***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: CONTEXT Depressive symptoms predict adverse cardiovascular outcomes in patients with coronary heart disease , but the mechanisms responsible for this association are unknown . OBJECTIVE To determine why depressive symptoms are associated with an increased risk of cardiovascular events . DESIGN AND PARTICIPANTS The Heart and Soul Study is a prospect i ve cohort study of 1017 out patients with stable coronary heart disease followed up for a mean ( SD ) of 4.8 ( 1.4 ) years . SETTING Participants were recruited between September 11 , 2000 , and December 20 , 2002 , from 12 outpatient clinics in the San Francisco Bay Area and were followed up to January 12 , 2008 . MAIN OUTCOME MEASURES Baseline depressive symptoms were assessed using the Patient Health Question naire ( PHQ ) . We used proportional hazards models to evaluate the extent to which the association of depressive symptoms with subsequent cardiovascular events ( heart failure , myocardial infa rct ion , stroke , transient ischemic attack , or death ) was explained by baseline disease severity and potential biological or behavioral mediators . RESULTS A total of 341 cardiovascular events occurred during 4876 person-years of follow-up . The age-adjusted annual rate of cardiovascular events was 10.0 % among the 199 participants with depressive symptoms ( PHQ score > or = 10 ) and 6.7 % among the 818 participants without depressive symptoms ( hazard ratio [ HR ] , 1.50 ; 95 % confidence interval , [ CI ] , 1.16 - 1.95 ; P = .002 ) . After adjustment for comorbid conditions and disease severity , depressive symptoms were associated with a 31 % higher rate of cardiovascular events ( HR , 1.31 ; 95 % CI , 1.00 - 1.71 ; P = .04 ) . Additional adjustment for potential biological mediators attenuated this association ( HR , 1.24 ; 95 % CI , 0.94 - 1.63 ; P = .12 ) . After further adjustment for potential behavioral mediators , including physical inactivity , there was no significant association ( HR , 1.05 ; 95 % CI , 0.79 - 1.40 ; P = .75 ) . CONCLUSION In this sample of out patients with coronary heart disease , the association between depressive symptoms and adverse cardiovascular events was largely explained by behavioral factors , particularly physical inactivity Background : Few exercise trials in cancer patients have reported longer-term follow-up . Here , we report a 6-month follow-up of exercise behavior and patient-rated outcomes from an exercise trial in breast cancer patients . Methods : Breast cancer patients initiating adjuvant chemotherapy ( n = 242 ) were r and omly assigned to usual care ( n = 82 ) , resistance exercise training ( RET ; n = 82 ) , or aerobic exercise training ( AET ; n = 78 ) for the duration of their chemotherapy . At 6-month follow-up , participants were mailed a question naire that assessed quality of life , self-esteem , fatigue , anxiety , depression , and exercise behavior . Results : Two hundred one ( 83.1 % ) participants provided 6-month follow-up data . Adjusted linear mixed-model analyses showed that , at 6-month follow-up , the RET group reported higher self-esteem [ adjusted mean difference , 1.6 ; 95 % confidence interval ( 95 % CI ) , 0.1 - 3.2 ; P = 0.032 ] and the AET group reported lower anxiety ( adjusted mean difference , −4.7 ; 95 % CI , −0.0 to −9.3 ; P = 0.049 ) compared with the usual care group . Moreover , compared with participants reporting no regular exercise during the follow-up period , those reporting regular aerobic and resistance exercise also reported better patient-rated outcomes , including quality of life ( adjusted mean difference , 9.5 ; 95 % CI , 1.2 - 17.8 ; P = 0.025 ) . Conclusions : Improvements in self-esteem observed with RET during breast cancer chemotherapy were maintained at 6-month follow-up whereas reductions in anxiety not observed with AET during breast cancer chemotherapy emerged at 6-month follow-up . Moreover , adopting a combined aerobic and resistance exercise program after breast cancer chemotherapy was associated with further improvements in patient-rated outcomes . Exercise training during breast cancer chemotherapy may result in some longer-term and late effects for selected patient-rated outcomes . ( Cancer Epidemiol Biomarkers Prev 2007;16(12):2572–8 PURPOSE / OBJECTIVES To compare the effectiveness of a prescribed home-based walking exercise intervention with usual care in older women receiving hormonal treatment for breast cancer , and to examine relationships among levels of the cortisol , serotonin , interleukin-6 , and bilirubin biomarkers and fatigue , sleep disturbances , and depressive symptoms . DESIGN Longitudinal r and omized clinical trial . SETTING A National Cancer Institute- design ated cancer center in the southeastern United States . SAMPLE 20 women ( aged 55 years or older ) with breast cancer receiving hormonal treatment . METHODS Participants were r and omized to a walking exercise intervention or usual care . Laboratory sample s and the Pittsburgh Sleep Quality Index ( PSQI ) , the Piper Revised Fatigue Scale , and the Center for Epidemiological Studies -Depression Scale were collected at the initial clinic visit and at 12 weeks from the groups . Question naires also were collected at weeks 2 and 14 . MAIN RESEARCH VARIABLES Fatigue , sleep disturbances , depressive symptoms , biomarkers , and exercise . FINDINGS Effect of the exercise intervention on sleep scores was highly significant between groups . Exercise group scores on the PSQI decreased significantly over time ( indicating improved sleep quality ) , although scores did not change significantly within the control group . Sleep actigraphy also showed significantly shorter actual wake time and less movement in the exercise group . Serotonin levels also were significantly affected by the intervention . CONCLUSIONS Data suggest that a walking exercise intervention improves sleep in older women receiving hormonal treatment for their breast cancer . Serotonin levels may be a useful biomarker when assessing sleep disturbances in this group . IMPLICATION S FOR NURSING Clinicians need to be aware that older women receiving hormonal treatment for their breast cancer may experience fatigue , sleep disturbances , and depressive symptoms . Homebased walking activity may reduce symptom severity in this group BACKGROUND Self-management has increasingly been recommended as part of st and ard care for fibromyalgia , a common , poorly understood condition with limited treatment options . Data that assess popular self-management recommendations are scarce . We evaluated and compared the effectiveness of 4 common self-management treatments on function , symptoms , and self-efficacy in women with fibromyalgia . METHODS A total of 207 women with confirmed fibromyalgia were recruited from September 16 , 2002 , through November 30 , 2004 , and r and omly assigned to 16 weeks of ( 1 ) aerobic and flexibility exercise ( AE ) ; ( 2 ) strength training , aerobic , and flexibility exercise ( ST ) ; ( 3 ) the Fibromyalgia Self-Help Course ( FSHC ) ; or ( 4 ) a combination of ST and FSHC ( ST-FSHC ) . The primary outcome was change in physical function from baseline to completion of the intervention . Secondary outcomes included social and emotional function , symptoms , and self-efficacy . RESULTS Improvements in the mean Fibromyalgia Impact Question naire score in the 4 groups were -12.7 for the ST-FSHC group , -8.2 for the AE group , -6.6 for the ST group , and -0.3 for the FSHC group . The ST-FSHC group demonstrated greater improvement than the FSHC group ( mean difference , -12.4 ; 95 % confidence interval [ CI ] , -23.1 to -1.7 ) . The ST-FSHC ( mean difference , 13.6 ; 95 % CI , 2.3 to 24.9 ) and AE ( mean difference , 13.1 ; 95 % CI , 1.6 to 25.6 ) groups had similar improvements in physical function scores on the 36-Item Short-Form Health Survey . Bodily pain scores on the 36-Item Short-Form Health Survey improved in the ST-FSHC ( 14.8 ) , AE ( 13.2 ) , and ST ( 5.7 ) groups . Social function , mental health , fatigue , depression , and self-efficacy also improved . The beneficial effect on physical function of exercise alone and in combination with education persisted at 6 months . CONCLUSIONS Progressive walking , simple strength training movements , and stretching activities improve functional status , key symptoms , and self-efficacy in women with fibromyalgia actively being treated with medication . The benefits of exercise are enhanced when combined with targeted self-management education . Our findings suggest that appropriate exercise and patient education be included in the treatment of fibromyalgia BACKGROUND This pilot study was design ed to test the efficacy of a physical activity program for improving psychological variables and fibromyalgia syndrome ( FMS ) symptoms and to provide preliminary evidence regarding the effects on perceived cognitive symptoms and objective ly measured cognitive performance by FMS patients . METHODS Sixteen women diagnosed with FMS were r and omly assigned to an 18-week physical activity program or to a control condition .  Psychological measures , FMS symptoms , perceived cognitive function , objective measures of cognition , and walking capacity were assessed at baseline and posttest . RESULTS At posttest , there were significant differences in fatigue ( effect size , ES=1.86 ) , depression ( ES=1.27 ) , FMS symptoms ( ES=1.56 ) , self-reported cognitive symptoms ( ES=1.19 ) , and delayed recall performance ( ES=1.16 ) between the physically active group and the control group , indicating that the FMS patients benefited from physical activity . Beneficial effects were also observed for 6 of the 7 objective measures of cognition and ranged from small to large ( ESs=0.26 to 1.06 ) . CONCLUSIONS Given that all FMS patients do not respond well to conventional treatments , these beneficial effects of physical activity are important . Future studies with larger sample s are warranted to test the reliability of the findings for the objective measures of cognition To determine the effects of exercise training programs on psychosocial improvement in uncomplicated postmyocardial infa rct ion patients , 210 male patients hospitalized for an acute myocardial infa rct ion ( MI ) were r and omized to three week symptom limited treadmill ( TM ) plus home exercise training , TM plus medically supervised gym training , TM without formal exercise program or control , where patients were seen only at six months post MI . Patients in this sample were at low risk for psychosocial disturbance ( 13 % were moderate to severely depressed , 23 % reported marital disturbance and 3 % were extremely anxious ) . Patients in the training groups improved from 3 to 26 weeks post MI on all depression and anxiety measures . The gym training group showed a significant reduction on one depression measure compared to no training and on one anxiety measure compared to controls This study examines and compares the effect of aerobic and resistance exercise on emotional and physical function among older persons with initially high or low depressive symptomatology . Data are from the Fitness , Arthritis and Seniors Trial , a trial among 439 persons 60 years or older with knee osteoarthritis r and omized to health education  ( control ) , resistance exercise , or aerobic exercise groups .  Depressive symptoms ( assessed by the Center for Epidemiologic Studies --Depression scale ) and physical function ( disability , walking speed , and pain ) were assessed at baseline and after 3 , 9 , and 18 months . Compared with results for the control group , aerobic exercise significantly lowered depressive symptoms over time . No such effect was observed for resistance exercise . The reduction in depressive symptoms with aerobic exercise was found both among the 98 participants with initially high depressive symptomatology and among the 340 participants with initially low depressive symptomatology and was the strongest for the most compliant persons . Aerobic and resistance exercise significantly reduced disability and pain and increased walking speed both , and to an equal extent , in persons with high depressive symptomatology and persons with low depressive symptomatology Objectives : The aim of the present study was to evaluate the effects of 3 weeks of individualized aerobic exercise training combined with conventional spa therapy on patients ’ assessment of chronic pain and quality of life .  Patients and Methods : 44 patients of either sex and advanced age ( 50 - 70 years ) with chronic pain underwent an inpatient spa therapy in Bad Tatzmannsdorf , Austria . Participants were r and omized into 2 groups , a control group receiving spa therapy alone , and a training group carrying out an additional aerobic training . Every participant performed an exhaustive bicycle exercise test at the beginning of the study . Subsequently , participants of the training group performed individualized training programs , controlled and documented by ambulatory heart rate monitors . At the beginning and the end of the study the following outcome measures were assessed by use of question naires : positive and negative mood , general depression , health satisfaction , general pain , exhaustion , abdominal complaints , and cardiac pain . The results of the question naires were analyzed by use of a MANOVA to evaluate differences between the two groups . Results : We observed positive effects in all participants and on all parameters investigated after 3 weeks of spa therapy . However , no significant differences could be demonstrated between the two groups ( all p > 0.05 ) . Conclusion : Individualized aerobic training does 
    Output:
    
Larger antidepressant effects were obtained when ( 1 ) baseline depressive symptoms were higher , ( 2 ) patients met recommended physical activity levels , and ( 3 ) the trial primary outcome , predominantly function related , was significantly improved among patients having baseline depressive symptoms indicative of mild-to-moderate depression .
Exercise  reduces depressive symptoms among patients with a chronic illness .
Patients with depressive symptoms indicative of mild-to-moderate depression and for whom exercise training improves function-related outcomes achieve the largest antidepressant effects