***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: Background and Purpose — A new gait training strategy for patients with stroke seeks to increase walking speed through treadmill training . This study compares the effects of structured speed-dependent treadmill training ( STT ) ( with the use of an interval paradigm to increase the treadmill speed stepwise according to principles of sport physiology ) with limited progressive treadmill training ( LTT ) and conventional gait training ( CGT ) on clinical outcome measures for patients with hemiparesis . Methods — Sixty ambulatory poststroke patients were each r and omly selected to receive 1 of the 3 different gait therapies : 20 subjects were treated with STT , 20 subjects were trained to walk on a treadmill with a 20 % increase of belt speed over the treatment period ( LTT ) , and 20 subjects were treated with CGT . Treatment outcomes were assessed on the basis of overground walking speed , cadence , stride length , and Functional Ambulation Category scores . Results — After a 4-week training period , the STT group scored significantly higher than the LTT and CGT groups for overground walking speed ( STT versus LTT , P < 0.001 ; STT versus CGT , P < 0.001 ) , cadence ( STT versus LTT , P = 0.007 ; STT versus CGT , P < 0.001 ) , stride length ( STT versus LTT , P < 0.001 ; STT versus CGT , P < 0.001 ) , and Functional Ambulation Category scores ( STT versus LTT , P = 0.007 ; STT versus CGT , P < 0.001 ) . Conclusions — Structured STT in poststroke patients result ed in better walking abilities than LTT or CGT . This gait training strategy provides a dynamic and integrative approach for the treatment of gait dysfunction after stroke OBJECTIVE To compare the effects of speed-dependent treadmill training on gait and balance performance in patients with sub-acute stroke . DESIGN Single-blinded r and omized controlled trial . SUBJECTS A total of 26 patients with sub-acute stroke were r and omly assigned to experimental ( n = 13 ) and control ( n = 13 ) groups . METHODS Subjects in the experimental group underwent short interval walking trials with stepwise increases in treadmill speed ( speed-dependent treadmill training ) , following the principles of sprint training . Control subjects received gait training on the treadmill at a steady speed . Gait speed , stride length , cadence , and Berg 's Balance Score were recorded and analysed before and after the 10 training sessions . RESULTS Results of 2-way repeated measures analysis of variance showed significant group × time interactions for gait speed and stride length ( p < 0.05 ) . Within each subject group there were improvements in all gait parameters and Berg ’s Balance Score after the training programme . In addition , the experimental group showed significantly larger increases in gait speed ( mean 0.15 m/s , 95 % confidence interval 0.04–0.26 ) and stride length ( mean 0.16 m , 95 % confidence interval 0.02–0.30 ) than the control subjects . CONCLUSION Speed-dependent treadmill training in patients with sub-acute stroke result ed in larger gains in gait speed and stride length compared with steady speed . The positive findings provide evidence for clinical practice of speed-dependent treadmill training in enhancing gait function after stroke Background — Exercise training reduces the symptoms of chronic heart failure . Which exercise intensity yields maximal beneficial adaptations is controversial . Furthermore , the incidence of chronic heart failure increases with advanced age ; it has been reported that 88 % and 49 % of patients with a first diagnosis of chronic heart failure are > 65 and > 80 years old , respectively . Despite this , most previous studies have excluded patients with an age > 70 years . Our objective was to compare training programs with moderate versus high exercise intensity with regard to variables associated with cardiovascular function and prognosis in patients with postinfa rct ion heart failure . Methods and Results — Twenty-seven patients with stable postinfa rct ion heart failure who were undergoing optimal medical treatment , including & bgr;-blockers and angiotensin-converting enzyme inhibitors ( aged 75.5±11.1 years ; left ventricular [ LV ] ejection fraction 29 % ; & OV0312;o2peak 13 mL · kg−1 · min−1 ) were r and omized to either moderate continuous training ( 70 % of highest measured heart rate , ie , peak heart rate ) or aerobic interval training ( 95 % of peak heart rate ) 3 times per week for 12 weeks or to a control group that received st and ard advice regarding physical activity . & OV0312;o2peak increased more with aerobic interval training than moderate continuous training ( 46 % versus 14 % , P<0.001 ) and was associated with reverse LV remodeling . LV end-diastolic and end-systolic volumes declined with aerobic interval training only , by 18 % and 25 % , respectively ; LV ejection fraction increased 35 % , and pro-brain natriuretic peptide decreased 40 % . Improvement in brachial artery flow-mediated dilation ( endothelial function ) was greater with aerobic interval training , and mitochondrial function in lateral vastus muscle increased with aerobic interval training only . The MacNew global score for quality of life in cardiovascular disease increased in both exercise groups . No changes occurred in the control group . Conclusions — Exercise intensity was an important factor for reversing LV remodeling and improving aerobic capacity , endothelial function , and quality of life in patients with postinfa rct ion heart failure . These findings may have important implication s for exercise training in rehabilitation programs and future studies Low-volume sprint interval training ( SIT ) , or repeated sessions of brief , intense intermittent exercise , elicits metabolic adaptations that resemble traditional high-volume endurance training ( ET ) . The effects of these different forms of exercise training on vascular structure and function remain largely unexplored . To test the hypothesis that SIT and ET would similarly improve peripheral artery distensibility and endothelial function and central artery distensibility , we recruited 20 healthy untrained subjects ( age : 23.3 + /- 2.8 yr ) and had them perform 6 wk of SIT or ET ( n = 5 men and 5 women per group ) . The SIT group completed four to six 30-s " all-out " Wingate tests separated by 4.5 min of recovery 3 days/wk . The ET group completed 40 - 60 min of cycling at 65 % of their peak oxygen uptake ( Vo2peak ) 5 days/wk . Popliteal endothelial function , both relative and normalized to shear stimulus , was improved after training in both groups ( main effect for time , P < 0.05 ) . Carotid artery distensibility was not statistically altered by training ( P = 0.29 ) in either group ; however , popliteal artery distensibility was improved in both groups to the same degree ( main effect , P < 0.05 ) . We conclude that SIT is a time-efficient strategy to elicit improvements in peripheral vascular structure and function that are comparable to ET . However , alterations in central artery distensibility may require a longer training stimuli and /or greater initial vascular stiffness than observed in this group of healthy subjects In this large multicenter trial , we aim ed to assess the effect of aerobic exercise training in stable coronary artery disease ( CAD ) patients on cellular markers of endothelial integrity and to examine their relation with improvement of endothelial function .  Two-hundred CAD patients ( left ventricular ejection fraction > 40 % , 90 % male , mean age 58.4 ± 9.1 yr ) were r and omized on a 1:1 base to a supervised 12-wk rehabilitation program of either aerobic interval training or aerobic continuous training on a bicycle . At baseline and after 12 wk , numbers of circulating CD34(+)/KDR(+)/CD45dim endothelial progenitor cells ( EPCs ) , CD31(+)/CD3(+)/CXCR4(+ ) angiogenic T cells , and CD31(+)/CD42b(- ) endothelial microparticles ( EMPs ) were analyzed by flow cytometry . Endothelial function was assessed by flow-mediated dilation ( FMD ) of the brachial artery . After 12 wk of aerobic interval training or aerobic continuous  training , numbers of circulating EPCs , angiogenic T cells , and EMPs were comparable with baseline levels . Whereas improvement in peak oxygen consumption was correlated to improvement in FMD ( Pearson r = 0.17 , P = 0.035 ) , a direct correlation of baseline or posttraining EPCs , angiogenic T cells , and EMP levels with FMD was absent . Baseline EMPs related inversely to the magnitude of the increases in peak oxygen consumption ( Spearman rho = -0.245 , P = 0.027 ) and FMD ( Spearman rho = -0.374 , P = 0.001 ) following exercise training . In conclusion , endothelial function improvement in response to exercise training in patients with CAD did not relate to altered levels of EPCs and angiogenic T cells and /or a diminished shedding of EMPs into the circulation . EMP flow cytometry may be predictive of the increase in aerobic capacity and endothelial function Background —In stable coronary artery disease ( CAD ) , exercise training has well-documented positive effects on arterial endothelial function . NO derived from endothelial NO synthase ( eNOS ) is regarded as a protective factor against atherosclerosis . The aim of the present study was to investigate the effects of exercise training on the endothelial function in relation to the expression of eNOS and Akt-dependent eNOS phosphorylation in the left internal mammary artery ( LIMA ) of patients with stable CAD . Methods and Results —In 17 training patients ( T ) and 18 control patients ( C ) , endothelium-dependent vasodilation and average peak flow velocity ( APV ) in response to  acetylcholine  were measured invasively at study beginning and after 4 weeks in the LIMA . In LIMA tissue sample d during bypass surgery , eNOS expression and content of pospho-eNOS-Ser1177 , Akt , and phospho-Akt were determined by Western blot and quantitative reverse transcriptase – polymerase chain reaction . After exercise training , LIMA APV in response to acetylcholine was increased by 56±8 % ( from + 48±8 % at beginning to + 104±11 % after 4 weeks , P < 0.001 ) . Patients in T had a 2-fold higher eNOS protein expression ( T 1.0±0.7 versus C 0.5±0.3 arbitrary units , P < 0.05 ) and 4-fold higher eNOS Ser1177-phosphorylation levels in LIMA-endothelium ( 1.2±0.9 versus 0.3±0.2 arbitrary units , P < 0.01 ) . A linear correlation was confirmed between Akt phosphorylation and phospho-eNOS levels ( R = 0.80 , P < 0.05 ) and between phospho-eNOS and & Dgr ; APV ( R = 0.59 , P < 0.05 ) . Conclusions —Exercise training in stable CAD leads to an improved agonist-mediated endothelium-dependent vasodilatory capacity . The change in acetylcholine-induced vasodilatation was closely related to a shear stress – induced/Akt-dependent phosphorylation of eNOS on Ser1177 Background Despite the cardiovascular etiology of stroke , exercise and risk factor modification programs akin to cardiac rehabilitation ( CR ) are not available . This study aim ed to establish the feasibility of adapting a CR model for individuals with mild to moderate stroke disability . A secondary objective was to determine the program 's effects on aerobic and walking capacity , and stroke risk factors . Methods A repeated measures design was used with a 3-month baseline period and 6-month adapted CR intervention  ( n = 43 , mean ± SD age 65 ± 12 years , 30 ± 28 months post stroke ) . Feasibility was determined by the number of participants who completed the study , occurrence of adverse events and frequency , duration and intensity of exercise performed . To determine effectiveness of the program , outcomes measured included aerobic capacity ( VO2peak , ventilatory threshold ) , 6-Minute Walk Test ( 6MWT ) distance , and risk factors . Descriptive statistics characterized the classes attended and number and intensity of exercise sessions . Paired t-tests , one-factor repeated measures analyses of variance contrasts and chi-square analyses were used to compare changes over time . Results Two participants withdrew during the baseline period . Of the remaining 41 participants who commenced the program , 38 ( 93 % ) completed all aspects . No serious adverse effects occurred . Post-intervention , VO2peak improved relative to the stable baseline period ( P = 0.046 ) and the increase in ventilatory threshold approached significance ( P = 0.062 ) . Conclusions CR is feasible after stroke and may be adapted to accommo date for those with a range of post-stroke disability . It is effective in increasing aerobic capacity . CR may be an untapped opportunity for stroke survivors to access programs of exercise and risk factor modification to lower future event risk . Trial registration Clinical Trials.gov registration number : Objective : To evaluate risk factor reduction and health-related quality of life following a 10-week cardiac rehabilitation programme in non-acute ischaemic stroke subjects . Design : Single-blinded r and omized control trial . Setting : Outpatient rehabilitation . Subjects : Forty- 
    Output:
    
Conclusion : High-intensity training is promising as a time-efficient exercise strategy in cardiovascular rehabilitation , but data on endothelial effects in cerebrovascular rehabilitation are warranted .