Table 4

Association of substituting 30 min of sedentary behaviour for LPA, MVPA or sleep time with measures of WC, BMI, BP, pulse, glucose, triglycerides, HDL, LDL and total cholesterol using isotemporal substitution on workdays in a sample of lorry drivers from East Midlands, UK

Sedentary to standingp valueSedentary to
light stepping
workdays
p ValueSedentary to moderate or vigorous stepping on workdaysp ValueSedentary to
sleep on
Workdays
p Value
Waist Circumference−0.1 (−1.4, 1.2)0.870−0.6 (−3.9,  2.7)0.707−6.5 (−11.0, –1.9)<0.0100.1 (−0.3,  0.5)0.500
BMI0.07 (−0.4, 0.6)0.775−0.7 (−1.9,  0.5)0.247−1.5 (−3.2, 0.2)0.089−0.0 (−0.2, 0.1)0.970
Systolic BP0.6 (−0.6, 1.9)0.338−1.9 (−5.1, 1.3)0.232−1.1 (−5.5, 3.3)0.616−0.3 (−0.4, 0.4)0.885
Diastolic BP0.6 (−0.5, 1.7)0.313−1.8 (−4.7, 0.9)0.2010.1 (−3.8, 4.0)0.952−0.2 (−0.5, 0.2)0.280
Fasting glucose−0.01 (−0.1, 0.1)0.859−0.04 (−0.3, 0.2)0.774−0.3 (−0.6, 0.1)0.144−0.04 (−0.1, 0.02)0.137
Triglycerides0.00 (−0.1, 0.1)0.9400.06 (−0.2, 0.3)0.687−0.4 (−0.8, 0.01)0.0510.02 (−0.01, 0.05)0.286
HDL cholesterol−0.02 (−0.06, 0.01)0.247−0.1 (−0.2, –0.01)0.0350.3 (0.1, 0.4)<0.010−0.01 (−0.02, 0.01)0.314
LDL cholesterol−0.04 (−0.2, 0.1)0.5590.2 (−0.1, 0.6)0.209−0.1 (−0.6, 0.5)0.748−0.02 (−0.07, 0.02)0.281
Total cholesterol−0.6 (−0.07, 0.02)0.2590.1 (−0.2, 0.5)0.5090.05 (−0.4, 0.6)0.832−0.2 (−0.07, 0.02)0.259
  • Coefficients represent the factor by which the cardiovascular markers are multiplied by (95% CI) for a 30 min difference in the substituted physical activity behaviour.

  • BMI, body mass index; BP, blood pressure; HDL, high-density lipoprotein; LDL, low-density lipoprotein; LPA, light physical activity; MVPA, moderate-to-vigorous physical activity; WC, waist circumference.