Volume 15, Issue 6 e12620
ORIGINAL RESEARCH

Sex as a moderator of body composition following a randomized controlled lifestyle intervention among Latino youth with obesity

Kiley B. Vander Wyst

Kiley B. Vander Wyst

Center for Health Promotion and Disease Prevention, Arizona State University, Phoenix, Arizona

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Micah L. Olson

Micah L. Olson

Center for Health Promotion and Disease Prevention, Arizona State University, Phoenix, Arizona

Division of Pediatric Endocrinology and Diabetes, Phoenix Children's Hospital, Phoenix, Arizona

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Colleen S. Keller

Colleen S. Keller

Center for Health Promotion and Disease Prevention, Arizona State University, Phoenix, Arizona

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Erica G. Soltero

Erica G. Soltero

Center for Health Promotion and Disease Prevention, Arizona State University, Phoenix, Arizona

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Allison N. Williams

Allison N. Williams

Center for Health Promotion and Disease Prevention, Arizona State University, Phoenix, Arizona

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Armando Peña

Armando Peña

Center for Health Promotion and Disease Prevention, Arizona State University, Phoenix, Arizona

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Stephanie L. Ayers

Stephanie L. Ayers

Southwest Interdisciplinary Research Center, Arizona State University, Phoenix, Arizona

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Justin Jager

Justin Jager

T. Denny Sanford School of Social and Family Dynamics, Arizona State University, Phoenix, Arizona

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Gabriel Q. Shaibi

Corresponding Author

Gabriel Q. Shaibi

Center for Health Promotion and Disease Prevention, Arizona State University, Phoenix, Arizona

Division of Pediatric Endocrinology and Diabetes, Phoenix Children's Hospital, Phoenix, Arizona

Southwest Interdisciplinary Research Center, Arizona State University, Phoenix, Arizona

Correspondence

Gabriel Q. Shaibi, Center for Health Promotion and Disease Prevention, Edson College of Nursing and Health Innovation, Arizona State University, 500 N. 3rd St, Phoenix, AZ 85004.

Email: [email protected]

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First published: 18 February 2020
Citations: 6

Funding information: National Institute of Diabetes and Digestive and Kidney Diseases, Grant/Award Number: R01 DK10757901; National Institute on Minority Health and Health Disparities, Grant/Award Numbers: P20MD002316, U54MD002316

Summary

Background

Body composition differences between males and females emerge during adolescence and continue throughout adulthood; however, whether sex moderates body composition changes in adolescents with obesity after an intervention is unknown.

Objective

To examine sex as a moderator of changes in adiposity following lifestyle intervention.

Methods

A total of 136 Latino youth with obesity (BMI% 98.2 ± 1.3) aged 14 to 16 years old were randomized to either a 12-week lifestyle intervention (27 males/40 females) or control (35 males/34 females) group. The intervention included nutrition education (1 h/wk) and moderate-to-vigorous physical activity (3 h/wk). Anthropometric data (body mass index [BMI], BMI%, waist circumference, total body fat, and fat-free mass) were obtained pre- and post-intervention. Sex differences were examined by general linear models with significance determined at P < .05 for the F-statistic.

Results

Sex did not moderate changes in BMI (F1,115 = 0.01, P = .9), BMI% (F1,115 = 0.14, P = .7), or waist circumference (F1,117 = 1.1, P = .3). Sex significantly moderated changes in body fat percent (F1,117 = 5.3, P = .02), fat mass (F1,116 = 4.5, P = .04), and fat-free mass (F1,116 = 4.3, P = .04). Intervention males compared with females had greater relative reductions in fat percent (−4.1 ± 0.8% vs −1.2 ± 0.7%, P = .02) and fat mass (−5.0 ± 1.1 kg vs −1.5 ± 0.9 kg, P = .02) and gained more fat free mass (3.6 ± 0.9 kg vs 0.5 ± 0.8 kg, P = .02) when compared with same sex controls.

Conclusion

Males and females exhibited a differential response to lifestyle intervention for percent fat, fat mass, and fat-free mass indicating that sex-specific improvements in body composition favours males over females.

CONFLICT OF INTEREST

The authors have no conflicts of interest relevant to this article to disclose.

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