Mediators of physical activity maintenance during a 12-month randomized controlled trial among breast Cancer survivors.

PURPOSE: To explore the theoretical constructs that functioned as mediators of interventions for moderate-to-vigorous physical activity (MVPA) maintenance among breast cancer survivors. METHOD: 161 survivors were randomized into 3 groups: Reach Plus, Reach Plus Message or Reach Plus Phone. All participants received a 3-month theory-based intervention delivered by volunteer coaches. During months 4-9, all participants monitored their MVPA and received feedback reports. Additionally, Reach Plus Message received weekly text/email messages and Reach Plus Phone received monthly calls from their coaches. Assessments of weekly MVPA minutes and theoretical constructs (self-efficacy, social support, physical activity [PA] enjoyment and PA barriers) were obtained at baseline, 3, 6, 9 and 12-months. ANALYSES: Using a multiple mediator analysis with a product of coefficients approach, we examined mechanisms associated with between-group differences over time in weekly MVPA minutes. RESULTS: Self-efficacy mediated effects of Reach Plus Message vs. Reach Plus at 6 (ab = 16.99) and 9 M (ab = 27.45); social support mediated effects at 6 (ab = 4.86), 9 (ab = 14.30) and 12 M (ab = 6.18). Self-efficacy mediated effects of Reach Plus Phone vs. Reach Plus at 6 (ab = 18.76), 9 (ab = 28.93) and 12 M (ab = 18.18). Social support mediated effects of Reach Plus Phone vs. Reach Plus Message at 6 (ab=-5.50) and 9 M (ab=-13.20); PA enjoyment mediated effects at 12 M (ab=-3.63). CONCLUSIONS: PA maintenance efforts should focus on strengthening breast cancer survivors' self-efficacy and obtaining social support.The trial was registered at ClinicalTrials.Gov: NCT02694640 (Feb. 26, 2016).

Peer mentoring for physical activity adoption and maintenance among breast cancer survivors: moderators of physical activity outcomes.

PURPOSE: We aimed to identify the moderators of maintenance strategies' effects to assist cancer care organizations that offer peer mentoring physical activity programs. METHODS: A total of 161 inactive breast cancer survivors participated in a 12-month study and were randomized to one of three conditions at baseline. American Cancer Society's Reach to Recovery coaches delivered weekly calls to participants for the first 3 months. During Months 4-9, participants self-monitored PA and received feedback (Reach Plus) or additionally received monthly calls from coaches (Reach Plus Phone) or weekly text/email messages (Reach Plus Message). Moderate-to-vigorous PA (MVPA) was assessed using self-report and accelerometry at baseline, 3, 6, 9, and 12 months. We examined baseline demographics, cancer-specific, and social cognitive variables as potential moderators of MVPA. Using Latent Class Models, we identified three participant profiles. The profile was used as a moderator in longitudinal mixed-effects models of MVPA. RESULTS: Profile 1 (44%) were married, White, in preparation, with higher income and higher social support. Profile 2 (41%) were older, office employees, African American, with higher PA self-efficacy. Profile 3 (15%) were diagnosed with stage 1 cancer, in contemplation, with higher MVPA and lower social support. At follow-ups, among those with Profile 1, Reach Plus participants had higher MVPA than other groups (f2 [Formula: see text].10). Among those with Profile 2, Reach Plus Message participants had higher mean MVPA than other groups (f2 [Formula: see text].11). Among those with Profile 3, Reach Plus Phone participants had higher MVPA than other groups, f2 [Formula: see text].11 (all ps < .05). CONCLUSIONS: Organizations can choose PA maintenance strategies that are most effective for survivors with specific profiles. IMPLICATIONS FOR CANCER SURVIVORS: Breast cancer survivors with specific profiles increase PA when receiving certain PA maintenance programs. TRIAL REGISTRATION: ClinicalTrials.gov ID: NCT02694640 (Feb. 26, 2016).

Physical Activity Adoption and Maintenance Among Breast Cancer Survivors: A Randomized Trial of Peer Mentoring.

BACKGROUND: Peer support can extend the reach of physical activity (PA) interventions. In previous studies, peer support via weekly counseling calls increased PA at 3 and 6 months among breast cancer survivors, compared to contact control. However, effects were attenuated at 6 months. Interventions targeting PA maintenance among cancer survivors are limited. Hence, we extended prior work to identify effective PA maintenance interventions. PURPOSE: Following a 3-month PA intervention, the study compared the effects of three 6-month interventions on PA at 12 months. METHODS: One hundred and sixty-one inactive breast cancer survivors participated in a 12-month randomized controlled trial. Intervention delivery was uniform for the first 3-months: all participants received a weekly call with their peer coach to encourage PA. Following month 3, participants self-monitored PA and received feedback reports (Reach Plus) or additionally received, a monthly phone call (Reach Plus Phone), or weekly text message (Reach Plus Message). Moderate-to-vigorous PA (MVPA) was measured using self-report (7 Day PAR) and accelerometry at baseline, 3, 6, 9, and 12 months. RESULTS: At 3 months, there were significant within group increases in self-reported and objectively measured MVPA with no between-group differences (ps > .05). At 6 months, adjusted longitudinal models showed that Reach Plus Message reported an additional 23.83 (SD = 6.33, f2 = .12) min/week of MVPA and Reach Plus Phone reported an additional 18.14 min/week (SD = 5.15, f2 =.16) versus Reach Plus. Results were similar at 9 months. At 12 months, Reach Plus Message and Reach Plus Phone both out-performed Reach Plus (ps = .04 and .05 respectively and effect sizes f2 = .11 and f2 = .21 respectively). Accelerometer data showed similar patterns: Reach Plus Message and Reach Plus Phone out-performed Reach Plus at 6 (f2 = .20) and 9 months (f2 = .09). CONCLUSION: Phone calls from peer mentors and text messaging can support PA maintenance among breast cancer survivors. CLINICAL TRIAL INFORMATION: ClinicalTrials.Gov NCT02694640.

The Effect of Exercise Training on Total Daily Energy Expenditure and Body Composition in Weight-Stable Adults: A Randomized, Controlled Trial.

BACKGROUND: The present study examined, among weight-stable overweight or obese adults, the effect of increasing doses of exercise energy expenditure (EEex) on changes in total daily energy expenditure (TDEE), total body energy stores, and body composition. METHODS: Healthy, sedentary overweight/obese young adults were randomized to one of 3 groups for a period of 26 weeks: moderate-exercise (EEex goal of 17.5 kcal/kg/wk), high-exercise (EEex goal of 35 kcal/kg/wk), or observation group. Individuals maintained body weight within 3% of baseline. Pre/postphysical activity between-group measurements included body composition, calculated energy intake, TDEE, energy stores, and resting metabolic rate. RESULTS: Sixty weight-stable individuals completed the protocols. Exercise groups increased EEex in a stepwise manner compared with the observation group (P < .001). There was no group effect on changes in TDEE, energy intake, fat-free mass, or resting metabolic rate. Fat mass and energy stores decreased among the females in the high-exercise group (P = .007). CONCLUSIONS: The increase in EEex did not result in an equivalent increase in TDEE. There was a sex difference in the relationship among energy balance components. These results suggest a weight-independent compensatory response to exercise training with potentially a sex-specific adjustment in body composition.

Mediators of physical activity adoption and maintenance among breast cancer survivors.

The purpose of this study is to explore the mediators associated with physical activity (PA) within the adoption and maintenance phase of a PA intervention trial among breast cancer survivors. Overall, 192 breast cancer survivors (average age = 55.9 years) were randomized to an Intervention or Control group. Both groups received 8 calls in the first 3-months, 3 monthly calls, and then entered a no-contact maintenance phase for the remaining 6-months. Assessments were completed at baseline, 3-months, 6-months and 12-months. On average, participants were 55.9 years of age (SD = 9.8) and 2.9 years since diagnosis (SD = 2.2). In the adoption phase, all significant univariate mediators (self-efficacy, cognitive and behavioral processes and decisional balance cons) were included in the multivariate model. Results suggest self-efficacy (ab = 13.56, SE = 7.04) and behavioral processes (ab = 36.10, SE = 12.22) were significant for PA adoption. No mediators were identified in the maintenance phase. In the adoption phase, there were significant indirect effects of group on PA adoption through self-efficacy and behavioral processes. There were no indirect effects of group on PA maintenance.

Association of Body Esteem with Fitness and Body Fat Among Colorectal Cancer Survivors: Secondary Analyses from a Randomized Trial.

BACKGROUND: Survival rates among cancer survivors have improved; however, treatments affect body esteem. Body esteem can significantly affect quality of life and depression following cancer treatment. The purpose of these secondary analyses was to examine the relationship between changes in fitness and body fat with changes in body esteem among colorectal cancer survivors who participated in a randomized controlled trial that tested the effects of a 12-week physical activity intervention. METHOD: Male and female colorectal cancer survivors (< 5 years since diagnosis) participated in a randomized controlled trial that tested a 12-week moderate-intensity physical activity intervention. Body esteem, fitness (estimated VO2 peak), and body composition (bioelectrical impedance) were assessed at baseline and follow-up visits (3 months, 6 months, and 12 months). RESULTS: Forty-six colorectal cancer survivors (57 years old, 57% female) completed the study. Improvements in fitness were associated with improvements in body esteem among males at 6-month and 12-month follow-up visits, while improvements in body fat were associated with increased body esteem at 12-month follow-up among females. Improvements in fitness and body fat among stage 0-2 survivors were associated with significant improvements in body esteem, with no significant changes among stage 3 survivors. CONCLUSION: Results from this study showed that improved fitness and body composition can improve body esteem among these survivors; however, differences exist among gender and disease stage. TRIAL REGISTRATION: https://clinicaltrials.gov/ct2/show/NCT00230646?term=Pinto&cond=Colorectal+Cancer&rank=2.

Predictors of sedentary behavior among colorectal survivors.

PURPOSE: Colorectal cancer (CRC) survivors spend approximately 9 h per day in sedentary behavior (SED), despite recommendations to reduce sitting time. The purpose of this study was to examine predictors of SED among CRC survivors over a 1-year duration. METHODS: Male and female CRC survivors (< 5 years since diagnosis) participated in a 12-week moderate-to-vigorous physical activity randomized controlled trial. To measure SED, participants were given a CSA monitor to wear for three consecutive days (including one weekend day). Additionally, fitness (Treadmill walk test), body composition (bioelectrical impedance analysis) and questionnaires (Profile of Mood States, Exercise Processes of Change and Self-Efficacy for Exercise) were administered. Follow-up assessments were completed at a 3-month, 6-month, and 12-month follow-up. RESULTS: Forty-six colorectal survivors (average age = 57.3 ± 9.7 years) completed the 12-month study. Using latent class models, four classes of SED behavior over time were identified: class 1 (high and sustained SED over time), class 2 (low and sustain SED over time), class 3 (increasing SED over time), and class 4 (high SED through 6-months, followed be a marked decrease at 12-months). Males were more likely to be in class 1, while majority of females were in class 3. Those CRC survivors with a better mood at baseline were in class 2, while those with poor fitness, high body fat, and higher cognitive processes at baseline were in class 3. CONCLUSION: Identifying the characteristics of survivors who engage in high SED can help healthcare providers to target their efforts to reduce SED.