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Table 3 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 change in activity status between the surveysa

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

Boys

n

Beta for ∆BMI (95% CI)

Beta for ∆waist circumference (95% CI)

Beta for ∆FMI (95% CI)

Beta for ∆LMI (95% CI)

Change in activity status

278

Model 1

Model 2

Model 1

Model 2

Model 1

Model 2

Model 1

Model 2

 Consistently inactiveb

76

0

0

0

0

0

0

0

0

 Quitters

50

0.15 (− 0.53, 0.82)

0.06 (− 0.61, 0.73)

− 0.11 (−2.44, 2.21)

−0.29 (− 2.63, 2.04)

0.08 (− 0.54, 0.70)

0.02 (− 0.61, 0.64)

0.02 (− 0.27, 0.30)

− 0.01 (− 0.29, 0.28)

 Adopters

33

− 0.54 (− 1.32, 0.24)

− 0.72 (− 1.49, 0.06)

− 2.00 (− 4.67, 0.66)

−2.39 (− 5.08, 0.30)

− 0.93 (− 1.64, − 0.22)*

− 1.04 (− 1.76, − 0.32)*

0.33 (− 0.00, 0.66)

0.29 (− 0.04, 0.62)

 Consistently active

119

− 0.17 (− 0.71, 0.38)

− 0.47 (− 1.07, 0.13)

− 1.46 (− 3.33, 0.41)

− 2.32 (− 4.40, − 0.24)*

− 0.42 (− 0.92, 0.09)

− 0.62 (− 1.17, − 0.06)*

0.22 (− 0.03, 0.46)

0.13 (− 0.13, 0.40)

 ANOVA F-test

 

0.40

0.13

0.26

0.08

0.03

< 0.01

0.11

0.29

Girls

Change in activity status

348

        

 Consistently inactivec

86

0

0

0

0

0

0

0

0

 Quitters

80

0.14 (− 0.43, 0.70)

0.14 (− 0.43, 0.72)

0.48 (−1.75, 2.70)

0.39 (− 1.88, 2.65)

0.30 (− 0.21, 0.81)

0.31 (− 0.21, 0.82)

− 0.10 (− 0.30, 0.11)

− 0.09 (− 0.30, 0.12)

 Adopters

39

0.05 (− 0.66, 0.75)

0.05 (− 0.66, 0.77)

− 0.36 (− 3.14, 2.41)

− 0.52 (− 3.33, 2.30)

− 0.09 (− 0.73, 0.54)

− 0.09 (− 0.73, 0.55)

0.23 (− 0.02, 0.47)

0.23 (− 0.02, 0.49)

 Consistently active

143

− 0.22 (− 0.72, 0.28)

− 0.14 (− 0.69, 0.41)

− 0.04 (− 2.01, 1.92)

− 0.02 (− 2.19, 2.16)

− 0.30 (− 0.75, 0.15)

− 0.22 (− 0.72, 0.27)

0.13 (− 0.05, 0.31)

0.13 (− 0.06, 0.33)

 ANOVA F-test

 

0.54

0.76

0.94

0.94

0.09

0.19

0.02

0.04

  1. *Significantly different from the reference (p < 0.05)
  2. aChange in outcome in categories of activity status relative to consistently inactive as reference, and with an F-test for difference between groups. Model 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
  3. bConsistently inactive boys had a mean increase of 1.3 BMI units, 3.9 cm waist circumference, 0.9 FMI units and 0.3 LMI units
  4. cConsistently inactive girls had a mean increase of 0.8 BMI units, 0.9 cm waist circumference, 0.6 FMI units and 0.1 LMI units
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BMC Sports Science, Medicine and Rehabilitation

ISSN: 2052-1847

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