***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: Aims /hypothesisCardiac disease remains the leading cause of mortality in type 2 diabetes , yet few strategies to target cardiac dysfunction have been developed . This r and omised controlled trial aim ed to investigate high intensity intermittent training ( HIIT ) as a potential therapy to improve cardiac structure and function in type 2 diabetes . The impact of HIIT on liver fat and metabolic control was also investigated . Methods Using an online r and om allocation sequence , 28 patients with type 2 diabetes ( metformin and diet controlled ) were r and omised to 12 weeks of HIIT ( n = 14 ) or st and ard care ( n = 14 ) . Cardiac structure and function were measured by 3.0 T MRI and tagging . Liver fat was determined by 1H-magnetic resonance spectroscopy and glucose control by an OGTT . MRI analysis was performed by an observer blinded to group allocation . All study procedures took place in Newcastle upon Tyne , UK . Results Five patients did not complete the study and were therefore excluded from analysis : this left 12 HIIT and 11 control patients for the intention-to-treat analysis . Compared with controls , HIIT  improved cardiac structure ( left ventricular wall mass 104 ± 17 g to 116 ± 20 g vs 107 ± 25 g to 105 ± 25 g , p < 0.05 ) and systolic function ( stroke volume 76 ± 16 ml to 87 ± 19 ml vs 79 ± 14 ml to 75 ± 15 ml , p < 0.01 ) . Early diastolic filling rates increased ( 241 ± 84 ml/s to 299 ± 89 ml/s vs 250 ± 44 ml/s to 251 ± 47 ml/s , p < 0.05 ) and peak torsion decreased ( 8.1 ± 1.8 ° to 6.9 ± 1.6 ° vs 7.1 ± 2.2 ° to 7.6 ± 1.9 ° , p < 0.05 ) in the treatment group . Following HIIT , there was a 39 % relative reduction in liver fat ( p < 0.05 ) and a reduction in HbA1c ( 7.1 ± 1.0 % [ 54.5 mmol/mol ] to 6.8 ± 0.9 % [ 51.3 mmol/mol ] vs 7.2 ± 0.5 % [ 54.9 mmol/mol ] to 7.4 ± 0.7 % [ 57.0 mmol/mol ] , p < 0.05 ) . Changes in liver fat correlated with changes in HbA1c ( r = 0.70 , p < 0.000 ) and 2 h glucose ( r = 0.57 , p < 0.004 ) . No adverse events were recorded . Conclusions /interpretationThis is the first study to demonstrate improvements in cardiac structure and function , along with the greatest reduction in liver fat , to be recorded following an exercise intervention in type 2 diabetes . HIIT should be considered by clinical care teams as a therapy to improve cardiometabolic risk in patients with type 2 diabetes . Trial registration : www.is rct n.com 78698481 Funding : Medical Research Council OBJECTIVE To evaluate the feasibility of free-living walking training in type 2 diabetic patients and to investigate the effects of interval-walking training versus continuous-walking training upon physical fitness , body composition , and glycemic control . RESEARCH DESIGN AND METHODS Subjects with type 2 diabetes were r and omized to a control ( n = 8) , continuous-walking ( n = 12 ) , or interval-walking group ( n = 12 ) . Training groups were prescribed five sessions per week ( 60 min/session ) and were controlled with an accelerometer and a heart-rate monitor . Continuous walkers performed all training at moderate intensity , whereas interval walkers alternated 3-min repetitions at low and high intensity . Before and after the 4-month intervention , the following variables were measured : VO2max , body composition , and glycemic control ( fasting glucose , HbA1c , oral glucose tolerance test , and continuous glucose monitoring [ CGM ] ) . RESULTS Training adherence was high ( 89 ± 4 % ) , and training energy expenditure and mean intensity were comparable . VO2max increased 16.1 ± 3.7 % in the interval-walking group ( P < 0.05 ) , whereas no changes were observed in the continuous-walking or control group . Body mass and adiposity ( fat mass and visceral fat ) decreased in the interval-walking group only ( P < 0.05 ) . Glycemic control ( elevated mean CGM glucose levels and increased fasting insulin ) worsened in the control group ( P < 0.05 ) , whereas mean ( P = 0.05 ) and maximum ( P < 0.05 ) CGM glucose levels decreased in the interval-walking group . The continuous walkers showed no changes in glycemic control . CONCLUSIONS Free-living walking training is feasible in type 2 diabetic patients . Continuous walking offsets the deterioration in glycemia seen in the control group , and interval walking is superior to energy expenditure – matched continuous walking for improving physical fitness , body composition , and glycemic control 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 Importance It is unclear whether a lifestyle intervention can maintain glycemic control in patients with type 2 diabetes . Objective To test whether an intensive lifestyle intervention results in equivalent glycemic control compared with st and ard care and , secondarily , leads to a reduction in glucose-lowering medication in participants with type 2 diabetes . Design , Setting , and Participants R and omized , assessor-blinded , single-center study within Region Zeal and and the Capital Region of Denmark ( April 2015-August 2016 ) . Ninety-eight adult participants with non – insulin-dependent type 2 diabetes who were diagnosed for less than 10 years were included . Participants were r and omly assigned ( 2:1 ; stratified by sex ) to the lifestyle group ( n = 64 ) or the st and ard care group ( n = 34 ) . Interventions All participants received st and ard care with individual counseling and st and ardized , blinded , target-driven medical therapy . Additionally , the lifestyle intervention included 5 to 6 weekly aerobic training sessions ( duration 30 - 60 minutes ) , of which 2 to 3 sessions were combined with resistance training . The lifestyle participants received dietary plans aim ing for a body mass index of 25 or less . Participants were followed up for 12 months . Main Outcomes and Measures Primary outcome was change in hemoglobin A1c ( HbA1c ) from baseline to 12-month follow-up , and equivalence was prespecified by a CI margin of ±0.4 % based on the intention-to-treat population . Superiority analysis was performed on the secondary outcome reductions in glucose-lowering medication . Results Among 98 r and omized participants ( mean age , 54.6 years [ SD , 8.9 ] ; women , 47 [ 48 % ] ; mean baseline HbA1c , 6.7 % ) , 93 participants completed the trial . From baseline to 12-month follow-up , the mean HbA1c level changed from 6.65 % to 6.34 % in the lifestyle group and from 6.74 % to 6.66 % in the st and ard care group ( mean between-group difference in change of −0.26 % [ 95 % CI , −0.52 % to −0.01 % ] ) , not meeting the criteria for equivalence ( P = .15 ) . Reduction in glucose-lowering medications occurred in 47 participants ( 73.5 % ) in the lifestyle group and 9 participants ( 26.4 % ) in the st and ard care group ( difference , 47.1 percentage points [ 95 % CI , 28.6 - 65.3 ] ) . There were 32 adverse events ( most commonly musculoskeletal pain or discomfort and mild hypoglycemia ) in the lifestyle group and 5 in the st and ard care group . Conclusions and Relevance Among adults with type 2 diabetes diagnosed for less than 10 years , a lifestyle intervention compared with st and ard care result ed in a change in glycemic control that did not reach the criterion for equivalence , but was in a direction consistent with benefit . Further research is needed to assess superiority , as well as generalizability and durability of findings . Trial Registration clinical trials.gov Identifier : Purpose It remains to be established how high-intensity aerobic interval training ( HAIT ) affects risk factors associated with type 2 diabetes ( TD2 ) . This study investigated effects of HAIT on maximal oxygen uptake ( VO2max ) , glycated Hemoglobin type A1C ( HbA1c ) , insulin resistance ( IR ) , fat oxidation ( FatOx ) , body weight ( BW ) , percent body fat ( % BF ) , lactate threshold ( LT ) , blood pressure ( BP ) , and blood lipid profile ( BLP ) among persons with T2D . Results were compared to the effects after a moderate-intensity training ( MIT ) program . Methods Thirty-eight individuals with T2D completed 12 weeks of supervised training . HAIT consisted of 4 × 4 min of walking or running uphill at 85–95 % of maximal heart rate , and MIT consisted of continuous walking at 70–75 % of maximal heart rate . Results A 21 % increase in VO2max ( from 25.6 to 30.9 ml kg−1 min−1 , p < 0.001 ) , and a reduction in HbA1c by −0.58 % points ( from 7.78 to 7.20 % , p < 0.001 ) was found in HAIT . BW and body mass index ( BMI ) was reduced by 1.9 % ( p < 0.01 ) . There was a tendency towards an improved FatOx at 60 % VO2max ( 14 % , p = 0.065 ) . These improvements were significant different from MIT . Both HAIT and MIT  increased velocity at LT , and reduced % BF , waist circumference , hip circumference , and BP , with no significant differences between the two groups . Correlations were found between change in VO2max and change in HbA1c when the two intervention groups were combined ( R = −0.52 , p < 0.01 ) . Conclusion HAIT is an effective exercise strategy to improve aerobic fitness and reduce risk factors associated with T2D Background : Small studies have suggested that high-intensity interval training ( HIIT ) is superior to moderate continuous training ( MCT ) in reversing cardiac remodeling and increasing aerobic capacity in patients with heart failure with reduced ejection fraction . The present multicenter trial compared 12 weeks of supervised interventions of HIIT , MCT , or a recommendation of regular exercise ( RRE ) . Methods : Two hundred sixty-one patients with left ventricular ejection fraction ⩽35 % and New York Heart Association 
    Output:
    
HIIT elicited a significant reduction in BMI , body fat , HbA1c , fasting insulin , and VO2peak in patients with type 2 diabetes .
Conclusions HIIT may induce more positive effects in cardiopulmonary fitness  than MICT in T2D patients