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As the majority of patients (n=166) were recruited in the first year, we compared the baseline characteristics of recruited patients to the overall eligible clinic population in the major recruitment centre (the Hospital for Sick Children). Patients participating in the study were younger (11.8±dos.9 years versus 13.4±3.3 years, p<0.0005) and had higher lung function (FEV1 85.6±17.4% pred versus 67.2±23.0% pred, p<0.0001) than patients not participating in the study (n=67). There was no significant difference in baseline FEV1 (p=0.5048) or V?O2max (p=0.7126) between patients from the two paediatric centres (data not shown).
1, mucoid P. aeruginosa and CFRD, overall FEV1 decreased at a mean± sd rate of 1.63±0.08% per year (p<0.0001) and HPA increased at a mean± sd rate of 0.28±0.03 h·day ?1 per year (p<0.0001) over the study period. There was a significant positive correlation between rates of change of activity level and change in FEV1 decline, indicating that an increase in activity was associated with a slower rate of decline in lung function over the study period (r=0.19, p<0.007).
Participants were divided into high (above the mean rate of change of activity) and low (below the mean rate of change of activity) groups. table 3 indicates that all evaluated potential confounder variables were evenly distributed between the two groups. The high group had a rate of increase in HPA of 0.59 h·day ?1 per year, while the low group had a rate of decline of activity of 0.15 h·day ?1 per year over the study period. Mixed model analysis results are presented in table 4 and indicate that FEV1 was significantly associated with baseline FEV1 (p=0.0001), CFRD (p=0.0452) and change in activity level over time, such that the rate of decline of FEV1 was less steep for the high group (-1.39% pred per year) compared to the low group (-1.90% pred per year) (p=0.0001).
189 patients performed Stage I exercise testing, with a total of 493 tests included for analysis (range 1–7 tests per patient). Adjusting for baseline FEV1, there was a positive relationship between FEV1 (% pred) and V?O2height (p=0.0194) over the study period. Similarly, adjusting for baseline FEV1, there was a positive relationship between FEV1 (% pred) and WRpeak (% pred) (p=0.0004) over the study period. There was no significant association between V?O2peak and HPA (p=0.7457).
In this potential longitudinal studies, immediately following accounting having standard properties recognized to connect with health-related movement, clients with CF having expanding passion levels got a reduced price off decline of its FEV
To confirm whether an increase in HPA was associated with a slower decline in FEV1, we performed the following additional analysis. Between T1 (baseline) and T2 (2.5 years) we classified the patients into either increasing or reducing HPA over time. We then used the data between T2 and T3 (6.6 yrs) to look at the rate of FEV1 decline for the two groups. The results showed that the rate of decline in FEV1 between T2 and T3 was significantly less steep for patients who incresed their HPA (-0.58% pred per year) compared to those with reduced HPA (-2.15% pred per year) (p=0.0231). Using the same method, we found no differences in change of V?O2peak between the two groups (p=0.7590).
Defining pulmonary exacerbation as hospitalisation for respiratory symptoms requiring antibiotics , 57 (32.2%) of our study patients had at least one exacerbation with a median (range) of three (1–16) over the study period. Hospital admissions were infrequent and there was no significant association between escort McAllen V?O2peak and hospital admissions per year (r= -0.07, p=0.35).
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1 compared to those that did not become more active over the study period. If the goal in the treatment of CF is to preserve lung function for as long as possible thus potentially extending survival , these results would suggest that enhancing physical activity should be an integral part of the management of the disease.
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