Effects of treatment factors, comorbidities and health-related quality of life on self-efficacy for physical activity in cancer survivors

The Effect of Self-efficacy-Enhancing Interventions on Quality of Life of Cancer Survivors: A Systematic Review

BACKGROUND

The influence of self-efficacy-enhancing interventions on quality of life (QOL) is not clear with recent randomized controlled trials (RCTs) because current reviews only evaluated self-efficacy as an outcome.

OBJECTIVES

We conducted a systematic review to examine the effect of self-efficacy-enhancing interventions on QOL among patients with cancer and to summarize the effective determinants for designing self-efficacy-enhancing interventions.

METHODS

A systematic search was performed on studies published from January 2003 to May 2023 using PubMed, CINAHL, PsycINFO, and Web of Science. Included studies were RCTs, adults diagnosed with cancer, interventions with explicit self-efficacy components, and QOL as the outcome.

RESULTS

Nineteen RCTs were included. Risk-of-bias assessment revealed 12 studies with some concerns and 7 with high risk of bias. The mean intervention adherence rate was 88.2%; the most frequently listed reason for dropout was medical conditions and mortality. Self-efficacy interventions were shown to significantly improve at least 1 subscale of QOL in 9 of 19 studies, of which 7 studies used Bandura's 4 sources of self-efficacy. The interventions with between-session intervals shorter than 2 weeks, of 12-week duration, and with an in-person delivery approach were the most effective.

CONCLUSIONS

Self-efficacy-enhancing interventions show potential beneficial effects on QOL among cancer survivors. Interventions that use Bandura's 4 sources of self-efficacy strategies and have between-session intervals shorter than 2 weeks, an in-person approach, and 12-week intervention duration are recommended.

IMPLICATIONS FOR PRACTICE

Properly designed self-efficacy-enhancing interventions can facilitate behavioral change and improve QOL in cancer survivors.

Predictors of persistence of post-chemotherapy symptoms among survivors of solid tumor cancers

CONTEXT

Late or residual symptoms diminish quality of life for many cancer survivors after completion of treatment.

OBJECTIVES

Examine risk factors associated with persisting symptom burden after chemotherapy and the lack of symptom improvement over time.

METHODS

Survivors who completed curative-intent chemotherapy within two years for solid tumors were enrolled into a symptom management trial. There were 375 survivors with two or more comorbid conditions or one comorbid condition and elevated depressive symptoms (pre-defined risk factors in the trial design) who received interventions and 71 survivors without these risk factors who did not receive interventions. For all survivors, symptoms were assessed at intake, 4, and 13 weeks and categorized as mild, moderate, or severe based on the interference with daily life. The probabilities of moderate or severe symptoms and symptom improvement were analyzed using generalized mixed-effects models in relation to comorbidity, depressive symptoms, age, sex, race/ethnicity, employment, time since chemotherapy completion, and physical function. Multiple symptoms were treated as nested within the survivor.

RESULTS

Moderate or severe symptoms at baseline and the lack of improvement over time were associated with younger age and lower physical function over and above a greater number of comorbidities and elevated severity of depressive symptoms.

CONCLUSION

Risk factors identified in this research (younger age, lower physical function, greater comorbidity, and higher depressive symptoms) can be used to allocate resources for post-treatment symptom management for cancer survivors in order to relieve symptoms that do not necessarily resolve with time.

Self-efficacy in managing post-treatment care among oral and oropharyngeal cancer survivors

OBJECTIVE

Physical and psychosocial effects of oral cancer result in long-term self-management needs. Little attention has been paid to survivors' self-efficacy in managing their care. Study goals were to characterise self-care self-efficacy and evaluate socio-demographics, disease, attitudinal factors and psychological correlates of self-efficacy and engagement in head and neck self-exams.

METHODS

Two hundred thirty-two oral cancer survivors completed measures of socio-demographics, self-care self-efficacy, head and neck self-exams and attitudinal and psychological measures. Descriptive statistics characterised self-efficacy. Hierarchical regressions evaluated predictors of self-efficacy.

RESULTS

Survivors felt moderately confident in the ability to manage self-care (M = 4.04, SD = 0.75). Survivors with more comorbidities (β = -0.125), less preparedness (β = 0.241), greater information (β = -0.191), greater support needs (β = -0.224) and higher depression (β = -0.291) reported significantly lower self-efficacy. Head and neck self-exam engagement (44% past month) was relatively low. Higher preparedness (OR = 2.075) and self-exam self-efficacy (OR = 2.606) were associated with more engagement in self-exams.

CONCLUSION

Many survivors report low confidence in their ability to engage in important self-care practices. Addressing unmet information and support needs, reducing depressive symptoms and providing skill training and support may boost confidence in managing self-care and optimise regular self-exams.

Use of scheduled and unscheduled health services by cancer survivors and their caregivers

PURPOSE

The purpose was to determine predictors of scheduled and unscheduled health services use by cancer survivors undergoing treatment and their informal caregivers.

METHODS

English- or Spanish-speaking adult cancer survivors undergoing chemotherapy or targeted therapy for a solid tumor cancer identified a caregiver (N = 380 dyads). Health services use over 2 months was self-reported by survivors and caregivers. Logistic regression models were used to relate the likelihood of service use (hospitalizations, emergency department [ED] or urgent care visits, primary care, specialty care) to social determinants of health (age, sex, ethnicity, level of education, availability of health insurance), and number of comorbid conditions. Co-habitation with the other member of the dyad and other member's health services use were considered as additional explanatory variables.

RESULTS

Number of comorbid conditions was predictive of the likelihood of scheduled health services use, both primary care and specialty care among caregivers, and primary care among survivors. Greater probability of specialty care use was associated with a higher level of education among survivors. Younger age and availability of health insurance were associated with greater unscheduled health services use (hospitalizations among survivors and urgent care or ED visits among caregivers). Unscheduled health services use of one member of the dyad was predictive of use by the other.

CONCLUSIONS

These findings inform efforts to optimize health care use by encouraging greater use of scheduled and less use of unscheduled health services. These educational efforts need to be directed especially at younger survivors and caregivers.

Feasibility of implementing an exercise intervention in older adults with hematologic malignancy

Older adults with Hematologic Malignancy (HM) are vulnerable to functional decline secondary to disease and treatment. Interventions for physical deconditioning, in concert with routine hematology care are limited. The feasibility of accrual, retention, and demand for an exercise intervention among a high-risk HM population was piloted.

METHODS

Older adults with HM, on active treatment, with functional impairment were recruited prospectively to participate in a 6-month Otago Exercise Programme (OEP). Measures of motivation, self-efficacy, patient identified barriers to exercise, barriers to clinical trial enrollment, study satisfaction, and serious adverse events were captured.

RESULTS

63 patients were approached, 18 declined trial enrollment, 45 consented, 30 patients enrolled in the exercise program. The main barrier for trial enrollment was transportation/travel concerns (n = 15). Of the 45 consented participants, 8 (12.7%) dropped out due to clinical deterioration, 5 (7.9%) withdrew, and 2 (3.2%) were ineligible prior to exercise-intervention intiation. The median age was 75.5 years (range 62-83) with plasma cell dyscrasia (63%), non-Hodgkin lymphoma (20%) and leukemia (17%). Retention of the physical therapist (PT) led-OEP was 76.6% of patients (n = 23/30), and end-of-study retention was 66.7% (n = 20/30). Of the evaluable patients, 23/29 completed the PE-led OEP yielding a completion rate of 79%. Participants were extremely motivated (72.4%) and strongly intended (89.7%) to engage in regular physical activity. Exercising when tired increased from a median score of 50 at Visit 1 to 70 at Visit 2, but dropped significantly to 45 at Visit 3 (p < 0.001). Participants reported significantly lower self-efficacy to exercise over the next 6 months from Visit 1 to Visit 3 (p = 0.001).

CONCLUSIONS

Older patients with HM had higher completion of in-person, PT-led exercise compared to at-home, independent exercise. Older adults were motivated and found the program acceptable, yet the ability to sustain a structured exercise program was challenging due to changes in health status. ClinicalTrials.gov Identifier: NCT02791737.

Factors related to psychological well-being amongst patients with type 2 diabetes

INTRODUCTION

The effect of diabetes on psychological well-being (PWB) is a concern for the development of medical care in diabetes management. There are few studies have simultaneously evaluated the impacts of related factors in PWB among patients with type 2 diabetes.

METHOD

This cross-sectional study was conducted on 183 male and 317 female patients with diabetes who had been registered in healthcare centers in Behbahan from November 2018 until April 2019. The patients' well-being status, medications, diet, and physical activity (PA) adherances were measured using validated questionnaires.

RESULT

The mean age of the participants was 52.18 ± 10.29 years. The total mean (SD) score of PWB was 87.40 ± 9.945. In addition, the results of univariate and multivariate analyses showed that the level of adherence to medication had a significant or close-to-significant relationship with PWB score (p < 0.001 and p = 0.082, respectively). The results of univariate and multivariate analyses  also indicated that adherence to diet was significantly associated with PWB score (p < 0.001 and p < 0.001, respectively). However, there were no significant differences among PA levels regarding the PWB score (p = 0.087). The results showed that glycemic control was significantly correlated to PWB score (p < 0.001).

CONCLUSION

Despite the wide variety of relating factors to PWB, adherence to the diet and medication could be added to diabetic guidelines to improve glycemic management and well-being.

Describing and exploring self-esteem, physical self-perceptions, physical activity and self-efficacy in adolescent and young adult cancer survivors

OBJECTIVES

(a) Describe levels of physical and global self-esteem and (b) explore the relationships between these types of self-esteem and physical activity (PA) behaviour, self-efficacy for PA and physical self-perceptions among adolescent and young adult (AYA) cancer survivors.

METHODS

A total of 87 AYA cancer survivors (M_age  = 32.90 ± 4.38 years), who were on average 2.08 ± 1.37 years post-treatment, participated in this cross-sectional observational study. Descriptive statistics, correlations and hierarchical multivariate linear regression analyses were used to analyse the data.

RESULTS

Moderate levels of physical and global self-esteem were reported. Both types of self-esteem were significantly related to physical self-perceptions, but not to PA behaviour nor self-efficacy for PA. Self-efficacy for PA moderated the relationship between physical self-perceptions and physical self-esteem, such that the association between physical self-perceptions and physical self-esteem was of stronger magnitude at higher levels of self-efficacy for PA than at lower levels of self-efficacy for PA.

CONCLUSION

This study provides a starting point for describing self-esteem and identifying the circumstances under which self-esteem may be optimised among AYA cancer survivors. Fostering feelings of confidence, competence and control over PA may help to promote psychological well-being among AYA cancer survivors.

Exploring Physical Self-Perceptions Among Survivors of Adolescent and Young Adult Cancer

This study explored the factor structure of four subscales from the Physical Self-Description Questionnaire-Short Form (PSDQ-S). Associations between subscales and personal and medical factors were also examined. The analytic sample consisted of 89 survivors of adolescent and young adult cancer (M_{age at time of study} = 32.96 ± 4.37 years; M_{age at diagnosis} = 31.16 ± 4.84 years; 75.3% female). Confirmatory factor analysis suggested a reasonable fit to the data, indicating that the PSDQ-S subscales examined could be used in future investigations with this population [χ²(38) = 46.9, p = 0.15; Root Mean Square Error of Approximation = 0.05, 90% confidence interval = 0-0.10; Comparative Fit Index = 0.97; Standardized Root Mean Square of the Residuals = 0.07]. Multiple linear regressions showed that personal and medical factors accounted for a significant amount of variance in the body fat subscale, with female sex and higher body mass index being significantly associated with lower positive perceptions about the amount of one's body fat. More research examining the factor structure of the PSDQ-S subscales is warranted, and future investigations exploring personal, medical, and modifiable factors associated with physical self-perceptions should be conducted.

Effects of a Mobile Educational Program for Colorectal Cancer Patients Undergoing the Enhanced Recovery After Surgery

Background:

The Enhanced Recovery After Surgery (ERAS) program hastens recovery from colorectal cancer by shortening the treatment period and enabling a return to normal activities. However, patients with colorectal cancer treated under the ERAS program have fewer opportunities to consult with medical staff and receive education regarding self-care and experience more affective stress and anxiety.

Objective:

This study aimed to develop and assess an educational program for patients with colorectal cancer treated under the ERAS program, considering affective aspects.

Method:

Patients with colorectal cancer (n = 118) who underwent open colon surgery under the ERAS program were assigned alternately in the order of admission on a 1:1 basis to a treatment group (n = 59) and conventional care group (n = 59). The treatment group received a two-week mobile-based intervention, whereas the control group received conventional care. Quality of life, self-efficacy, anxiety, and depression were compared between the two groups.

Results:

The mobile web-based educational program significantly reduced the negative impact of surgery on the quality of life in the treatment group, compared with the conventional care group, and triggered a noticeable decline in anxiety and depression and increase in self-efficacy.

Conclusion:

The developed mobile web-based educational program effectively enhanced self-efficacy, positively impacted the quality of life, and reduced anxiety and depression. The program could have a positive effect on the quality of life of patients with colorectal cancer treated under the ERAS program.

Perceived somatic and affective barriers for self-efficacy and physical activity

According to Bandura's social-cognitive theory, perceptions of somatic and affective barriers are sources of self-efficacy. This longitudinal study compares general indicators of health barriers with measures of perceived somatic and affective barriers to predict self-efficacy and accelerometer-assessed physical activity in a subsample of n = 153 (selected at random from N = 310) community-dwelling German older adults. Perceived somatic and affective barriers longitudinally predicted physical activity mediated by self-efficacy, whereas general health barriers did not. Perceived health barriers to physical activity might be more important than more objective health barriers for older adults' physical activity levels.

Feasibility and acceptability of "healthy directions" a lifestyle intervention for adults with lung cancer

OBJECTIVE

The aims of this feasibility study of an adapted lifestyle intervention for adults with lung cancer were to (1) determine rates of enrollment, attrition, and completion of 5 nurse-patient contacts; (2) examine demographic characteristics of those more likely to enroll into the program; (3) determine acceptability of the intervention; and (4) identify patient preferences for the format of supplemental educational intervention materials.

METHODS

This study used a single-arm, pretest and posttest design. Feasibility was defined as ≥20% enrollment and a completion rate of 70% for 5 nurse-patient contact sessions. Acceptability was defined as 80% of patients recommending the program to others. Data was collected through electronic data bases and phone interviews. Descriptive statistics, Fisher's exact test and Wilcoxon rank sum test were used for analyses.

RESULTS

Of 147 eligible patients, 42 (28.6%) enrolled and of these, 32 (76.2%) started the intervention and 27 (N = 27/32; 84.4%; 95% CI, 67.2%-94.7%) completed the intervention. Patients who were younger were more likely to enroll in the study (P = .04) whereas there were no significant differences by gender (P = .35). Twenty-three of the 24 (95.8%) participants' contacted posttest recommended the intervention for others. Nearly equal numbers of participants chose the website (n = 16, 50%) vs print (n = 14, 44%).

CONCLUSION

The intervention was feasible and acceptable in patients with lung cancer. Recruitment rates were higher and completion rates were similar as compared to previous home-based lifestyle interventions for patients with other types of cancer. Strategies to enhance recruitment of older adults are important for future research.

Health related quality of life improvement in breast cancer patients: secondary outcome from a simple blinded, randomised clinical trial

OBJECTIVE

To determine the effectiveness of an early physiotherapy intervention for the prevention of secondary lymphoedema on health-related quality of life in women who also received an education program after breast cancer surgery.

METHODS

One hundred and fifty three women diagnosed with unilateral breast cancer (stage I-II) treated with breast surgery, which included axillary lymph-node dissection, from Hospital Príncipe de Asturias, Alcalá de Henares, Madrid (Spain) were randomly assigned into two groups. Subjects in early physiotherapy group (n = 76) received a physiotherapy intervention combined with a therapeutic education program; women in the control group (n = 77) received only the therapeutic education program. Both interventions were delivered by two different physiotherapists of Physiotherapy in Women's Health Research Group at Physiotherapy Department of Alcala University. Health related quality of life was measured with EORTC QLQ-C30 and EORTC QLQ-BR23 questionnaires in 5 assessments: after surgery just before group interventions started (A1), after the 3-week group interventions finished (A2); and a follow-up period in 3 (A3), 6 (A4) and 12 (A5) months after surgical intervention.

RESULTS

Greater change in quality of life was observed for early physiotherapy group arm compared to control group, although no strong statistical evidence was found (p > .05) for most of the dimensions except for physical function and social function areas (p < .003).

CONCLUSIONS

The control group with therapeutic education program reported a clear improvement in the perception of quality of life. Adding early physiotherapy to the therapeutic education program did not show statistically significant changes in the global score or in most of the dimensions, but showed an improvement in the physical and social dimensions.

Chronic disease burden among cancer survivors in the California Behavioral Risk Factor Surveillance System, 2009-2010

PURPOSE

The California Behavioral Risk Factor Surveillance System estimates that 56.6 % of cancer survivors report ever being diagnosed with a chronic disease. Few studies have assessed potential variability in comorbidity by cancer type.

METHODS

We used data collected from a representative sample of adult participants in the 2009 and 2010 California Behavioral Risk Factor Surveillance System (n = 18,807). Chronic diseases were examined with cancer survivorship in case/non-case and case/case analyses. Prevalence ratios (PR) and corresponding 95 % confidence intervals (95 % CI) were estimated using Cox proportional hazards models, with adjustment on race, sex, age, education, smoking, and drinking.

RESULTS

Obesity was associated with gynecological cancers (PR 1.74; 95 % CI 1.26-2.41), and being overweight was associated with gynecological (PR 1.40; 95 % CI 1.05-1.86) and urinary (PR 2.19; 95 % CI 1.21-3.95) cancers. Arthritis was associated with infection-related (PR 1.78; 95 % CI 1.12-2.83) and hormone-related (PR 1.20; 95 % CI 1.01-1.42) cancers. Asthma was associated with infection- (PR 2.26; 95 % CI 1.49-3.43), hormone- (PR 1.46; 95 % CI 1.21-1.77), and tobacco- (PR 1.86; 95 % CI 1.25-2.77) related cancers. Chronic obstructive pulmonary disease (COPD) was associated with infection- (PR 2.16; 95 % CI 1.22-3.83) and tobacco-related (PR 2.24; 95 % CI 1.37-3.66) cancers and with gynecological cancers (PR 1.60; 95 % 1.00-2.56).

CONCLUSIONS

This is the first study to examine chronic disease burden among cancer survivors in California. Our findings suggest that the chronic disease burden varies by cancer etiology.

IMPLICATIONS FOR CANCER SURVIVORS

A clear need has emerged for future biological and epidemiological studies of the interaction between chronic disease and cancer etiology in survivors.

Affect and mindfulness as predictors of change in mood disturbance, stress symptoms, and quality of life in a community-based yoga program for cancer survivors

Little attention has been paid to the psychological determinants by which benefits are accrued via yoga practice in cancer-related clinical settings. Using a longitudinal multilevel modeling approach, associations between affect, mindfulness, and patient-reported mental health outcomes, including mood disturbance, stress symptoms, and health-related quality of life (HRQL), were examined in an existing seven-week yoga program for cancer survivors. Participants (N = 66) were assessed before and after the yoga program and at three- and six-month follow-ups. Decreases in mood disturbance and stress symptoms and improvements in HRQL were observed upon program completion. Improvements in mood disturbance and stress symptoms were maintained at the three- and six-month follow-ups. HRQL exhibited further improvement at the three-month follow-up, which was maintained at the six-month follow-up. Improvements in measures of well-being were predicted by initial positive yoga beliefs and concurrently assessed affective and mindfulness predictor variables. Previous yoga experience, affect, mindfulness, and HRQL were related to yoga practice maintenance over the course of the study.

Treatment-related and psychosocial variables in explaining physical activity in women three weeks to six months post-treatment of breast cancer

OBJECTIVE

This study examined treatment-related and psychosocial variables in explaining total and leisure time physical activity in breast cancer survivors three weeks to six months post-treatment.

METHODS

A questionnaire was used to measure total and leisure time physical activity and relevant determinants among 464 breast cancer survivors (aged 18-65 years).

RESULTS

Personal control was an important overall determinant in explaining physical activity in breast cancer survivors. The impact of treatment-related variables and psychological functioning depended on the working status of the women. Fatigue and poor body image prevented non-working women from being sufficiently physically active. In working women, chemotherapy and arm problems negatively influenced physical activity, whereas therapy side-effects (headaches, hot flashes, feeling unwell) and poor body image positively influenced physical activity. Social support and coping strategies could not explain post-treatment physical activity levels.

CONCLUSION

Personal control, treatment-related variables and psychological functioning influenced physical activity after cancer treatment. Relations depended on the working status of the women.

PRACTICE IMPLICATIONS

Incorporating self-control methods in physical activity interventions after breast cancer could be helpful. Furthermore, interventions should be tailored to the experienced symptoms (fatigue, arm-problems, body image) and working status of women.

Factors associated with self-care self-efficacy among gastric and colorectal cancer patients

BACKGROUND

Many studies have demonstrated that self-efficacy plays a crucial role in self-care. However, findings from previous studies indicate that the relationships between self-efficacy and several variables are inconsistent.

OBJECTIVE

The purpose of this study was to assess the level of self-care self-efficacy among Chinese gastric and colorectal cancer patients and to identify the demographic and disease-related, physical, psychological, and social factors associated with their self-care self-efficacy.

METHODS

One hundred forty-eight cancer patients were recruited from hospitals in Shanghai and Shandong Province. Their self-efficacy, health status, social support, and mental health were assessed during face-to-face interview, using the Strategies Used by People to Promote Health (Chinese version), Medical Outcome Study Short Form 36, Social Support Questionnaire, and the Hospital Anxiety and Depression Scale.

RESULTS

The overall level of self-care self-efficacy was moderate (mean, 80.34). The multiple regression analyses indicated that depression, physical functioning, use of available social support, vitality, and profession were indicators of the level of self-care self-efficacy and accounted for 60.9% of the variances.

CONCLUSION

Participants who had less depression, better physical function, more social support, and higher vitality tended to have higher levels of self-care self-efficacy. Depression levels had the largest influence on self-care self-efficacy.

IMPLICATIONS FOR PRACTICE

Findings indicate that nurses may be able to influence certain cancer patients' self-care self-efficacy by attending to depression and other variables related to physical and social functioning.

Quality of life and perceived educational needs among older cancer survivors

The purpose of this study was to evaluate perceived educational needs regarding nutrition and exercise in older cancer survivors. One hundred ninety survivors, age 70.7 (7.5), completed a Survey of Needs developed from the City of Hope Quality of Life model. Fifty percent reported distress related to poor appetite, 60% reported distress related to weight change, 64% reported distress related to balance/walking/mobility difficulty, and 79% reported distress related to fatigue. Weight change, poor appetite, balance/walking/mobility difficulty, and fatigue were significantly associated with distress related to (a) managing household activities, (b) caring for family, (c) maintaining a sense of well-being, (d) coping with grief and loss, and (e) managing stress. Despite distress associated with weight change, poor appetite, mobility difficulty, and fatigue, respondents did not recognize a need for education regarding nutrition and exercise. Findings suggest that evaluating older survivors' perceptions of needs may be necessary prior to designing interventions for care.

Demonstration and manifestation of self-determination and illness resistance--a qualitative study of long-term maintenance of physical activity in posttreatment cancer survivors

OBJECTIVE

The aim of this study was to describe posttreatment cancer survivors' lived experience of long-term maintenance of physical activity (PA).

METHODS

A qualitative, salutogenetic-oriented study was conducted based on four audiotaped, semistructured focus group interviews. Interviewee selection was carried out through purposeful sampling. Twenty-three cancer survivors (17 women and 6 men; median age 50 years, range 29-70) who were physically inactive prior to their diagnosis but who had been exercising regularly for a minimum of 18 months posttreatment participated in the study. The participants were recruited from The Copenhagen PACT Study that evaluated the effect of a one-year rehabilitation program (supervised exercise [weekly], expert lectures [trimonthly], in-group coaching [bimonthly] and individual coaching [3 × 1 h]). Data were analyzed by use of systematic condensation analysis inspired by Giorgi's descriptive phenomenological methodology (see Sketch of a psychological phenomenological method, in: Giorgi A (ed.), Phenomenology and Psychological Research, Duquesne University Press, Pittsburgh, 1985).

RESULTS

The analysis revealed five categories, which were summarized into an overall sentence describing the essence of long-term PA maintenance in cancer survivors: demonstration and manifestation of self-determination and illness resistance. In sum, the participants described regular PA as a prerequisite for feeling and staying well and preserving and pursuing own potentials whereby PA maintenance becomes a goal in itself.

CONCLUSIONS

This study indicates that cancer survivors' continued motivation for PA may be dependent on the fulfillment of a personal and conscious experience of being in the process of creating and living a comprehensible and meaningful life. Future theory-based interventions to encourage PA maintenance in cancer survivors could potentially benefit by integration of humanistic and existential psychology in addition to social cognitive theory and theory of planned behavior.

Fatigue, self-efficacy, physical activity, and quality of life in women with breast cancer

BACKGROUND

More than 192 000 US women faced the challenge of living with breast cancer in 2009. Although exercise may help combat treatment-related symptoms, cancer-related fatigue has been identified as a potential barrier to engaging in physical activity. Self-efficacy has been proposed to mediate the impact of cancer-related fatigue on physical activity and subsequently improve quality of life (QOL).

OBJECTIVE

The purpose of this study was to determine the linkages among the concepts of an introductory model of fatigue related to cancer, self-efficacy for physical activity, physical activity, and QOL in women being treated for breast cancer.

INTERVENTIONS/METHODS

Women currently receiving treatment for breast cancer were asked to complete 5 instruments: demographic profile, Piper Fatigue Scale, Physical Activity Assessment Inventory, Human Activity Profile, and McGill QOL Questionnaire. Structural equation modeling of the data was performed to determine the direct and indirect influences of study variables on QOL.

RESULTS

The model was tested based on responses of 73 participants. All paths between variables were significant. The model explained 53% of the variance in QOL scores, 28% of the variance in physical activity, and 31% of the variance in self-efficacy.

CONCLUSIONS

Although fatigue is most commonly thought of as a physical problem requiring physical intervention, this study provides emerging evidence to suggest there may be potential interventions to improve self-efficacy that may mediate the effect of fatigue on QOL.

IMPLICATIONS FOR PRACTICE

Interventions to improve self-efficacy may contribute to increased physical activity and improved QOL in this population.

Associations of physical activity with quality of life and functional ability in breast cancer patients during active adjuvant treatment: the Pathways Study

Physical activity can improve quality of life (QOL) in breast cancer survivors but little is known about associations of physical activity and QOL during active cancer therapy. We examine associations between activity levels and QOL in a large cohort of breast cancer patients. Women with invasive, non-metastatic breast cancer (n=2,279) were enrolled between 2006 and 2009 from a managed care organization; assessment were done during active therapy. A physical activity frequency questionnaire was used to calculate the average weekly metabolic equivalent task (MET) hours spent in moderate and vigorous activity during active treatment. QOL was measured by the Functional Assessment of Cancer Therapy-Breast Cancer. Linear regression models tested cross-sectional associations of QOL and functional well-being with physical activity and covariates [socio-demographics, comorbidity, body mass index (BMI), clinical variables, social support, and assessment timing]. Physical activity had a significant positive unadjusted association with all QOL sub-scales (except emotional well-being) (all P values < 0.01). Overall QOL was 4.6 points higher for women in the highest quartile of moderate and vigorous activity versus women in the lowest quartile (P<0.001). In regression models, higher activity was associated with better overall QOL and functional well-being, controlling for covariates (P<0.05). Increasing BMI was also independently but inversely associated with overall QOL (P<0.001) but did not explain the relationship of activity and QOL. White women reported the higher levels of activity than minority women and activity was associated with QOL for Whites but not for minority women. Greater physical activity is associated with small but clinically meaningful increases in QOL during active breast cancer care therapy for Whites but this effect is not seen for minority women. If confirmed in longitudinal analyses, these differences may have implications for disparities research.

Design of the Steps to Health Study of Physical Activity in Survivors of Endometrial Cancer: Testing a Social Cognitive Theory Model

Physical activity has been shown to benefit cancer survivors' physical functioning, emotional well-being, and symptoms. Physical activity may be of particular benefit to survivors of endometrial cancer because they are more likely to be obese and sedentary than the general population, as these are risk factors for the disease, and thus experience a number of related co-morbid health problems. However, there is little research systematically studying mechanisms of physical activity adherence in cancer survivor populations. This paper describes the design of the Steps to Health study, which applies a Social Cognitive Theory-based model of endometrial cancer survivors' adoption and maintenance of exercise in the context of an intervention to increase walking or other moderate intensity cardiovascular activity. In Steps to Health we will test the influence of self-efficacy and outcome expectations on adherence to exercise recommendations, as well as studying the determinants of self-efficacy. Endometrial cancer survivors who are at least 6 months post-treatment are provided with an intervention involving print materials and telephone counseling, and complete assessments of fitness, activity, self-efficacy and outcome expectations, and determinants of self-efficacy every two months for a six month period. In addition to testing an innovative model, the Steps to Health study employs multiple assessment methods, including ecological momentary assessment, implicit tests of cognitive variables, and ambulatory monitoring of physical activity. The study results can be used to develop more effective interventions for increasing physical activity in sedentary cancer survivors by taking into account the full complement of sources of self-efficacy information and outcome expectations.

Physical activity motivation and cancer survivorship

Physical activity (PA) participation has been shown to be helpful in improving physical and mental well-being among cancer survivors. The purpose of this chapter is to review the literature on the determinants of physical activity motivation and behavior among cancer survivors. Using theories of behavior change, researchers have sought to identify the correlates of motivation that predict the participation in regular physical activity in observational studies, while intervention studies have focused on manipulating those factors to support the initiation of physical activity. The majority of this work has been conducted with breast cancer survivors, and there is an interest in expanding this work to survivors of others cancers (e.g., prostate, lung, and colorectal cancer). Results suggest that constructs from the Theory of Planned Behavior (TPB), Transtheoretical Model (TTM), and Social Cognitive Theory (SCT) are associated with greater motivation for physical activity, and some of these constructs have been used in interventions to promote physical activity adoption. There is scope for understanding the determinants of physical activity adoption in various cancer survivor populations. Much more needs to done to identify the determinants of maintenance of physical activity.

An exploratory study of the factors that influence physical activity for prostate cancer survivors

PURPOSE

To gain an understanding of the factors that influence participation in physical activity for survivors of prostate cancer and to examine changes in participation in physical activity pre- and post-diagnosis.

METHODS

Eighteen men who had completed treatment for prostate cancer 6 months prior were interviewed for this study. Constant comparison was used to examine the main themes arising from the interviews.

RESULTS

Barriers to physical activity tended not to be related to the physical side effects of treatment, however lack of confidence following treatment, co-morbidities, older age physical decline and lack of time were barriers. Motivations for physical activity included psychological benefits, physical benefits, and the context of the activity. Participants did not recall receiving information about physical activity from clinicians and few were referred to exercise specialists. Physical activity 6 months post-treatment was similar to physical activity levels prior to diagnosis, although there was some decline in terms of the intensity of participation.

CONCLUSIONS

Interventions to increase physical activity for this group will need to take into account co-morbidities and decline associated with older age, as well as treatment side effects and psychological issues associated with a cancer diagnosis. Encouragement from health care professionals and referral to an exercise specialist is likely to give men more confidence to participate in physical activity.