Effects of Fatigue on Physical Activity in Osteoarthritis
A 2012 study showed fatigue was a factor in reduced levels of physical activity in people with symptomatic knee and hip osteoarthritis. The coping strategies of guarding, resting, task persistence, and pacing were shown to moderate the effects of fatigue. Guarding includes bracing, limping, and stiffening. Pacing refers to breaking up activity time by alternating activity and rest periods. People who used pacing often did it because they were having symptoms rather than planning to pace their activities. Task persistence means that a person continued with the activity despite feeling symptoms.
A small study of older adults with osteoarthritis found that a bout of standardized physical activity produced increased fatigue on the day of the activity and that participants reduced their overall activity for the rest of the day (as measured by a fitness monitor device). Interestingly, however, their fatigue was lowered during the three days after the task and their activity levels returned to normal, as measured by the fitness device.
Another small study of older adults found that those with osteoarthritis were four times more likely to have more fatigue than people without the condition after a period of high-level physical activity.
Study of Fatigue in Osteoarthritis
A study published in 2008 explored how osteoarthritis patients with symptomatic knee osteoarthritis or hip osteoarthritis experienced fatigue. The researchers found the subjects had notable amounts of fatigue, which substantially impacted their lives.
Fatigue was described by study participants as exhaustion, being tired, and coming up against a brick wall. Participants generally viewed fatigue as different from sleepiness, and they drew a distinction between physical and mental fatigue. Their mean fatigue score was 30.9 on a scale of 52.
When asked what factors increase fatigue, participants replied:
Osteoarthritis painPain medicationsAgingWeatherPoor sleep
The study participants said mental health affected whether they felt fatigued and that their mood was, in turn, affected by fatigue. Participants also said fatigue impacted their physical functioning, including their ability to participate in social activities and other usual daily activities (such as household chores). As a response to the fatigue-related problems, study participants said they rest, exercise, avoid activities, or get assistance with activities. Interestingly, study participants revealed that they did not discuss their fatigue with anyone other than their spouse.
The researchers recommended further research to explore the role of fatigue in osteoarthritis and to develop strategies that would minimize the impact of fatigue on daily living for osteoarthritis patients. Overall, it’s clear that osteoarthritis is not exempt from the effects of fatigue.
