Longitudinal study: mean change in cardiorespiratory function differences by physical activity change categories (the Aerobics Center Longitudinal Study, 1971–1995)
| (A) Least square means | ||||||||
|---|---|---|---|---|---|---|---|---|
| Men | Women | |||||||
| Activity habit change | MTT (min) | FEV1 (litres) | FVC (litres) | FEV1/FVC (%) | MTT (min) | FEV1 (litres) | FVC (litres) | FEV1/FVC (%) |
| A/A | 1.51 | 0.05 | 0.07 | −0.25 | 1.02 | 0.04 | 0.04 | 0.01 |
| A/S | 0.74 | −0.03 | 0.02 | −0.50 | 0.31 | 0.01 | 0.00 | 0.45 |
| S/A | 1.82 | −0.03 | 0.02 | −0.21 | 1.28 | −0.04 | −0.01 | −0.83 |
| S/S | 0.25 | −0.04 | 0.01 | −0.12 | 0.10 | −0.03 | −0.02 | −0.34 |
| (B) Multiple Comparisons | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Bonferroni adjusted p values for men | Bonferroni adjusted p values for women | ||||||||
| Group A | Group B | MTT (min) | FEV1 (litres) | FVC (litres) | FEV1/FVC (%) | MTT (min) | FEV1 (litres) | FVC (litres) | FEV1/FVC (%) |
| Controlled for smoking and drinking habit change; age, baseline BMI (for MTT), baseline height (for FEV1, FVC, and FEV1/FVC%), cardiorespiratory value at baseline; and follow up time. | |||||||||
| MTT, maximal treadmill test; FEV1, forced expiratory volume in the first second; FVC, forced vital capacity; A/A, active at the first visit and active at the second visit; A/S, active at the first and sedentary at the second; S/A, sedentary at the first visit and active at the second; and S/S, sedentary at both visits; ns, not significant. | |||||||||
| A/A | A/S | 0.001 | 0.011 | 0.027 | ns | ns | ns | ns | ns |
| A/A | S/A | 0.007 | 0.001 | 0.001 | ns | ns | ns | ns | ns |
| A/A | S/S | 0.001 | 0.001 | 0.001 | ns | 0.001 | ns | ns | ns |
| A/S | S/A | 0.001 | ns | ns | ns | 0.007 | ns | ns | ns |
| A/S | S/S | 0.001 | ns | ns | ns | ns | ns | ns | ns |
| S/A | S/S | 0.001 | ns | ns | ns | 0.001 | ns | ns | ns |