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The Health Risks of Obesity Have Not Been Exaggerated.

Sat, 08/17/2019 - 23:10
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The Health Risks of Obesity Have Not Been Exaggerated.

Med Sci Sports Exerc. 2019 01;51(1):222-225

Authors: Jakicic JM, Rogers RJ, Donnelly JE

PMID: 30550507 [PubMed - indexed for MEDLINE]

Individual and family-based approaches to increase physical activity in adolescents with intellectual and developmental disabilities: Rationale and design for an 18 month randomized trial.

Sat, 07/27/2019 - 22:10
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Individual and family-based approaches to increase physical activity in adolescents with intellectual and developmental disabilities: Rationale and design for an 18 month randomized trial.

Contemp Clin Trials. 2019 Jul 22;84:105817

Authors: Ptomey LT, Washburn RA, Lee J, Greene JL, Szabo-Reed AN, Sherman JR, Danon JC, Osborne LN, Little TD, Donnelly JE

Abstract
Adolescents with intellectual and developmental disabilities (IDD) are less physically active and have lower cardiovascular fitness compared with their typically developing peers. This population faces additional barriers to participation in moderate-to-vigorous physical activity (MVPA) such as reliance on parents, lack of peer-support, and lack of inclusive physical activity opportunities. Previous interventions to increase MVPA in adolescents with IDD have met with limited success, at least in part due to requiring parents to transport their adolescent to an exercise facility. We recently developed a remote system to deliver MVPA to groups of adolescents with IDD in their homes via video conferencing on a tablet computer. This approach eliminates the need for transportation and provides social interaction and support from both a health coach and other participants. We will conduct a 18-mo. trial (6 mos. active, 6 mos. maintenance, 6 mos. no-contact follow-up) to compare changes in objectively assessed MVPA in 114 adolescents with IDD randomized to a single level intervention delivered only to the adolescent (AO) or a multi-level intervention delivered to both the adolescent and a parent (A + P). Our primary aim is to compare increases in MVPA (min/d) between the AO and A + P groups from 0 to 6 mos. Secondarily we will compare changes in MVPA, sedentary time, cardiovascular fitness, muscular strength, motor ability, quality of life, and the percentage of adolescents achieving the US recommendation of 60 min. MVPA/d across 18 mos. We will also explore the influence of process variables/participant characteristics on changes in MVPA across 18 mos. NCT registration: NCT03684512.

PMID: 31344519 [PubMed - as supplied by publisher]

The effects of exercise session timing on weight loss and components of energy balance: midwest exercise trial 2.

Sat, 07/13/2019 - 21:10

The effects of exercise session timing on weight loss and components of energy balance: midwest exercise trial 2.

Int J Obes (Lond). 2019 Jul 09;:

Authors: Willis EA, Creasy SA, Honas JJ, Melanson EL, Donnelly JE

Abstract
BACKGROUND/OBJECTIVES: Circadian physiology has been linked to body weight regulation and obesity. To date, few studies have assessed the association between exercise timing and weight related outcomes. The aim of this secondary analysis was to explore the impact of exercise timing (i.e., 24 h clock time of exercise session) on weight loss and components of energy balance.
SUBJECTS/METHODS: Overweight/obese (BMI 25.0-39.9 kg/m2), physically inactive, young adults (~51% female) completed a 10-month supervised exercise program (400 or 600 kcal/session for 5 days/week) or served as non-exercise controls (CON). Participants were categorized based on the time of day in which they completed exercise sessions (Early-Ex: >50% of sessions completed between 7:00 and 11:59 am; (n = 21), Late-Ex: >50% of sessions completed between 3:00 and 7:00 pm; (n = 25), Sporadic-Ex: <50% of sessions completed in any time category; (n = 24), and CON; (n = 18)). Body weight, energy intake (EI; digital photography), and non-exercise physical activity (NEPA; accelerometer) were assessed at baseline, 3.5, 7, and 10 months. Total daily energy expenditure (TDEE; doubly labeled water), was assessed at baseline and 10 months.
RESULTS: At month 10, weight loss was significantly greater in both Early-EX (-7.2 ± 1.2%; p < 0.001) and Sporadic-EX (- 5.5 ± 1.2%; p = 0.01) vs CON (+0.5 ± 1.0%), and Early-EX vs Late-EX (-2.1 ± 1.0%; p < 0.001). There were no between group differences for change in TDEE, EI, and non-exercise energy expenditure (P > 0.05). A significant group × time interaction (p = 0.02) was observed for NEPA (counts/min), however, after adjusting for multiple comparisons, group effects were no longer significant.
CONCLUSIONS: Despite minimal differences in components of energy balance, Early-EX lost significantly more weight compared with Late-Ex. Although the mechanisms are unclear, the timing of exercise may be important for body weight regulation.

PMID: 31289334 [PubMed - as supplied by publisher]

The Feasibility of Group Video Conferencing for Promotion of Physical Activity in Adolescents With Intellectual and Developmental Disabilities.

Sat, 07/06/2019 - 21:09
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The Feasibility of Group Video Conferencing for Promotion of Physical Activity in Adolescents With Intellectual and Developmental Disabilities.

Am J Intellect Dev Disabil. 2017 11;122(6):525-538

Authors: Ptomey LT, Willis EA, Greene JL, Danon JC, Chumley TK, Washburn RA, Donnelly JE

Abstract
Physical activity (PA) rates of adolescents with intellectual and developmental disabilities (IDD) are low and effective strategies for increasing PA are limited. The purpose of this study was to assess the feasibility of a group-based PA intervention that was delivered remotely to adolescents with IDD. Participants attended 30-min group PA sessions 3 times a week. PA sessions were delivered in their homes by video conferencing on a tablet computer. Thirty-one participants enrolled and 29 completed the 12-week intervention. Participants attended 77.2% ± 20.8% of scheduled sessions and averaged 26.7 ± 2.8 min of PA/session, with 11.8 ± 4.8 min at moderate- to vigorous intensity. Group-based PA delivered remotely may be a feasible approach for the promotion of PA in adolescents with IDD.

PMID: 29115872 [PubMed - indexed for MEDLINE]


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