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Identifying Risk Profiles for Nonadherence to the 24-Hour Movement Guidelines for Children and Youth 6 Months Into the COVID-19 Pandemic

Michelle D. Guerrero, Sarah Moore, Guy Faulkner, Karen C. Roberts, Raktim Mitra, Leigh M. Vanderloo, Ryan E. Rhodes, and Mark S. Tremblay

Purpose: The purposes of the current study were to identify risk profiles for nonadherence among children and youth (5–17 y) at the 6-month mark of the COVID-19 pandemic and to discuss similarities and differences between risk profiles identified in the current study and those identified at the 1-month mark of the pandemic. Methods: Data were part of a nationally representative sample of 1143 parents (M age = 43.07 y, SD = 8.16) of children and youth (5–17 y) living in Canada. Survey data were collected in October 2020. Results: Results showed that 3.8% met all movement behavior recommendations, 16.2% met the physical activity recommendation, 27% met the screen time recommendation, and 63.8% met the sleep recommendation. Characteristics associated with nonadherence to all movement behaviors included low parental perceived capability to restrict screen time and decreased overall time spent outdoors. Characteristics associated with nonadherence to the physical activity and screen time recommendations included youth (12–17 y), low parental perceived capability to restrict screen time, decreased time spent outdoors, and increased screen time. Conclusion: Results emphasized the importance of parental perceived capability to restrict screen time and children’s and youth’s outdoor time and showed that pandemic-related factors have impacted children and youth differently.

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Reliability of Fitness Assessments in Children With Emotional and Behavioral Difficulties

Ashley C. Almarjawi, Kemi E. Wright, Brett D. Buist, John Cairney, Tony T. Ton, and Bonnie J. Furzer

Purpose: Examine the reliability of field-based fitness assessments in school-aged children with emotional or behavioral difficulties (EBD). Understanding the impact of fitness on physical activity participation for children with EBD is limited by our ability to reliably measure it. Methods: Fifteen children aged 7–12 years with EBD completed 7 assessments—standing broad jump, overhead throw, grip strength, isometric plank hold, isometric wall squat, unilateral heel raise, and modified 6-minute walk test—in a random order on 2 separate occasions. Intraclass correlation coefficients (ICCs) were computed to evaluate reliability. Results: ICCs ranged from .65 to .99 representing moderate to excellent reliability for all assessments. Shorter assessments requiring less attention and behavior regulation tended to demonstrate higher ICC values while assessments with greater attention or behavioral regulation demands tended to have lower ICC values. Conclusion: Results demonstrate varied reliability for fitness tests in children with EBD. Practitioners can use grip strength and standing broad jump assessments with confidence. Other assessments have good reliability but greater variability indicating they may be a challenge for some children with EBD.

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Associations Among Physical Activity, Adiposity, and Insulin Resistance in Children Exposed In Utero to Maternal Obesity With and Without Gestational Diabetes

Bethany A. Moore, Makenzie L. Callahan, Samantha L. Martin, Alysha Everett, W. Timothy Garvey, and Paula Chandler-Laney

Purpose: Investigate whether obesity risk and current weight status are independently associated with physical activity (PA) and whether PA is associated with adiposity and insulin resistance (homeostatic model assessment of insulin resistance) among children with high versus low obesity risk based on in utero exposure to maternal overweight/obesity with gestational diabetes mellitus (GDM; high risk) or without GDM (overweight/obesity; high risk) or maternal normal weight without GDM (low risk). Method: Secondary analysis of data from children born to women with overweight/obesity and GDM, overweight/obesity without GDM, or normal weight without GDM. PA was assessed with accelerometry, percentage of body fat derived from anthropometrics, and homeostatic model assessment of insulin resistance calculated from glucose and insulin. Results: Among 4- to 10-year-old children (N = 163), analyses of covariance showed that children with a current BMI ≥85th percentile had less vigorous PA than those with BMI <85th percentile, but in utero exposure was not an independent predictor of PA. In linear regression modeling, moderate to vigorous PA was inversely associated with percentage of body fat and homeostatic model assessment of insulin resistance independent of age, Tanner stage, and accelerometer wear time, with stronger associations in high-risk groups. Conclusions: Children’s PA is related to current weight status but not underlying risk for obesity but may be especially important to reduce obesity and insulin resistance in high-risk children.

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Does Regular Exercise Impact the Lung Function of Healthy Children and Adolescents? A Systematic Review and Meta-Analysis

Fernanda Balbinot, Felipe César de Almeida Claudino, Pedro Kazlauckas Lucas, Ana Paula Donadello Martins, Eliana M. Wendland, and Margaret W. Gerbase

Purpose: To assess the quality of the available evidence on the effect of exercise for the improvement of lung function in healthy children and adolescents. Method: We performed a systematic review and meta-analysis of intervention studies examining the effects of regular exercise on spirometric parameters of healthy children and adolescents aged ≤18 years. Results: Within the exercise groups, there were significant improvements in forced vital capacity (mean difference: 0.17 L; 95% confidence interval, 0.07 to 0.26; P < .05) and forced expiratory volume in the first second (mean difference: 0.14 L; 95% confidence interval, 0.06 to 0.22; P < .05). Results were consistent across different age groups and duration of interventions. In the between-group analysis, forced vital capacity, forced expiratory volume in the first second, and peak expiratory flow were higher in the exercise group compared with the nonexercise group, but the differences did not reach statistical relevance. There was significant statistical heterogeneity between studies. Conclusion: Regular exercise has the potential to improve lung function parameters in healthy children and adolescents; however, the small number of studies and the heterogeneity between them raise concern about the quality of the currently available evidence. These findings bring to attention the need for well-designed trials addressing this important public health issue.

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Aqua-Plyometric Exercises-Induced Changes in Muscle Strength, Bone Mineral Properties, and Physical Fitness in Patients With Juvenile Idiopathic Arthritis: A 12-Week, Randomized Controlled Trial

Ragab K. Elnaggar and Mahmoud S. Elfakharany

Purpose: To determine whether a 12-week, lower body-targeted aqua-plyometric (AquaPlyo) exercise program could improve muscle strength, bone mineral properties, and physical fitness in patients with juvenile idiopathic arthritis. Methods: A randomized controlled trial was adopted and included 48 patients with polyarticular juvenile idiopathic arthritis (age: 12–18 y). Patients were assigned to undergo either AquaPlyo exercises (AquaPlyo group, n = 24) or standard exercises (control group, n = 24). The outcome measures were assessed pretreatment and posttreatment and included concentric quadriceps peak torque, bone mineral properties (areal bone mineral density [BMD], volumetric BMD, bone mineral content, and BMD Z score), and physical fitness. Results: A significant posttreatment increase in the concentric quadriceps peak torque was detected in the AquaPlyo group compared with the control group (either at an angular velocity of 90°/s [right side: P = .016, left side: P = .025] or 180°/s [right side: P = .007, left side: P = .029]). Besides, a considerably greater improvement in the areal BMD (P = .0006), volumetric BMD (P = .027), bone mineral content (P = .002), and BMD Z score (P = .0004) was observed in the AquaPlyo group. Moreover, a remarkably greater rise in the physical fitness (P < .001) was revealed in the AquaPlyo group. Conclusion: AquaPlyo training can efficiently enhance muscle strength, improve bone mineral properties, and boost physical fitness in patients with juvenile idiopathic arthritis.

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Arterial Structure in 18-Year-Old Males Is Dependent on Physical Activity at 12 Years and Cumulative Cardiorespiratory Fitness From Puberty to Late Adolescence

Juta Kraav, Reeli Tamme, Liina Remmel, Evelin Mäestu, Maksim Zagura, Jaak Jürimäe, and Vallo Tillmann

Purpose: To evaluate the long-term effect of body composition, physical activity, and cardiorespiratory fitness (CRF) from puberty on arterial health in late adolescent males. Methods: The cumulative burden of physical activity (measured with accelerometer), CRF (VO2peak0.82), and body composition (body mass index, fat mass, and fat percentage) from puberty to late adolescence (sum of 4 time points from 12 to 18 y) was assessed in 102 males. Additional analysis on the first (T1) and last (T4) time points was performed. Intima-media thickness (IMT), carotid-femoral pulse wave velocity, and augmentation index adjusted to heart rate of 75 beats per minute (bpm) as dependent variables were measured at T4 and analyzed in multivariable regression models adjusted for known risk factors including maturation, blood pressure, and smoking habits. Results: T1 and cumulative body composition measures were independently associated with IMT, while cumulative (β = −0.011, P = .036) and T4 (β = −0.0.031, P = .001) CRF revealed independent associations with IMT. Individuals with moderate to vigorous physical activity >60 minutes per day at T1 showed relationship (β = −1.091, P = .026) with IMT independently of late adolescent physical activity. No significant relationship was present for arterial function. Conclusion: Arterial structure in adolescent males is associated with physical activity at 12 years while relationship with CRF can be seen in late adolescence and cumulatively from puberty to late adolescence.

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Metabolic Flexibility During Exercise in Children with Overweight/Obesity Versus Children who are Lean

Brandon Dykstra, Dillon Kuszmaul, and Anthony D. Mahon

Purpose: This study examined metabolic flexibility with respect to fat metabolism during exercise in children who are lean (n=11; 10.9[0.9] y) and overweight/obese (OW/OB; n=9; 10.3[1.2] y). Method: Participants were grouped based on body mass index percentiles for age and sex. Groups were mixed in age and sex. Participants completed two 20-minute exercise bouts on a cycle ergometer, separated by a 10-minute rest. Bout 1 consisted of 10 minutes at 50% VO2peak and 10 minutes at 75% VO2peak. Bout 2 was 20 minutes at 50% VO2peak. Absolute fat oxidation rate (FOR), FOR relative to body mass, FOR relative to fat-free mass, and proportional fat use were measured at 10 minutes of bout 1 and 5, 10, 15, and 20 minutes of bout 2. Results: Absolute FOR was higher in the OW/OB group (range: 117.8 [55.1]–206.2 [48.3] mg·min−1) than in the lean group (81.1 [32.2]–152.2 [38.2] mg·min−1); however, there were no significant main effects for group or significant interactions for proportional fat use, FOR relative to body mass, or FOR relative to fat-free mass. Conclusion: Children in this age range who are overweight/obese do not display impaired metabolic flexibility with respect to fat metabolism during exercise.

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Volume 34 (2022): Issue 4 (Nov 2022)

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Volume 34 (2022): Issue S1 (Nov 2022)

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Adolescent Bone Advantages 3 Years After Resistance Training Trial

Jill Thein-Nissenbaum, Deena M. Weiss, Stephanie A. Kliethermes, and Tamara A. Scerpella

Purpose: We assessed maintenance of skeletal advantages 3 years after completion of a 2-year, school-based, controlled exercise trial in adolescent girls. Method: Middle-school girls participated in a resistance training program embedded in physical education classes. Effort groups (low-effort group [LO] and high-effort group [HI]) were identified; the control group (CON) participated in standard physical education at a separate school. Baseline and follow-up (FU) assessments at 6, 18, and 54 (FU3) months included densitometry, anthropometry, and questionnaires assessing physical maturity and nonintervention organized physical activity. Linear mixed effects models were fit to evaluate bone outcomes across all FU time points for CON versus LO/HI. Results: Sixty-eight girls (23 CON/25 HI/20 LO) were 11.6 (0.3) years at baseline. Bone parameters did not differ at baseline, except femoral neck bone mineral density (LO < HI/CON, P < .05). Forty-seven participants provided FU3 assessment: 17 CON/16 HI/14 LO. After adjusting for height, gynecologic age, baseline bone, and organized physical activity, bone gains across all time points were greater for HI versus CON for legs bone mineral content, femoral neck bone mineral content/bone mineral density, and third lumbar vertebra bone mineral content/bone mineral density (P ≤ .05). At FU3, bone values were greater for HI versus CON at subhead, legs, femoral neck, and third lumbar vertebra (P < .03). Conclusion: Adolescent girls who exerted high effort in a school-based resistance training program demonstrated significant skeletal benefits 3 years after program completion.