Insulin and Weight Status in Adolescents: Independent Effects of Intensity of Physical Activity and Peak Aerobic Power

2008 ◽  
Vol 20 (1) ◽  
pp. 29-39 ◽  
Author(s):  
Daniela A. Rubin ◽  
Robert G. McMurray ◽  
Joanne S. Harrell
Keyword(s):  
Physical Activity ◽  
Weight Status ◽  
Aerobic Power ◽  
Vigorous Physical Activity ◽  
Normal Weight ◽  
Habitual Physical Activity ◽  
Fat Free Mass ◽  
Fasting Insulin ◽  
Overweight Adolescents ◽  
Independent Effects

Differences in insulin concentrations between normal weight or overweight adolescents (n = 437) were determined depending on their habitual physical activity (PA) and aerobic power (pVO2max). Tertiles were computed for PA (survey) and pVO2max (submaximal predicted cycle test). Independent of their weight, adolescents in the upper 2 tertiles for vigorous PA had lower insulin concentrations than those in the bottom tertile (p < .05). Adolescents in the top tertile for pVO2max expressed per kg fat-free mass also had lower insulin concentrations than those in the medium and bottom tertiles (p = .002). In youth, vigorous physical activity and aerobic power are associated with fasting insulin independent of weight status.

scholarly journals Children’s moderate-to-vigorous physical activity on weekdays versus weekend days: a multi-country analysis

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Keith Brazendale ◽  
◽  
Michael W. Beets ◽  
Bridget Armstrong ◽  
R. Glenn Weaver ◽  
...  
Keyword(s):  
Physical Activity ◽  
Weight Status ◽  
Vigorous Physical Activity ◽  
Normal Weight ◽  
Analytical Models ◽  
Accelerometer Data ◽  
Inclusion Criteria ◽  
Total Wear ◽  
Valid Data ◽  
Country Analysis

Abstract Purpose The Structured Days Hypothesis (SDH) posits that children’s behaviors associated with obesity – such as physical activity – are more favorable on days that contain more ‘structure’ (i.e., a pre-planned, segmented, and adult-supervised environment) such as school weekdays, compared to days with less structure, such as weekend days. The purpose of this study was to compare children’s moderate-to-vigorous physical activity (MVPA) levels on weekdays versus weekend days using a large, multi-country, accelerometer-measured physical activity dataset. Methods Data were received from the International Children’s Accelerometer Database (ICAD) July 2019. The ICAD inclusion criteria for a valid day of wear, only non-intervention data (e.g., baseline intervention data), children with at least 1 weekday and 1 weekend day, and ICAD studies with data collected exclusively during school months, were included for analyses. Mixed effects models accounting for the nested nature of the data (i.e., days within children) assessed MVPA minutes per day (min/day MVPA) differences between weekdays and weekend days by region/country, adjusted for age, sex, and total wear time. Separate meta-analytical models explored differences by age and country/region for sex and child weight-status. Results/findings Valid data from 15 studies representing 5794 children (61% female, 10.7 ± 2.1 yrs., 24% with overweight/obesity) and 35,263 days of valid accelerometer data from 5 distinct countries/regions were used. Boys and girls accumulated 12.6 min/day (95% CI: 9.0, 16.2) and 9.4 min/day (95% CI: 7.2, 11.6) more MVPA on weekdays versus weekend days, respectively. Children from mainland Europe had the largest differences (17.1 min/day more MVPA on weekdays versus weekend days, 95% CI: 15.3, 19.0) compared to the other countries/regions. Children who were classified as overweight/obese or normal weight/underweight accumulated 9.5 min/day (95% CI: 6.9, 12.2) and 10.9 min/day (95% CI: 8.3, 13.5) of additional MVPA on weekdays versus weekend days, respectively. Conclusions Children from multiple countries/regions accumulated significantly more MVPA on weekdays versus weekend days during school months. This finding aligns with the SDH and warrants future intervention studies to prioritize less-structured days, such as weekend days, and to consider providing opportunities for all children to access additional opportunities to be active.

Accelerometer Response to Physical Activity Intensity in Normal-Weight Versus Overweight African American Children

2011 ◽  
Vol 8 (5) ◽  
pp. 682-692 ◽  
Author(s):  
Daniel Arvidsson ◽  
Mark Fitch ◽  
Mark L. Hudes ◽  
Catrine Tudor-Locke ◽  
Sharon E. Fleming
Keyword(s):  
Physical Activity ◽  
African American ◽  
Weight Status ◽  
Normal Weight ◽  
Fat Free Mass ◽  
African American Children ◽  
Overweight Children ◽  
Physical Activity Intensity ◽  
Activity Intensity ◽  
American Children

Background:Different movement efficiency in overweight children may affect accelerometer output data. The purpose was to investigate the ability of accelerometers to assess physical activity intensity and number of steps in normal-weight compared with overweight children.Methods:Eleven normal-weight and 14 overweight African American children walked at 2, 4, 5, and 6 km/h on a treadmill wearing Lifecorder, ActiGraph, RT3, and Biotrainer. Oxygen uptake was measured and steps manually counted. Fat free mass (FFM) was assessed from bioelectrical impedance analysis. Accelerometer counts and the individual linear regression lines of accelerometer counts versus VO2/FFM were evaluated, together with steps recorded by Lifecorder and Actigraph.Results:Correlations between accelerometer counts and VO2/FFM for all monitors were r ≥ .95 (P < .01). The accelerometer counts and their relationship to VO2/FFM did not generally differ significantly by body weight status. Lifecorder and Actigraph underestimated steps at 4, 5, and 6 km/h by less than 9%, but the error was up to −95% at 2 km/h.Conclusions:All 4 accelerometers show high ability to assess physical activity intensity, and can be used to compare physical activity between normal-weight and overweight children. The Lifecorder and the ActiGraph showed high accuracy in assessing steps, providing speed of movement exceeded 2 km/h.

scholarly journals Factors associated with accelerometer measured movement behaviours among White British and South Asian children aged 6–8 years during school terms and school holidays

BMJ Open ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. e025071 ◽  
Author(s):  
Liana Carmen Nagy ◽  
Muhammad Faisal ◽  
Maria Horne ◽  
Paul Collings ◽  
Sally Barber ◽  
...  
Keyword(s):  
Physical Activity ◽  
South Asian ◽  
Primary Schools ◽  
Weight Status ◽  
Vigorous Physical Activity ◽  
Multilevel Modelling ◽  
Normal Weight ◽  
Obese Children ◽  
Cross Sectional ◽  
Factors Associated

ObjectivesTo investigate factors associated with movement behaviours among White British (WB) and South Asian (SA) children aged 6–8 years during school terms and holidays.DesignCross-sectional.SettingThree primary schools from the Bradford area, UK.ParticipantsOne hundred and sixty WB and SA children aged 6–8 years.Primary and secondary outcomesSedentary behaviour (SB), light physical activity (LPA) and moderate-to-vigorous physical activity (MVPA) measured by accelerometry during summer, winter and spring and during school terms and school holidays. Data were analysed using multivariate mixed-effects multilevel modelling with robust SEs. Factors of interest were ethnicity, holiday/term, sex, socioeconomic status (SES), weight status, weekend/weekday and season.ResultsOne hundred and eight children (67.5%) provided 1157 valid days of data. Fifty-nine per cent of children were WB (n=64) and 41% (n=44) were SA. Boys spent more time in MVPA (11 min/day, p=0.013) compared with girls and SA children spent more time in SB (39 min, p=0.017) compared with WB children in adjusted models. Children living in higher SES areas were more sedentary (43 min, p=0.006) than children living in low SES areas. Children were more active during summer (15 min MVPA, p<0.001; 27 LPA, p<0.001) and spring (15 min MVPA, p=0.005; 38 min LPA, p<0.001) and less sedentary (−42 min and −53 min, p<0.001) compared with winter. Less time (8 min, p=0.012) was spent in LPA during school terms compared with school holidays. Children spent more time in MVPA (5 min, p=0.036) during weekend compared with weekdays. Overweight and obese children spent more time in LPA (21 min, p=0.021) than normal-weight children.ConclusionThe results of our study suggest that significant child level factors associated with movement behaviours are ethnicity, sex, weight-status and area SES. Significant temporal factors are weekends, school holidays and seasonality. Interventions to support health enhancing movement behaviours may need to be tailored around these factors.

scholarly journals Does the Effect of a Physical Activity Behavioral Intervention Vary by Characteristics of People with Multiple Sclerosis?

2015 ◽  
Vol 17 (2) ◽  
pp. 65-72 ◽  
Author(s):  
Robert W. Motl ◽  
Deirdre Dlugonski ◽  
Lara A. Pilutti ◽  
Rachel E. Klaren
Keyword(s):  
Physical Activity ◽  
Multiple Sclerosis ◽  
Behavioral Intervention ◽  
Behavioral Interventions ◽  
Weight Status ◽  
Interindividual Variability ◽  
Vigorous Physical Activity ◽  
Normal Weight ◽  
Analysis Of Covariance ◽  
Disability Status

Background: Behavioral interventions have significantly increased physical activity in people with multiple sclerosis (MS). Nevertheless, there has been interindividual variability in the pattern and magnitude of change. This study documented the efficacy and variability of a behavioral intervention for changing physical activity and examined the possibility that efficacy varied by the characteristics of individuals with MS. Methods: Eighty-two people with MS were randomly assigned to one of two conditions: behavioral intervention (n = 41) or waitlist control (n = 41). We collected information before the study on MS type, disability status, weight status based on body-mass index, and current medications. Furthermore, all participants completed the Godin Leisure Time Exercise Questionnaire and the abbreviated International Physical Activity Questionnaire and wore an accelerometer for 1 week to measure minutes of moderate-to-vigorous physical activity before and after the 6-month intervention period. Results: Analysis of covariance (ANCOVA) indicated that participants in the behavioral intervention had significantly higher levels of physical activity than control participants after the 6-month period (P &lt; .001). There was substantial interindividual variability in the magnitude of change, and ANCOVA indicated that MS type (relapsing vs. progressive) (P &lt; .01), disability status (mild vs. moderate) (P &lt; .01), and weight status (normal weight vs. overweight/obese) (P &lt; .05) moderated the efficacy of the behavioral intervention. Conclusions: The behavioral intervention was associated with improvements in physical activity, particularly for those with mild disability, relapsing-remitting MS, or normal weight status.

scholarly journals Weight Status Associations With Physical Activity Intensity and Physical Self-Perceptions in 10- to 11-Year-Old Children

2012 ◽  
Vol 24 (1) ◽  
pp. 100-112 ◽  
Author(s):  
Stuart J. Fairclough ◽  
Lynne M. Boddy ◽  
Nicola D. Ridgers ◽  
Gareth Stratton
Keyword(s):  
Physical Activity ◽  
Socioeconomic Status ◽  
Physical Condition ◽  
Weight Status ◽  
Vigorous Physical Activity ◽  
Normal Weight ◽  
Physical Activity Intensity ◽  
Self Perceptions ◽  
Body Attractiveness ◽  
Activity Intensity

The study examined associations between children’s weight status, physical activity intensity, and physical self-perceptions. Data were obtained from 409 children (224 girls) aged 10–11 years categorized as normal-weight or overweight/obese. Physical activity was assessed using accelerometry, and children completed the Physical Self-Perception Profile. After controlling for the effects of age, maturation, and socioeconomic status vigorous physical activity was significantly associated with normal-weight status among boys (OR = 1.13, p = .01) and girls (OR = 1.13, p = .03). Normal-weight status was significantly associated with perceived Physical Condition (Boys: OR = 5.05, p = .008; Girls: OR = 2.50, p = .08), and Body Attractiveness (Boys: OR = 4.44, p = .007; Girls: OR = 2.56, p = .02). Weight status of 10–11 year old children was significantly associated with time spent in vigorous physical activity and self-perceptions of Body Attractiveness and Physical Condition.

Physical Activity, Fitness, and Affective Responses of Normal-Weight and Overweight Adolescents during Physical Education

2006 ◽  
Vol 18 (1) ◽  
pp. 53-63 ◽  
Author(s):  
Stuart Fairclough ◽  
Gareth Stratton
Keyword(s):  
Physical Activity ◽  
Body Mass Index ◽  
Physical Education ◽  
Cardiorespiratory Fitness ◽  
Vigorous Physical Activity ◽  
Perceived Competence ◽  
Normal Weight ◽  
Affective Responses ◽  
Treadmill Test ◽  
Overweight Adolescents

This study investigated the enjoyment and perceived competence of normal-weight (n = 48) and overweight (n = 20) adolescents during physical education (PE) classes. Amount of PE time spent in moderate-to-vigorous (MVPA) and vigorous physical activity (VPA), as well as cardiorespiratory fitness (graded treadmill test) and body composition (body mass index) were also compared. Normal-weight students reported the greatest values for enjoyment (p = .008) and perceived competence (p = .005), though no differences in MVPA and VPA were observed. Cardiorespiratory fitness was highest among normal-weight students (p < .0001). In comparison with normal-weight adolescents, overweight youth might not be provided with optimal psychological experiences during PE classes.

Aerobic Fitness Indices of Children Differed Not by Body Weight Status but by Level of Engagement in Physical Activity

2015 ◽  
Vol 12 (6) ◽  
pp. 854-860 ◽  
Author(s):  
Georges Jabbour ◽  
Melanie Henderson ◽  
Angelo Tremblay ◽  
Marie Eve Mathieu
Keyword(s):  
Physical Activity ◽  
Body Weight ◽  
Lipid Oxidation ◽  
Aerobic Fitness ◽  
Oxidation Rate ◽  
Weight Status ◽  
Vigorous Physical Activity ◽  
Normal Weight ◽  
Obese Children ◽  
Body Weight Status

Objective:Moderate-to-vigorous physical activity (MVPA) improves aerobic fitness in children, which is usually assessed by maximal oxygen consumption. However, other indices of aerobic fitness have been understudied.Methods:To compare net oxygen (VO2net), net energy consumption (Enet), net mechanical efficiency (MEnet), and lipid oxidation rate in active and inactive children across body weight statuses.Design:The sample included normal-weight, overweight, and obese children of whom 44 are active (≥30 min of MVPA/d) and 41 are inactive (<30 min of MVPA/d). VO2net, Enet, MEnet and lipid oxidation rate were determined during an incremental maximal cycling test.Results:Active obese participants had significantly lower values of VO2net and Enet and higher MEnet than inactive obese participants at all load stages. In addition, active obese participants showed a significantly higher lipid oxidation rate compared with inactive obese and active overweight and normal-weight participants. VO2net, Enet, and MEnet were similar across active children, regardless of body weight status.Conclusion:Thirty minutes or more of MVPA per day is associated with a potentiation of aerobic fitness indicators in obese prepubertal children. Moreover, the indices of aerobic fitness of inactive obese children are significantly different from those of active obese and nonobese ones.

The Concurrent Validity of the 3-Day Physical Activity Recall in Australian Youth

2015 ◽  
Vol 27 (2) ◽  
pp. 262-267 ◽  
Author(s):  
James Dollman ◽  
Rebecca Stanley ◽  
Andrew Wilson
Keyword(s):  
Physical Activity ◽  
Weight Status ◽  
Vigorous Physical Activity ◽  
Population Level ◽  
Normal Weight ◽  
Self Report ◽  
Physical Activity Intensity ◽  
Weight Category ◽  
Activity Intensity ◽  
Physical Activity Recall

Valid measurement of youth physical activity is important and self-report methods provide convenient assessments at the population level. There is evidence that the validity of physical activity self-report varies by weight category. The aim of this study was to assess the validity of the 3-Day Physical Activity Recall (3DPAR), separately between normal weight and overweight/obese Australian youth. Accelerometer-derived physical activity variables were compared with 3DPAR variables in 155 (77 females) 11- to 14-year-olds from Adelaide, South Australia. In the whole sample, validity coefficients for self-reported moderate and moderate to vigorous physical activity were modest (rs = 0.12-0.31) and similar across gender and weight status categories. Validity coefficients for self-reported vigorous physical activity were much stronger (rs = 0.59-0.73) among overweight/obese than among normal weight participants. The validity of the 3DPAR in this study was low in the whole sample but varied according to physical activity intensity and the weight status of the child. Specifically, the 3DPAR may be appropriate for describing vigorous intensity physical activity among overweight and obese youth.

scholarly journals The Influence of Friends and Psychosocial Factors on Physical Activity and Screen Time in Normal and Overweight Adolescents: A Mixed-Methods Analysis

2018 ◽  
Vol 33 (1) ◽  
pp. 97-106 ◽  
Author(s):  
Jeanette M. Garcia ◽  
John R. Sirard ◽  
Diane E. Whaley ◽  
David J. Rice ◽  
Kayla Baker ◽  
...  
Keyword(s):  
Physical Activity ◽  
Psychosocial Factors ◽  
Screen Time ◽  
Weight Status ◽  
Vigorous Physical Activity ◽  
Normal Weight ◽  
Focus Group Discussions ◽  
Group Discussions ◽  
Health Related ◽  
And Gender

Background: Understanding factors that influence physical activity (PA) and sedentary behavior is crucial to develop interventions to improve adolescents’ health-related behaviors. Purpose: To compare the influence of friends and psychosocial factors on moderate-to-vigorous physical activity (MVPA) and screen time (ST) between normal weight (NW) and overweight (OW) adolescents. Methods: In all, 21 OW and 21 NW adolescents wore accelerometers and completed questionnaires assessing MVPA, ST, and psychosocial variables. The MVPA and ST were assessed in nominated friends. Adolescents participated in focus groups assessing influence on activity behaviors. Results: There were no differences in MVPA; however, NW adolescents reported less ST than OW adolescents (8.9 vs 13.1 h/wk, P = .04). For OW adolescents, friends’ ST ( P = .002) and psychosocial factors ( P = .05) were associated with ST, while only PA self-efficacy was associated with MVPA. For NW adolescents, only friends’ MVPA ( P = .04) was associated with self-reported PA. Exploratory analyses revealed differences among weight status and gender. Focus group discussions revealed that friends influenced both OW and NW adolescents’ MVPA; however, this appeared to be more apparent for NW males, while psychosocial factors played a role in both OW and NW females. The OW adolescents reported that friends were more of an influence on their ST levels, while NW adolescents indicated that their ST was not affected by their friends’ behaviors. Conclusions: Interventions to increase MVPA and/or decrease ST may need to be tailored for NW and OW adolescents.

scholarly journals Multi-Component Intervention Program on Habitual Physical Activity Parameters and Cognitive Function in Patients with Mild Cognitive Impairment: A Randomized Controlled Trial

2021 ◽  
Vol 18 (12) ◽  
pp. 6240
Author(s):  
Min-Ki Jeong ◽  
Kyung-Won Park ◽  
Je-Kwang Ryu ◽  
Gwon-Min Kim ◽  
Hyun-Hun Jung ◽  
...  
Keyword(s):  
Physical Activity ◽  
Cognitive Impairment ◽  
Mild Cognitive Impairment ◽  
Cognitive Function ◽  
Intervention Program ◽  
Vigorous Physical Activity ◽  
Cognitive Intervention ◽  
Habitual Physical Activity ◽  
Disease Assessment ◽  
Digit Symbol Substitution Test

Age-related dementia refers to a state in which someone experiences multiple cognitive function impairment due to degenerative brain disease, and which causes difficulties in their daily life or social life. Dementia is the most common and serious obstacle in later life. Early intervention in the case of patients who are in the mild cognitive impairment (MCI) stage among the high-risk group can maintain and improve their cognitive function. The purpose of the current trial is aimed at investigating the association between a multi-component (exercise with cognitive) intervention program and habitual physical activity parameters on cognitive functions in MCI patients. Neuropsychological cognitive and depression assessments were performed by neuropsychologists according to normalized methods, including the Korean mini-mental State examination (K-MMSE) and modified Alzheimer’s disease assessment scale-cognitive subscale (ADAS-Cog) and cognitive assessment tool (attention, processing speed), and the Korean version of the geriatric depression scale (SGDS-K), both at baseline and at a 12 weeks follow-up. The 12-week multi-component intervention improved cognitive function and habitual physical activity parameters in patients with MCI relative to controls. A multi-component intervention program for patients with MCI is considered to be an effective method of dementia prevention by improving global (ADAS-Cog) and frontal (trail-making test, digit symbol substitution test) cognition and habitual physical activity parameters such as moderate to vigorous physical activity and step count. In addition, it is important to encourage habitual physical activities to ensure that exercise intervention strategies are carried out at the duration and intensity required for improving physical and cognitive wellbeing and obtaining health benefits.

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