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Abstract:To investigate the longitudinal association between fatigue and physical activity in Parkinson's disease (PD) and determine whether this association is distorted by potential confounders. The researchers used a single blind randomized clinical trial with cross-over design. The Multidimensional Fatigue Inventory (MFI) was used to assess fatigue and an activity monitor to measure amount of physical activity (defined as % dynamic activity during each monitoring session). Time-independent and time-dependent factors were investigated for their possible univariate association with dynamic activity. Random coefficient analysis was applied. Candidate confounders were successively added to the longitudinal association model to determine if the association between dynamic activity and fatigue was distorted. A proportional change beyond 15% was considered to be significant. Fatigue was significantly associated with physical activity (beta = -0.099, SE = 0.032, P = 0.002). This association was not significantly distorted by type of intervention, age, gender, social support, disease duration, disease severity, motor impairment, cognition, anxiety, or medication intake. Depression caused proportional change of 22.2% in the regression coefficient of the Multidimensional Fatigue Inventory. After controlling for depression, a significant association between the Multidimensional Fatigue Inventory and dynamic activity remained (beta = -0.121, SE = 0.036, P = 0.000). The association found between fatigue and dynamic activity suggests that patients who experience higher levels of fatigue are less physically active. However, the total explained variance of dynamic activity by fatigue alone was small, suggesting that fatigue is only a minor factor in the complex of behavioural aspects that affect the amount of physical activity in patients with Parkinsons Disease.
Author(s):R Elbers and Erwin Van Wegen
Date Published:2009
Locality:North of Tyne
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Is impact of fatigue an independent factor associated with physical activity in patients with idiopathic Parkinson's disease?
Abstract:To investigate the longitudinal association between fatigue and physical activity in Parkinson's disease (PD) and determine whether this association is distorted by potential confounders. The researchers used a single blind randomized clinical trial with cross-over design. The Multidimensional Fatigue Inventory (MFI) was used to assess fatigue and an activity monitor to measure amount of physical activity (defined as % dynamic activity during each monitoring session). Time-independent and time-dependent factors were investigated for their possible univariate association with dynamic activity. Random coefficient analysis was applied. Candidate confounders were successively added to the longitudinal association model to determine if the association between dynamic activity and fatigue was distorted. A proportional change beyond 15% was considered to be significant. Fatigue was significantly associated with physical activity (beta = -0.099, SE = 0.032, P = 0.002). This association was not significantly distorted by type of intervention, age, gender, social support, disease duration, disease severity, motor impairment, cognition, anxiety, or medication intake. Depression caused proportional change of 22.2% in the regression coefficient of the Multidimensional Fatigue Inventory. After controlling for depression, a significant association between the Multidimensional Fatigue Inventory and dynamic activity remained (beta = -0.121, SE = 0.036, P = 0.000). The association found between fatigue and dynamic activity suggests that patients who experience higher levels of fatigue are less physically active. However, the total explained variance of dynamic activity by fatigue alone was small, suggesting that fatigue is only a minor factor in the complex of behavioural aspects that affect the amount of physical activity in patients with Parkinsons Disease.
Author(s):R Elbers and Erwin Van Wegen
Date Published:2009
Locality:North of Tyne
Comments(1):
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Contact:Anna Jones
Job Title:
School of Health, Community and Education Studies
Coach Lane
Benton
Newcastle upon Tyne
NE7 7XA
Job Title:
Email:anna.jones@northumbria.ac.uk
Tel:0191 215 6722
Address:School of Health, Community and Education Studies
Coach Lane
Benton
Newcastle upon Tyne
NE7 7XA
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By: Dayanara Posted On: 10 January 2012 10:39 PM