Muscle fiber-type distribution predicts weight gain and unfavorable left ventricular geometry: a 19 year follow-up study

Table 4 Percentage of slow-switch type-I muscle fibers as a predictor of cardiac risk factors at baseline and at follow-up

Dependent variable	Regression coefficient B (95% confidence interval)	P-value	R square
Baseline 1984
Body mass index (kg/m²)	-0.085 (-0.144 to -0.027)	0.005	0.19
Weight gain (kg/m²/year)	-0.005 (-0.007 to -0.002)	0.001	0.27
Physical activity (MET)	1.098 (0.588 to 1.607)	<0.001	0.52
Follow-up 2003
Body mass index (kg/m²)	-0.134 (-0.218 to -0.051)	0.002	0.23
Weight gain (kg/m²/year)	-0.003 (-0.005 to -0.001)	0.001	0.29
Waist/hip ratio	-0.002 (-0.003 to -0.001)	0.001	0.30
Body fat (%)	-0.223 (-0.316 to -0.130)	<0.001	0.45
Physical activity (MET)	0.823 (0.409 to 1.238)	<0.001	0.31
Systolic blood pressure (mmHg)	-0.460 (-0.858 to -0.061)	0.025	0.23
Diastolic blood pressure (mmHg)	-0.261 (-0.419 to -0.103)	0.002	0.24
Heart rate (beats/min)	-0.322 (-0.542 to -0.102)	0.005	0.20

Results are adjusted for age. Age was a significant predictor of physical activity in 1984 (B = 1.937, 95%CI 0.693 to 3.182, P = 0.003), and systolic blood pressure at follow-up (B = 1.397, 95%CI 0.424 to 2.370, P = 0.006)
Weight gain was calculated as mean yearly change in body mass index after the age of 20.

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