Table 4

Associations between vigorous physical activity variables at the first examination and lung function and decline*

Vigorous physical activity levelsNFEV1 (mL)FVC (mL)
Mean difference95% CINMean difference95% CI
Association with lung function†
Frequency
 ≤1 a month3887Reference3872Reference
 1–3 times a week13.2−20.3 to 46.616.9−21.2 to 55.1
 ≥4 times a week12.3−35.9 to 60.459.34.4 to 114.3
Duration (per week)
 ≤30 min3857Reference3842Reference
 1–3 hours20.8−13.2 to 54.813.5−25.3 to 52.3
 ≥4 hours39.3−5.9 to 84.673.922.4 to 125.4
Active
 ≥2 times and ≥1 hour per week385543.612.0 to 75.1384053.917.8 to 89.9
Association with rate of lung function decline‡
Frequency
 ≤1 a month3887Reference3872Reference
 1–3 times a week1.6−0.3 to 3.40.1−2.2 to 2.5
 ≥4 times a week−0.3−2.9 to 2.4−1.5−4.9 to 2.0
Duration   (per week)
 ≤30 min3857Reference3842Reference
 1–3 hours2.30.4 to 4.11.7−0.7 to 4.1
 ≥4 hours1.4−1.1 to 3.91.9−1.4 to 5.1
Active
 ≥2 times and ≥1 hour per week38551.4−0.3 to 3.23840−0.3−2.6 to 2.0
  • Bold indicates P value <0.05.

  • *Adjusted for sex, age, age-squared, height, weight, smoking status, second-hand smoke exposure, education and occupation. An interaction term between time between follow-ups and the physical activity parameter was included to capture the effect of physical activity on lung function decline.

  • †A positive estimate suggests that those more active at the first examination had higher average lung function at both examinations than those less active.

  • ‡A positive estimate suggests that those more active at the first examination had a smaller decline in lung function between the two examinations than those less active.

  • N, number of participants included in the model.