Circadian rhythms, symptoms, physical functioning, and body mass index in breast cancer survivors

Abstract

Clinicians need to target high-risk women with phase-delayed rhythms, higher symptoms, and lower physical functioning for intervention.

Biopsychosocial Predictors of Psychological Functioning Among African American Breast Cancer Survivors

“…To our knowledge, this is the first quantitative study that investigated the outcome of anxiety in an entire sample of African American women breast cancer survivors. Our findings were similar to Berger, Hertzog, Geary, Fischer, and Farr (2012), who reported that BMI was predictive of psychological functioning among breast cancer survivors. A study by Kwan et al (2011) reported that for breast cancer survivors, the degree of obesity confers a greater risk for survival.…”

Predictors and Trajectories of Morning Fatigue Are Distinct From Evening Fatigue

“…26 One possible explanation why anxiety was associated with only morning fatigue is that increased anxiety is associated with sleep disturbance in oncology patients. 47,55,67 While morning fatigue was not evaluated in these studies, patients with higher levels of anxiety reported lower levels of morning energy 47,55 and higher levels of sleep disturbance. 67 Taken together, our findings suggest that additional research is warranted on the associations among morning fatigue, anxiety, sleep disturbance, and regular exercise.…”

Relationships of Circadian Rhythms and Physical Activity With Objective Sleep Parameters in Lung Cancer Patients

“…In contrast, 2 previous studies showed no correlation between self-rated sleep difficulties and circadian rhythms as measured by the r24 20 and I G O. 19,20 Because sleep parameters were detected by the actigraph, and the circadian rhythms of r24 and I G O were derived from a sophisticated device, we suggest that using objective instead of subjective tools to measure sleep would produce better circadian rhythm parameters. In this study, the I G O was a significant predictor of both the TST and SOL.…”

“…The r24 is a ratio to quantify the regularity and consistency of activity patterns from 1 day to the next. 20 The coefficient ranges from j1 to 1, and a higher coefficient indicates more-robust circadian rhythms. 19,34 The I G O represents the percentage of activity counts measured in 1 minute when a subject is in bed that is less than the median value when the subject is out of bed.…”

“…However, 2 other studies indicated no relationship of I G O with sleep 19 or r24 with sleep. 19,20 Possible limitations of the aforementioned studies could be using a 1-item question 17Y19 or subjective sleep questionnaire 13 that did not actually reflect sleep quality or did not objectively synchronically detect sleep parameters with an actigraph.…”