groups regarding food restrictions. PA subjects felt more threatened by potential hazards within their environment, felt more restricted by their PA regarding physical activities, and worried more about being away from home. However, they felt safe when carrying epinephrine kits and were positive about eating at familiar restaurants. The QoL in children with PA is more impaired than in children with IDDM. Their anxiety may be considered useful in some situations, promoting better adherence to allergen avoidance advice and rescue plans.     

托吡酯、丙戊酸钠、硝西泮治疗儿童睡眠中癫(癎)性电持续状态的疗效

目的探讨托吡酯(TPM)、丙戊酸钠(VPA)、硝西泮(NZP)治疗儿童睡眠中癫性电持续状态(ESES)的疗效。方法将本院2000年1月-2006年7月首诊的ESES患儿30例,随机分为TPM、VPA二组,每组15例。分别予TPM、VPA治疗。随访6个月,有效者继续治疗;无效者加用NZP治疗,继续随访6个月,并对结果进行分析。结果治疗6个月TPM组有效7例,有效率46.7%;VPA组1例治疗1个月因肝功能损害改为氯硝西泮治疗,余14例中有效7例,有效率为50.0%。二组有效率比较无显著性差异(P>0.05)。二组治疗有效者继续观察6个月后疗效良好。TPM与NZP合用8例,有效6例(75%);VPA与NZP合用7例,有效5例(71.4%),二组疗效比较无显著性差异(P>0.05)。结论TPM、VPA单药治疗ESES有一定疗效,合用NZP效果明显,可作为治疗ESES的首选方案。     

Physical activity in patients with oligo- and polyarticular juvenile idiopathic arthritis diagnosed in the era of biologics: a controlled cross-sectional study

Background

Knowledge about objectively measured levels of physical activity (PA) and PA participation (included facilitators and barriers for PA) in patients with juvenile idiopathic arthritis (JIA) diagnosed in the era of biologics is limited. We aimed to compare objectively measured PA in patients with oligo- and polyarticular JIA diagnosed in the biologic era with controls and to examine associations between PA and disease variables; furthermore, to explore participation in PA, physical education (PE) and facilitators and barriers for PA participation in patients and controls.

Methods

The study cohort included 60 patients (30 persistent oligo JIA/30 poly-articular disease) and 60 age- and sex-matched controls. Age range was 10–16 years and 83% were female. PA was measured with accelerometry for seven consecutive days. Disease activity, current treatment, disease duration, functional ability, pain and fatigue were assessed. Structured interviews were applied to explore participation in PA and PE, and PA facilitators and barriers.

Results

Patients spent less time in daily vigorous PA than controls, (mean(SE) 21(2) min vs. 26(2) min, p?=?0.02), while counts per minute (cpm), steps daily, sedentary time and light and moderate PA did not differ. No differences were found between JIA subgroups. The use of biologic medication was associated with higher cpm and lower sedentary time. Most patients and controls participated in organized or unorganized PA and PE, and enjoyment was the most reported facilitator for PA participation. More patients than controls reported pain as a PA barrier.

Conclusion

The PA levels and participation in patients with oligo- and polyarticular JIA are mostly comparable to controls, but patients still need to be encouraged to increase vigorous PA. Enjoyment is the most important facilitator for PA participation in patients with JIA.