Abstract
Cancer related fatigue is a chronic disease that may persist up to 10 years after successful cancer treatment and is one of the most prevalent problems in cancer survivors. Cancer related fatigue is a complex symptom that is not yet explained completely and there are only a few remedies with proven evidence. Patients do not necessarily follow a treatment plan with regular follow ups. As a consequence, physicians lack of knowledge how their patients are coping with their fatigue in daily life. To overcome this knowledge gap, we developed a smartphone-based monitoring system. A developed Android app provides activity data from smartphone sensors and applies experience based sampling to collect the patients’ subjective perceptions of their fatigue and interference of fatigue with the patients’ daily life. To evaluate the monitoring system in an observational study, we recruited seven patients suffering from cancer related fatigue and tracked them over two to three weeks. We collected around 2700 h of activity data and over 500 completed questionnaires. We analysed the average completion of answering the digital questionnaires and the wearing time of the smartphone. A within-subject analysis of the perceived fatigue, its interference and measured physical activity yielded in patient specific fatigue and activity patterns depending on the time of day. Physical activity level correlated stronger with the interference of fatigue than with the fatigue itself and the variance of the acceleration correlates stronger than absolute activity values. With this work, we provide a monitoring system used for cancer related fatigue. We show with an observational study that the monitoring system is accepted by our study cohort and that it provides additional details about the perceived fatigue and physical activity to a weekly paper-based questionnaire.
Highlights
Some cancer survivors are confronted with additional hurdles even after having defeated their cancer
Physical activity level correlated stronger with the interference of fatigue than with the fatigue itself and the variance of the acceleration correlates stronger than absolute activity values
We show with an observational study that the monitoring system is accepted by our study cohort and that it provides additional details about the perceived fatigue and physical activity to a weekly paper-based questionnaire
Summary
Some cancer survivors are confronted with additional hurdles even after having defeated their cancer. One of the most prevalent problems is cancer related fatigue (CRF): almost all cancer patients suffer from CRF during treatment [1] and about 25% of cancer survivors suffer from CRF after successful treatment for up to 10 years [2]: the exhausting treatment and stressful situation of the severe disease are finished, yet CRF patients still feel constantly exhausted on a physical, mental and psychological level. A moderate to severe CRF reduces physical and mental capabilities This can lead to inability to work, impairment of social life, daily activities and hobbies, and can negatively impact relationships. Overall, this negative interference with daily life reduces quality of life [3,4].
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