Longitudinal changes in body composition and waist circumference by self-reported levels of physical activity in leisure among adolescents: the Tromsø study, Fit Futures

Aars, Nils Abel; Jacobsen, Bjarne K.; Morseth, Bente; Emaus, Nina; Grimsgaard, Sameline

doi:10.1186/s13102-019-0150-8

BMC Sports Science, Medicine and Rehabilitation

Table 2 Difference in BMI (kg/m²), waist circumference, FMI (fat mass in kg/m²) and LMI (lean mass in kg/m²) between Fit Futures 1 (2010–2011) and Fit Futures 2 (2012–2013), according to hours per week of physical activity in leisure time at baseline^a

From: Longitudinal changes in body composition and waist circumference by self-reported levels of physical activity in leisure among adolescents: the Tromsø study, Fit Futures

		Beta for ∆BMI (95% CI)				Beta for ∆waist circumference (95% CI)				Beta for ∆FMI (95% CI)				Beta for ∆LMI (95% CI)
Boys	n	Model 1		Model 2		Model 1		Model 2		Model 1		Model 2		Model 1		Model 2
Baseline physical activity	290	Beta	95% CI	Beta	95% CI	Beta	95% CI	Beta	95% CI	Beta	95% CI	Beta	95% CI	Beta	95% CI	Beta	95% CI
Inactive^b	89	0		0		0		0		0		0		0		0
About 0.5–1.5 h	26	0.30	− 0.54, 1.13	0.18	− 0.65, 1.01	0.61	−2.25, 3.47	0.49	−2.38, 3.35	0.04	− 0.74, 0.82	− 0.02	− 0.80, 0.76	0.30	− 0.05, 0.65	0.26	− 0.09, 0.61
About 2 to 3 h	48	0.12	− 0.56, 0.80	0.12	− 0.55, 0.80	− 0.11	− 2.43, 2.21	−0.11	− 2.44, 2.23	0.01	− 0.62, 0.64	0.01	− 0.63, 0.64	0.07	− 0.21, 0.35	0.09	− 0.20, 0.37
About 4 to 6 h	68	0.10	− 0.50, 0.71	− 0.09	− 0.70, 0.53	− 0.67	− 2.74, 1.40	− 0.84	− 2.96, 1.27	0.07	− 0.49, 0.64	− 0.06	− 0.64, 0.52	0.01	− 0.25, 0.27	− 0.05	− 0.31, 0.22
≥ 7 h	59	− 0.07	− 0.70, 0.57	− 0.48	− 1.24, 0.29	− 0.98	−3.16, 1.19	− 2.54	− 5.19, 0.12	−0.30	− 0.91, 0.30	− 0.52	− 1.25, 0.21	0.20	− 0.08, 0.48	0.05	− 0.28, 0.38
P for linear trend		0.77		0.20		0.25		0.05*		0.41		0.22		0.41		0.75
Girls
Baseline physical activity	351
Inactive^c	95	0		0		0		0		0		0		0		0
About 0.5–1.5 h	30	0.26	− 0.50, 1.01	0.40	− 0.37, 1.17	0.91	−2.07, 3.89	1.29	−1.76, 4.34	0.38	− 0.31, 1.06	0.56	− 0.13, 1.25	0.03	− 0.25, 0.30	− 0.01	− 0.29, 0.27
About 2 to 3 h	80	0.03	− 0.52, 0.57	0.09	− 0.47, 0.64	0.01	− 2.15, 2.17	0.14	− 2.06, 2.33	0.14	− 0.36, 0.63	0.21	− 0.28, 0.71	− 0.02	− 0.22, 0.18	− 0.03	− 0.23, 0.17
About 4 to 6 h	95	− 0.40	− 0.93, 0.12	− 0.25	− 0.82, 0.32	− 0.10	− 2.17, 1.97	0.23	−2.02, 2.49	− 0.30	− 0.78, 0.17	− 0.12	− 0.63, 0.39	− 0.05	− 0.24, 0.15	− 0.08	− 0.29, 0.13
≥ 7 h	51	0.51	− 0.12, 1.14	0.74	0.04, 1.44*	2.16	− 0.33, 4.64	2.80	0.02, 5.57*	0.60	0.03, 1.18*	0.90	0.27, 1.53*	0.01	− 0.22, 0.24	− 0.04	− 0.30, 0.22
P for linear trend		0.69		0.34		0.23		0.15		0.48		0.14		0.88		0.60

*Significantly different from the reference (p < 0.05)
^aModel 1 adjusted for baseline measurement of outcome. Model 2 adjusted for baseline measurement of outcome, screen time on weekdays, regularity of eating breakfast, age in half years at baseline and days between measurements
^bInactive boys had a mean increase of 1.1 BMI units, 3.2 cm waist circumference, 0.6 FMI units and 0.3 LMI units
^cInactive girls had a mean increase of 0.8 BMI units, 0.6 cm waist circumference, 0.5 FMI units and 0.1 LMI units

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ISSN: 2052-1847

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