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OBJECTIVE: This study evaluated the effect of two home-based exercise interventions (one culturally adapted and one standard) on changes in social cognitive theory (SCT) variables, physical activity (PA), and sedentary time (ST), and determined the association between changes in SCT variables and changes in PA and ST in Hispanic breast cancer survivors. METHOD: Project VIVA! was a 16-week randomized controlled pilot study to test the effectiveness and feasibility of a culturally adapted exercise intervention for Mexican American and Puerto Rican breast cancer survivors in Houston, Texas and San Juan, Puerto Rico, respectively. Women (N = 89) completed questionnaires on SCT variables, PA, and ST and were then randomized to a 16-week culturally adapted exercise program, a non-culturally adapted standard exercise intervention or a wait-list control group. Multiple regression models were used to determine associations between changes in SCT variables and changes in PA and ST. RESULTS: Participants were in their late 50s (58.5 ± 9.2 years) and obese (31.0 ± 6.5 kg/m2 ). Women reported doing roughly 34.5 min/day of PA and spending over 11 h/day in sedentary activities. Across groups, women reported significant increases in exercise self-efficacy and moderate-intensity, vigorous-intensity, and total PA from baseline to follow-up (p < 0.05). Increased social support from family was associated with increases in vigorous-intensity PA. Increases in social modeling were associated with increases in moderate-intensity and total PA and with decreases in ST from baseline to follow-up (p < 0.05). CONCLUSIONS: Hispanic cancer survivors benefit from PA interventions that focus on increasing social support from family and friends and social modeling. Copyright © 2015 John Wiley & Sons, Ltd.
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Neoplasias da Mama/psicologia , Sobreviventes de Câncer/psicologia , Hispânico ou Latino/psicologia , Comportamento Sedentário/etnologia , Apoio Social , Adulto , Neoplasias da Mama/reabilitação , Redes Comunitárias , Exercício Físico/psicologia , Feminino , Humanos , Pessoa de Meia-Idade , Projetos Piloto , Autoeficácia , Inquéritos e Questionários , Saúde da Mulher/etnologiaRESUMO
OBJECTIVE: Breast cancer survivors do not engage in appropriate levels of physical activity, despite the known benefits of such activity. This study aims to describe physical-activity levels and the barriers to it in a group of Puerto Rican breast cancer survivors, as well as detailing their preferences for an intervention. METHODS: Participants who finished their chemotherapy and/or radiotherapy for breast cancer at least 4 months prior to the study were included. Demographic, anthropometric, and clinical data were obtained. The Godin Leisure-Time Exercise Questionnaire (GLTEQ) and questionnaires on exercise self-efficacy, barriers to self-efficacy, modeling, and social support were filled out by study participants. Data on access to exercise equipment and preferences regarding a physical-activity intervention were collected. Descriptive statistics and correlation analyses were performed. RESULTS: Fifty breast cancer survivors were recruited. Almost all the participants reported that they did not engage in any kind of strenuous physical activity (94%), with more than three fourths (76%) reporting that they did not even participate in any kind of moderate physical activity. The GLTEQ score was associated with barriers to selfefficacy, while the association with exercise self-efficacy approached significance (p = 0.055). Nearly half of the patients (44%) had access to exercise equipment. Preferred methods for the delivery of physical-activity interventions were participating in group settings (72%) and receiving material in the postal mail (44%). CONCLUSION: The study described herein reports on the low levels of physical activity being practiced by a group of Puerto Rican breast cancer survivors, despite the fact that many of them had access to exercise equipment and facilities. Further studies aimed at understanding breast cancer survivors' barriers to physical activity and at developing culturally competent interventions to increase the levels of such activity are warranted.
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Neoplasias da Mama/reabilitação , Exercício Físico , Atividade Motora , Sobreviventes/estatística & dados numéricos , Adulto , Idoso , Neoplasias da Mama/terapia , Feminino , Humanos , Atividades de Lazer , Pessoa de Meia-Idade , Porto Rico , Autoeficácia , Apoio Social , Inquéritos e QuestionáriosRESUMO
BACKGROUND: Few studies to date have used the cancer diagnosis as a teachable moment to promote healthy behavior changes in survivors of cancer and their family members. Given the role of obesity in the primary and tertiary prevention of breast cancer, the authors explored the feasibility of a mother-daughter weight loss intervention. METHODS: A randomized controlled trial of a mailed weight loss intervention was undertaken among 68 mother-daughter dyads (n = 136), each comprised of a survivor of breast cancer (AJCC stage 0-III) and her adult biological daughter. All women had body mass indices ≥ 25 kg/m(2) and underwent in-person assessments at baseline, 6 months, and 12 months, with accelerometry and exercise capacity performed on a subset of individuals. All women received a personalized workbook and 6 newsletters over a 1-year period that promoted weight loss; exercise; and a nutrient-rich, low-energy density diet. A total of 25 dyads received individually tailored instruction (individual), 25 dyads received team-tailored instruction (TEAM), and 18 dyads received standardized brochures (control). RESULTS: The trial met its accrual target, experienced 90% retention, and caused no serious adverse events. Significant differences in baseline to 12-month changes were observed between individual versus control mothers for body mass index, weight, and waist circumference (WC); significant differences also were observed in the WC of corresponding daughters (P < .05). Significant differences were found between individual versus control and team versus control dyads for WC (P = .0002 and .018, respectively), minutes per week of physical activity (P = .031 and .036, respectively), and exercise capacity (P = .047 for both). CONCLUSIONS: Significant improvements in lifestyle behaviors and health outcomes are possible with tailored print interventions directed toward survivors of cancer and their family members. For greater impact, more research is needed to expand this work beyond the mother-daughter dyad.
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Neoplasias da Mama/terapia , Obesidade/terapia , Adulto , Idoso , Idoso de 80 Anos ou mais , Índice de Massa Corporal , Neoplasias da Mama/complicações , Exercício Físico , Comportamento Alimentar , Feminino , Comportamentos Relacionados com a Saúde , Humanos , Pessoa de Meia-Idade , Mães , Núcleo Familiar , Obesidade/complicações , Sobreviventes , Redução de PesoRESUMO
PURPOSE: Reduced stress and reduced risk of cancer recurrence are among the many benefits of physical activity (PA) for cancer survivors. Exercise behaviors are linked to motivational factors. We investigated the associations between motivational profile, self-reported levels of PA and stress, and mental functioning in 94 posttreatment breast cancer survivors who voluntarily enrolled in an exercise program. METHODS: Participants completed the Apter Motivational Style Profile (AMSP), Lifetime of Physical Activity (LTPA) Questionnaire, International Physical Activity Questionnaire (IPAQ), Medical Outcomes Short Form SF-36® (SF-36), and Perceived Stress Scale (PSS) and provided 10 saliva specimens (to measure cortisol levels). PA levels were calculated in metabolic equivalent hours per week (MET-hours/week). RESULTS: Participants reported high levels of current and historical PA (M = 39.2 MET-h/week, SD = 39.7; M = 14.2 MET-h/week, SD = 15.4, respectively). They also reported high levels of stress (M = 33.6, SD = 4.5) coupled with low mental functionality as measured by SF-36 mental component scale (MCS) (M = 44.4, SD = 8.8). PSS was negatively associated with MCS (r = -0.27, p = 0.009). Salivary cortisol was not associated with any measure. Participants had a conformist ("follow rules") and alloic ("about others") motivational profile. No motivational, exercise history, or stress variables were associated with current PA. CONCLUSIONS: As expected, participants reported higher levels of stress and lower mental functioning. Participants presented a unique motivational profile relative to the general population. Further research into the associations of motivation, exercise behaviors, and stress is warranted.
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Neoplasias da Mama , Exercício Físico , Motivação , Estresse Psicológico , Adulto , Idoso , Neoplasias da Mama/epidemiologia , Feminino , Humanos , Pessoa de Meia-Idade , Pós-Menopausa , Inquéritos e Questionários , SobreviventesRESUMO
RATIONALE: Cardiotoxicity is a troubling long-term side effect of chemotherapy cancer treatment, affecting therapy and quality of life (QOL). Exercise is beneficial in heart failure (HF) patients and in cancer survivors without HF, but has not been tested in cancer survivors with treatment induced HF. METHODS: We present case studies for two survivors: a 56-year old female Hodgkin's lymphoma survivor (Pt 1) and a 44-year old male leukemia survivor (Pt 2). We conducted a 16-week exercise program with the goal of 30 minutes of exercise performed 3 times per week at a minimum intensity of 50% heart rate reserve (HRR) or '12' rating of perceived exertion (RPE). RESULTS: Pt 1 improved from 11.5 minutes of exercise split over two bouts at an RPE of 14 to a 30 minute bout at an RPE of 15. Pt 2 improved from 11 minutes of exercise split over two bouts at an RPE of 12 to an 18 minute bout at an RPE of 12. Both improved in VO(2) peak (Pt 1: 13.9 to 14.3 mlO(2)/kg/min; Pt 2: 12.5 to 18.7 mlO(2)/kg/min). Ejection fraction increased for Pt 2 (25-30% to 35-40%) but not for Pt 1 (35-40%). QOL as assessed by the SF-36 Physical Component Scale (PCS) improved from 17.79 to 25.31 for Pt 1 and the Mental Component Scale (MCS) improved from 43.84 to 56.65 for Pt 1 and from 34.79 to 44.45 for Pt 2. CONCLUSIONS: Properly designed exercise interventions can improve physical functioning and quality of life for this growing group of survivors.
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BACKGROUND: Home-based exercise interventions might be a desirable long-term option for breast cancer survivors to enhance compliance and long-term health benefits. PURPOSE: To assess the effectiveness of a home-based intervention aimed at helping survivors of breast cancer meet the physical activity guidelines of the American College of Sports Medicine. METHODS: Eighty-nine women (age: 55.4 ± 10 years; BMI: 31 ± 6.5 kg/m2) from two cancer centers serving Hispanic women participated in this study. Women performed a baseline assessment of cardiorespiratory fitness, muscle endurance and strength, flexibility, range of motion, and extremity disability. After baseline measures, women were randomized into a control (C) or exercise (E) group. The exercise intervention consisted of a walking program, elastic band strengthening, and flexibility exercises performed at home. The outcome measures were reassessed 16 weeks after baseline measures. RESULTS: The intervention showed a strong effect of time on muscle strength and shoulder range of motion, and time and group for self-reported disability. There were no differences in sedentary behavior, physical fitness, and disability measures across intervention groups, including both exercise groups combined and changes over time between intervention groups. CONCLUSION: It appears that a home-based intervention affects only upper body strength and related disability, indicating that other components might need closer monitoring for significant changes to occur across time.
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BACKGROUND: Career development awards are important to the professional careers of many junior scientists. Designed to launch researchers as independent scientists earlier in their careers, such grants release them from full schedules of teaching and clinical service, protecting their time for research and publishing. Yet few know how best to embark on this crucial endeavor. METHODS: We pilot tested a faculty-facilitated, biweekly working group for postdoctoral fellows and junior faculty preparing career development applications. Based on their needs and interests, sessions included didactic activities, structured panel discussions, identification of resources, and individual guidance. For those unable to attend regularly, e-mail kept them informed of information shared and lessons learned, as summarized by participants on a rotating basis. RESULTS: Although success in terms of funded applications is yet unknown, preliminary evaluation suggests high satisfaction among the participants. CONCLUSIONS: Ultimately, if successful, a low-cost, easy-to-administer working group approach such as this can add great value to any training program.
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Mobilidade Ocupacional , Pesquisadores/organização & administração , Apoio à Pesquisa como Assunto/organização & administração , Desenvolvimento de Pessoal , Estudos de Avaliação como Assunto , HumanosRESUMO
OBJECTIVE: To report baseline data from a physical activity (PA) intervention for Latina breast cancer survivors, and assess the relationship between PA, fitness, and disability. METHODS: Eighty-nine Latina breast cancer survivors from San Juan, PR and Houston, TX (age: 55.4 ± 9.9 years; BMI: 29.87 ± 5.62 kg/m2; ≥ 3 months post-treatment) participated in this study. At baseline participants completed fitness testing (six-minute walk test [6MWT], 30-second sit-stand; grip strength, lower and upper extremity and low back strength, shoulder range of motion, balance testing), and assessment of physical activity (PA) and disability. PA was assessed using the International Physical Activity Questionnaire (IPAQ). A subsample (n = 27) received an accelerometer to compare objective versus self-reported PA. RESULTS: Participants exhibited low PA (M = 76.5 MET·minutes/week; SD = 183.4), poor fitness (6MWT M = 436.4 meters, SD = 99.1; 30s sit-stand, M = 11.6 stands, SD = 3.1), and no detectable disability. In an adjusted model lower extremity fitness was associated with PA, with a one repetition increase in sit-to-stand associated with 49 additional minutes of self-reported PA plus walking per week. The correlation between IPAQ moderate-vigorous PA and accelerometer was 0.38 (p = 0.047). CONCLUSION: Latina breast cancer survivors have low physical activity and fitness levels that increase their risk of disability, cardiometabolic comorbidities, and potential cancer recurrence.
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Neoplasias da Mama/terapia , Sobreviventes de Câncer , Avaliação da Deficiência , Exercício Físico , Hispânico ou Latino , Aptidão Física , Comportamento Sedentário/etnologia , Actigrafia/instrumentação , Adulto , Idoso , Idoso de 80 Anos ou mais , Fenômenos Biomecânicos , Neoplasias da Mama/etnologia , Tolerância ao Exercício , Feminino , Monitores de Aptidão Física , Nível de Saúde , Humanos , Pessoa de Meia-Idade , Força Muscular , Equilíbrio Postural , Porto Rico/epidemiologia , Amplitude de Movimento Articular , Inquéritos e Questionários , Texas/epidemiologia , Teste de CaminhadaRESUMO
INTRODUCTION: Preliminary evidence supports the beneficial role of physical activity on prostate cancer outcomes. This phase III randomised controlled trial (RCT) is designed to determine if supervised high-intensity aerobic and resistance exercise increases overall survival (OS) in patients with metastatic castrate-resistant prostate cancer (mCRPC). METHODS AND ANALYSIS: Participants (n=866) must have histologically documented metastatic prostate cancer with evidence of progressive disease on androgen deprivation therapy (defined as mCRPC). Patients can be treatment-naïve for mCRPC or on first-line androgen receptor-targeted therapy for mCRPC (ie, abiraterone or enzalutamide) without evidence of progression at enrolment, and with no prior chemotherapy for mCRPC. Patients will receive psychosocial support and will be randomly assigned (1:1) to either supervised exercise (high-intensity aerobic and resistance training) or self-directed exercise (provision of guidelines), stratified by treatment status and site. Exercise prescriptions will be tailored to each participant's fitness and morbidities. The primary endpoint is OS. Secondary endpoints include time to disease progression, occurrence of a skeletal-related event or progression of pain, and degree of pain, opiate use, physical and emotional quality of life, and changes in metabolic biomarkers. An assessment of whether immune function, inflammation, dysregulation of insulin and energy metabolism, and androgen biomarkers are associated with OS will be performed, and whether they mediate the primary association between exercise and OS will also be investigated. This study will also establish a biobank for future biomarker discovery or validation. ETHICS AND DISSEMINATION: Validation of exercise as medicine and its mechanisms of action will create evidence to change clinical practice. Accordingly, outcomes of this RCT will be published in international, peer-reviewed journals, and presented at national and international conferences. Ethics approval was first obtained at Edith Cowan University (ID: 13236 NEWTON), with a further 10 investigator sites since receiving ethics approval, prior to activation. TRIAL REGISTRATION NUMBER: NCT02730338.
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Antagonistas de Androgênios/uso terapêutico , Terapia por Exercício/métodos , Neoplasias de Próstata Resistentes à Castração/mortalidade , Neoplasias de Próstata Resistentes à Castração/terapia , Qualidade de Vida , Androstenos/uso terapêutico , Benzamidas , Ensaios Clínicos Fase III como Assunto , Progressão da Doença , Humanos , Masculino , Estudos Multicêntricos como Assunto , Nitrilas , Feniltioidantoína/análogos & derivados , Feniltioidantoína/uso terapêutico , Ensaios Clínicos Controlados Aleatórios como Assunto , Receptores Androgênicos/efeitos dos fármacos , Estados Unidos/epidemiologiaRESUMO
For cancer survivors, who also often present with co-existing health conditions, exercise testing is often performed using submaximal protocols incorporating linear heart rate response for estimating the cardiorespiratory capacity and assessing exercise tolerance. However, use of beta-blocker medications, during sub-maximal protocols based on linear HR response can be problematic. Rating of perceived exertion (RPE), which takes into account an individual's overall perception of effort, can be used as a complementary tool that does not rely solely on the heart rate response to increased workload. We compared heart rate response (VO2HR) and self-rating of perceived exertion (VO2RPE) in a graded submaximal exercise test (GXT) in 93 endometrial cancer survivors. The results of the GXT were stratified according to whether participants were taking beta-blocker (BB) medications or not (non-BB). Among non-BB participants, there was no difference between the mean VO2HR and the mean VO2RPE estimates of cardiorespiratory capacity (mlO2//kg/min) (20.4 and 19.3, respectively; p = 0.166). Among BB participants, the mean VO2HR approached significant difference than the mean VO2RPE (21.7 mlO2//kg/min and 17.6 mlO2//kg/min, respectively; p = 0.087). Bland-Altman plots for both methods showed a proportional bias for the non-BB group; but not the BB group. Our results suggest that sub-maximal protocols based on Borg's Rating of Perceived exertion (RPE) produce differing results from sub-maximal protocols based on HR response when applied to clinical population taking BB medications. Using RPE instead of HR for participants on BB medications may be a better method for assessing the exercise tolerance for estimating the cardiorespiratory capacity in sub-maximal exercise testing.
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Sobreviventes de Câncer , Aptidão Cardiorrespiratória , Neoplasias do Endométrio/terapia , Teste de Esforço/métodos , Nível de Saúde , Esforço Físico , Autoimagem , Autorrelato , Adulto , Idoso , Ciclismo , Neoplasias do Endométrio/diagnóstico , Neoplasias do Endométrio/fisiopatologia , Tolerância ao Exercício , Feminino , Frequência Cardíaca , Humanos , Análise dos Mínimos Quadrados , Modelos Lineares , Pessoa de Meia-Idade , Consumo de Oxigênio , Valor Preditivo dos TestesRESUMO
Breast cancer is the leading cause of cancer death among Hispanic women. Certain dietary factors have been associated with the risk of breast cancer recurrence, but data in Hispanic survivors is scarce. OBJECTIVE: to examine dietary patterns and diet quality in two groups of Hispanic breast cancer survivors. METHODS: 23 Mexican-American (MA) and 22 Puerto Rican (PR) female breast cancer survivors completed a culturally adapted validated food frequency questionnaire. Intake was standardized per 1000 kcal and compared to US Dietary Guidelines and the DASH-style diet adherence score was calculated. RESULTS: Overweight/obese was 70 % in MA and 91 % in PR. PR consumed diets rich in fruit/100 % fruit juices and beans, while MA diets were high in vegetables, beans, and total grains. Both groups consumed high amounts of starchy vegetables, refined grains, animal protein and calories from solid fats and added sugars but low intakes of whole grains, dairy products and nuts and seeds. DASH scores were relatively low. CONCLUSION: MA and PR female breast cancer survivors have different dietary patterns but both groups had relatively low diet quality. These groups could benefit from culturally tailored interventions to improve diet quality, which could potentially reduce cancer recurrence. ClinicalTrials.gov Identifier NCT01504789.
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Neoplasias da Mama/etnologia , Sobreviventes de Câncer/estatística & dados numéricos , Dieta/etnologia , Hispânico ou Latino/estatística & dados numéricos , Sobrepeso/etnologia , Adulto , Idoso , Pesos e Medidas Corporais , Competência Cultural , Abordagens Dietéticas para Conter a Hipertensão , Ingestão de Energia , Exercício Físico , Comportamento Alimentar/etnologia , Feminino , Promoção da Saúde/organização & administração , Humanos , Americanos Mexicanos/estatística & dados numéricos , México/etnologia , Pessoa de Meia-Idade , Obesidade/etnologia , Projetos Piloto , Porto Rico/etnologia , Comportamento Sedentário , Fatores Socioeconômicos , Estados Unidos/epidemiologiaRESUMO
Yoga-based exercise has proven to be beneficial for practitioners, including cancer survivors. This study reports on the improvements in physical fitness for 20 breast cancer survivors who participated in a six-month yoga-based exercise program (YE). Results are compared to a comprehensive exercise (CE) program group and a comparison (C) exercise group who chose their own exercises. "Pre" and "post" fitness assessments included measures of anthropometrics, cardiorespiratory capacity, strength and flexibility. Descriptive statistics, effect size (d), dependent sample 't' tests for all outcome measures were calculated for the YE group. Significant improvements included: decreased % body fat (-3.00%, d = -0.44, p < 0.001); increased sit to stand leg strength repetitions (2.05, d = 0.48, p = 0.003); forward reach (3.59 cm, d = 0.61, p = 0.01); and right arm sagittal range of motion (6.50°, d = 0.92, p = 0.05). To compare YE outcomes with the other two groups, a one-way analysis of variance (ANOVA) was used. YE participants significantly outperformed C participants on "forward reach" (3.59 cm gained versus -2.44 cm lost), (p = 0.009) and outperformed CE participants (3.59 cm gained versus 1.35 cm gained), but not statistically significant. Our results support yoga-based exercise modified for breast cancer survivors as safe and effective.
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Neoplasias da Mama/terapia , Aptidão Física , Sobreviventes , Yoga , Adiposidade , Idoso , Análise de Variância , Fenômenos Biomecânicos , Teste de Esforço , Feminino , Nível de Saúde , Humanos , Pessoa de Meia-Idade , Força Muscular , Amplitude de Movimento Articular , Texas , Fatores de Tempo , Resultado do TratamentoRESUMO
Yoga-based exercise has proven to be beneficial for practitioners, including cancer survivors. This study reports on the effect on inflammatory biological markers for 20 breast cancer survivors who participated in a six-month yoga-based (YE) exercise program. Results are compared to a comprehensive exercise (CE) program group and a comparison (C) exercise group who chose their own exercises. "Pre" and "post" assessments included measures of anthropometrics, cardiorespiratory capacity, and inflammatory markers interleukin 6 (IL-6), interleukin 8 (IL-8), tumor necrosis factor alpha (TNFα) and C-reactive protein (CRP). Descriptive statistics, effect size (d), and dependent sample 't' tests for all outcome measures were calculated for the YE group. Significant improvements were seen in decreased % body fat, (-3.00%, d = -0.44, p = <.001) but not in cardiorespiratory capacity or in inflammatory serum markers. To compare YE outcomes with the other two groups, a one-way analysis of co-variance (ANCOVA) was used, controlling for age, BMI, cardiorespiratory capacity and serum marker baseline values. We found no differences between groups. Moreover, we did not see significant changes in any inflammatory marker for any group. Our results support the effectiveness of yoga-based exercise modified for breast cancer survivors for improving body composition. Larger studies are needed to determine if there are significant changes in inflammatory serum markers as a result of specific exercise modalities.
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PURPOSE: Physical activity (PA) has a myriad of benefits for breast cancer survivors, including a reduced risk of cancer recurrence. Latinas are less physically active than are women in the general population and little is known about Latina breast cancer survivors' levels of PA or their beliefs related to PA. We conducted a survey of 50 Puerto Rican (PR), 50 Mexican-American (MA) and 50 non-Hispanic white (NHW) breast cancer survivors to investigate similarities and differences in PA and social cognitive theory (SCT) constructs associated with PA. METHODS: We collected information on current PA using the Godin Leisure Time Exercise Questionnaire (GLTEQ); comorbidities; anthropometric measures of body mass index [BMI (kg/m(2))] and waist-to-hip (W:H) ratio; and SCT measures, including exercise self-efficacy, exercise barriers self-efficacy, modeling and social support from friends and family. Descriptive statistics, one-way analysis of variance of differences between groups and regression models of the predictors of PA were performed. RESULTS: Survivors from the three groups were similar in age (M = 56.8, SD = 11.0), BMI (M = 29.0, SD = 5.7) and co-morbidity (M = 2.09, SD = 1.69). Survivors differed in PA (p < 0.001), self-efficacy (p = 0.05), modeling (p = 0.03) and social support from family (p = 0.05). Social support from family member and exercise barriers self-efficacy were predictors of PA. CONCLUSIONS: Consistent with published studies, Hispanic breast cancer survivors self-report that they are less physically active than are non-Hispanic whites. SCT variables associated with PA differ among Hispanic subgroups and non-Hispanic whites. Further research is warranted in order to understand determinants of physical activity for specific ethnic breast cancer survivors.
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OBJECTIVE: This study evaluated whether social-cognitive theory (SCT) variables, as measured by questionnaire and ecological momentary assessment (EMA), predicted exercise in endometrial cancer survivors. METHOD: One hundred posttreatment endometrial cancer survivors received a 6-month home-based exercise intervention. EMAs were conducted by using hand-held computers for 10- to 12-day periods every 2 months. Participants rated morning self-efficacy and positive and negative outcome expectations by using the computer, recorded exercise information in real time and at night, and wore accelerometers. At the midpoint of each assessment period, participants completed SCT questionnaires. Using linear mixed-effects models, the authors tested whether morning SCT variables predicted minutes of exercise that day (Question 1) and whether exercise minutes at time point Tj could be predicted by questionnaire measures of SCT variables from time point Tj-1 (Question 2). RESULTS: Morning self-efficacy significantly predicted that day's exercise minutes (p < .0001). Morning positive outcome expectations were also associated with exercise minutes (p = .0003), but the relationship was attenuated when self-efficacy was included in the model (p = .4032). Morning negative outcome expectations were not associated with exercise minutes. Of the questionnaire measures of SCT variables, only exercise self-efficacy predicted exercise at the next time point (p = .003). CONCLUSIONS: The consistency of the relationship between self-efficacy and exercise minutes over short (same day) and longer (Tj to Tj-1) time periods provides support for a causal relationship. The strength of the relationship between morning self-efficacy and exercise minutes suggest that real-time interventions that target daily variation in self-efficacy may benefit endometrial cancer survivors' exercise adherence.
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Neoplasias do Endométrio/terapia , Terapia por Exercício , Cooperação do Paciente/estatística & dados numéricos , Autoeficácia , Sobreviventes/psicologia , Adulto , Idoso , Feminino , Seguimentos , Humanos , Pessoa de Meia-Idade , Teoria Psicológica , Inquéritos e Questionários , Sobreviventes/estatística & dados numéricos , Fatores de TempoRESUMO
Adipose stromal cells are the primary source of local oestrogens in adipose tissue, aberrant production of which promotes oestrogen receptor-positive breast cancer. Here we show that extracellular matrix compliance and cell contractility are two opposing determinants for oestrogen output of adipose stromal cells. Using synthetic extracellular matrix and elastomeric micropost arrays with tunable rigidity, we find that increasing matrix compliance induces transcription of aromatase, a rate-limiting enzyme in oestrogen biosynthesis. This mechanical cue is transduced sequentially by discoidin domain receptor 1, c-Jun N-terminal kinase 1, and phosphorylated JunB, which binds to and activates two breast cancer-associated aromatase promoters. In contrast, elevated cell contractility due to actin stress fibre formation dampens aromatase transcription. Mechanically stimulated stromal oestrogen production enhances oestrogen-dependent transcription in oestrogen receptor-positive tumour cells and promotes their growth. This novel mechanotransduction pathway underlies communications between extracellular matrix, stromal hormone output, and cancer cell growth within the same microenvironment.
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Tecido Adiposo/metabolismo , Estrogênios/metabolismo , Estresse Mecânico , Tecido Adiposo/citologia , Tecido Adiposo/efeitos dos fármacos , Animais , Aromatase/genética , Aromatase/metabolismo , Fenômenos Biomecânicos/efeitos dos fármacos , Neoplasias da Mama/metabolismo , Neoplasias da Mama/patologia , Bovinos , Técnicas de Cultura de Células , Colágeno/metabolismo , Meios de Cultivo Condicionados/farmacologia , Citoesqueleto/efeitos dos fármacos , Citoesqueleto/metabolismo , Receptor com Domínio Discoidina 1 , Estrogênios/biossíntese , Matriz Extracelular/efeitos dos fármacos , Matriz Extracelular/metabolismo , Feminino , Técnicas de Silenciamento de Genes , Humanos , Integrina beta1/metabolismo , Sistema de Sinalização das MAP Quinases , Mecanotransdução Celular/efeitos dos fármacos , Modelos Biológicos , Fosforilação/efeitos dos fármacos , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Receptores Proteína Tirosina Quinases/metabolismo , Receptores de Estrogênio/metabolismo , Células Estromais/efeitos dos fármacos , Células Estromais/enzimologia , Transcrição Gênica/efeitos dos fármacosRESUMO
Qualitative data was collected from Mexican-American (MA) and Puerto Rican (PR) breast cancer survivors to gain their perspectives on the relevant issues surrounding breast cancer survivorship and exercise. Six focus groups, a total of 31 participants were convened (three in Puerto Rico and three in Texas). Responses were analyzed and compared between the MA and PR groups. Follow-up sessions were conducted at the sites to review the initial results and to validate a culturally adapted exercise intervention trial. A total of 900 responses were catalogued into 27 codes. Both groups had similar descriptions of exercise and barriers to exercise. Both groups expressed lack of information regarding their exercise capabilities. The groups differed in their responses to perceived safety in their community and how to deliver a culturally adapted exercise intervention in their community. We found important cultural differences and similarities in relevant factors of exercise and breast cancer survivorship.
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Atitude Frente a Saúde/etnologia , Neoplasias da Mama/etnologia , Exercício Físico/psicologia , Hispânico ou Latino/psicologia , Americanos Mexicanos/psicologia , Sobreviventes/psicologia , Adulto , Idoso , Neoplasias da Mama/psicologia , Cultura , Feminino , Grupos Focais , Hispânico ou Latino/estatística & dados numéricos , Humanos , Americanos Mexicanos/estatística & dados numéricos , Pessoa de Meia-Idade , Porto Rico/etnologiaRESUMO
OBJECTIVES: To determine whether self-reported exercise duration and intensity matched accelerometer data in sedentary endometrial cancer survivors and age-matched controls. METHODS: Participants were asked to wear an accelerometer and self-report exercise bouts, duration, and intensity for one week. Self-reported duration was compared with accelerometer data. RESULTS: Self-reported exercise-bout duration matched accelerometer duration 93% for survivors and 99% for controls. Self-reported exercise-bout intensity matched accelerometer intensity 70% for survivors and 66% for controls. There were no significant differences between groups. CONCLUSIONS: Sedentary endometrial cancer survivors and controls self-reported duration and intensity of physical activity consistent with accelerometer data.
Assuntos
Exercício Físico/psicologia , Monitorização Ambulatorial/instrumentação , Comportamento Sedentário , Autorrelato , Sobreviventes/psicologia , Adulto , Idoso , Feminino , Humanos , Pessoa de Meia-Idade , Monitorização Ambulatorial/métodosRESUMO
Stress is associated with many health maladies, including cancers. Exercise is an effective stress-management tool and is important for physical health. The number of Hispanic women who engage in enough exercise is low. Thus, promoting exercise for this population is of critical importance. Individual effectiveness of behavioral interventions can often be lost in group analyses. Therefore, we employed both group analyses and single-system methodology to test the effectiveness of an exercise program for 25 Hispanic breast cancer survivors. Measures of physical fitness, quality of life, self-reported stress, and salivary cortisol were taken repeatedly before, during, and after the intervention. The intervention improved physical fitness, reduced perceived stress, and decreased cortisol levels as evidenced by both group and single-system analyses.