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The effect of physical activity on 18-month weight change in overweight adults.

ABSTRACT: Few studies have been conducted that have examined the long-term effect of different doses of physical activity (PA) on weight change in overweight adults without a prescribed reduction in energy intake. This study examined the effect of different prescribed doses of PA on weight change, body composition, fitness, and PA in overweight adults. Two hundred seventy-eight overweight adults (BMI: 25.0-29.9 kg/m²; age: 18-55 years) with no contraindications to PA were randomized to one of three intervention groups for a period of 18 months. MOD-PA was prescribed 150 min/week and HIGH-PA 300 min/week of PA. Self-help group (SELF) was provided a self-help intervention to increase PA. There was no recommendation to reduce energy intake. MOD-PA and HIGH-PA were delivered in a combination of in-person and telephone contacts across 18 months. 18-month percent weight change was -0.7 ± 4.6% in SELF, -0.9 ± 4.7% in MOD-PA, and -1.2 ± 5.6% in HIGH-PA. Subjects were retrospectively grouped as remaining within ±3% of baseline weight (WT-STABLE), losing >3% of baseline weight (WT-LOSS), or gaining >3% of baseline weight (WT-GAIN) for secondary analyses. 18-month weight change was 0.0 ± 1.3% for WT-STABLE, +5.4 ± 2.6% for WT-GAIN, and -7.4 ± 3.6% for WT-LOSS. 18-month change in PA was 78.2 ± 162.6 min/week for WT-STABLE, 74.7 ± 274.3 for WT-GAIN, and 161.9 ± 252.6 min/week for WT-LOSS. The weight change observed in WT-LOSS was a result of higher PA combined with improved scores on the Eating Behavior Inventory (EBI), reflecting the adoption of eating behaviors to facilitate weight loss. Strategies to facilitate the maintenance of these behaviors are needed to optimize weight control.

SUBMITTER: Jakicic JM

PROVIDER: S-EPMC4427898 | biostudies-literature | 2011 Jan

REPOSITORIES: biostudies-literature

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The effect of physical activity on 18-month weight change in overweight adults.

Jakicic John M JM Otto Amy D AD Lang Wei W Semler Linda L Winters Carena C Polzien Kristen K Mohr Kara I KI

Obesity (Silver Spring, Md.) 20100610 1

Few studies have been conducted that have examined the long-term effect of different doses of physical activity (PA) on weight change in overweight adults without a prescribed reduction in energy intake. This study examined the effect of different prescribed doses of PA on weight change, body composition, fitness, and PA in overweight adults. Two hundred seventy-eight overweight adults (BMI: 25.0-29.9 kg/m²; age: 18-55 years) with no contraindications to PA were randomized to one of three interv ...[more]

PMID: 20539299

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Project description:Background/objectivesTo examine the association between indices of sleep quantity and quality with dietary adherence, physical activity adherence, and weight loss during a behavioral weight loss intervention.MethodsAdults (n = 156) with overweight and obesity (40 ± 9 years, 84% female, BMI: 34.4 ± 4.2 kg/m2) participated in an 18-month behavioral weight loss intervention which prescribed a reduced calorie diet (1200-1800 kcal/d) and increased physical activity (300 min/wk). Body weight, indices of sleep (SenseWear armband; SWA), energy intake (EI, 3-day food records), and moderate-to-vigorous physical activity (SWA) were measured at baseline, 6, 12, and 18 months. Linear mixed effects models examined the association between sleep and weight change over time. Additional models were adjusted for covariates including age, BMI, sex, race, ethnicity, study completion, randomization, EI, and physical activity. Secondary analyses examined the association between sleep and adherence to diet and physical activity recommendations.ResultsMean weight loss was 7.7 ± 5.4, 8.4 ± 7.9, and 7.1 ± 9.0 kg at 6, 12, and 18 months, respectively. Lower sleep efficiency, higher wake after sleep onset (WASO), more awakenings, and higher sleep onset latency (SOL) were significantly associated with attenuated weight loss (p < 0.05). Lower sleep efficiency, more awakenings, and higher SOL remained significantly associated with blunted weight loss after adjustment for covariates (p < 0.05). Later waketime, longer time in bed, longer sleep duration, higher WASO, more awakenings, and higher SOL were associated with lower odds of achieving ≥300 min/wk of moderate-to-vigorous physical activity, adjusted for covariates (FDR p < 0.05).ConclusionsFuture studies should evaluate whether incorporating strategies to improve sleep health within a behavioral weight loss intervention leads to improved adherence to diet and physical activity recommendations and enhanced weight loss.Clinical trials identifierNCT01985568.

Project description:BACKGROUND:Reductions in physical activity (PA) are common throughout young adulthood and low PA is associated with weight gain. The SNAP Trial previously reported that two self-regulation approaches to weight gain prevention reduced weight gain over a 2-year period in 18-35 year olds. Presented here are secondary analyses examining changes in PA and the relationship between PA and weight change over 2 years. METHODS:599 young adults (age: 27.4?±?4.4 yrs.; BMI: 25.4?±?2.6 kg/m2) were randomly assigned to 1 of 3 treatment arms: Small Changes (reduce calorie intake by 100 kcals/day & add 2000 steps/day), Large Changes (lose 2.3-4.5 kg initially & increase PA to ?250 min/wk), or Self-guided (control condition). Small and Large Changes received 10, face-to-face group sessions (months 1-4), and two 4-week refresher courses each subsequent year. Body weight and PA were objectively-measured at baseline, 4 months, 1 and 2 years. Daily steps and bout-related moderate-to-vigorous intensity PA (MVPA: ?3 METs, ?10-min bouts) was calculated. RESULTS:Changes in bout-related MVPA and daily steps did not differ among treatment groups over the 2-year period (p's?>?0.16). Collapsed across groups, participants gaining >1 lb. (n?=?187; 39.6%) had smaller changes in bout-related MVPA at 4 months, 1 and 2 years relative to those maintaining or losing weight (?1 lb. weight gain; n?=?282, 60.4%, p's?<?0.05). Averaged across time points, this difference equated to 47.8 min/week. Those gaining and not gaining >1 lb. did not differ on daily steps (p's?>?0.10). Among participants engaging in ?250 min/wk. of MVPA at 2 years (n?=?181), 30% gained >1 lb. from baseline to 2 years, which was not different from those engaging in 150-250 min/wk. (n?=?87; 36%; p?=?0.40), but this percentage was significantly lower when compared to those engaging in <150 min/wk. (n?=?176; 49%; p?<?0.001). CONCLUSIONS:On average, PA differences were not observed between young adults assigned to small or large changes self-regulation interventions to prevent weight gain. Regardless of group assignment, higher levels of MVPA were associated with better weight gain prevention over 2 years. Our data suggest that achieving >150 min/week of MVPA is needed for weight gain prevention and that increasing MVPA, rather than steps, should be targeted. TRIAL REGISTRATION:www.clinicaltrials.gov (NCT01183689). Registered Aug 13, 2010.

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The effect of physical activity on 18-month weight change in overweight adults.

Publications

The effect of physical activity on 18-month weight change in overweight adults.

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