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Physical Activity and Abdominal Fat Distribution in Greenland.

Accepted version
Peer-reviewed

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Authors

Dahl-Petersen, Inger Katrine 
Brage, Søren 
Bjerregaard, Peter 
Tolstrup, Janne Schurmann 
Jørgensen, Marit Eika 

Abstract

PURPOSE: We examined how total volume of physical activity and reallocation of time spent at various objectively measured intensities of physical activity (PA) were associated with overall and abdominal fat distribution in adult Inuit in Greenland. METHODS: Data were collected as part of a countrywide cross-sectional health survey in Greenland. A combined accelerometer and HR monitor measured total physical activity energy expenditure (PAEE) and intensities of PA (N = 1536). Visceral adipose tissue (VAT) and subcutaneous adipose tissue (SAT) were assessed by ultrasonography. Isotemporal substitution modeling was used to analyze the association between substitution of 1 h of sedentary time to light- or moderate-intensity PA and 1 h light-intensity PA to moderate- or vigorous-intensity PA in relation to body mass index (BMI), waist circumference (WC), SAT, and VAT. RESULTS: A negative linear association was found for total PAEE and BMI, WC, VAT, and SAT. Exchanging 1 h of sedentary time with light-intensity PA was associated with lower WC (-0.6 cm, P = 0.01), SAT (-0.08 cm, P < 0.001), and VAT (-0.04 cm, P = 0.359). Exchanging light-intensity PA with vigorous-intensity PA resulted in -6.1-cm lower WC (P < 0.001), -0.7-cm lower VAT (P = 0.018) and -0.7-cm lower SAT (P < 0.001). When further adjusting for BMI, the associations were attenuated; however, most of them remained significant, and the directions were mostly unchanged. All 1-, 5-, and 10-min bouts of MVPA were negatively associated with overall and abdominal fat distribution. CONCLUSION: Physical activity energy expenditure is associated with lower BMI, WC, and abdominal fat among Greenland Inuit. The importance of promoting an upward shift of the whole PA intensity distribution and to spur even short bouts of MVPA to limit excessive accumulation of SAT and VAT is highlighted.

Description

Keywords

Abdominal Fat, Adolescent, Adult, Aged, Aged, 80 and over, Body Fat Distribution, Body Mass Index, Cross-Sectional Studies, Energy Metabolism, Exercise, Female, Greenland, Humans, Intra-Abdominal Fat, Inuit, Male, Middle Aged, Subcutaneous Fat, Abdominal, Ultrasonography, Waist Circumference, Young Adult

Journal Title

Med Sci Sports Exerc

Conference Name

Journal ISSN

0195-9131
1530-0315

Volume Title

49

Publisher

Ovid Technologies (Wolters Kluwer Health)
Sponsorship
Medical Research Council (MC_UU_12015/3)
Medical Research Council (MC_U106179473)