***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 
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    Input: OBJECTIVE : To investigate the effect of a supervised home-based exercise program on the recurrence and severity of gestational diabetes mellitus ( GDM )  together with other aspects of maternal health and obstetric and neonatal outcomes . METHODS : This r and omized controlled trial allocated women with a history of GDM to an  exercise intervention ( 14-week supervised home-based stationary cycling program ) or to a control group ( st and ard care ) at 13±1 weeks of gestation . The primary outcome was a diagnosis of GDM . Secondary outcomes included maternal fitness , psychological well-being , and obstetric and neonatal outcomes . A sample size of 180 ( 90 in each group ) was required to attain 80 % power to detect a 40 % reduction in the incidence of GDM . RESULTS : Between June 2011 and July 2014 , 205 women provided written consent and completed baseline assessment s. Of these , 33 ( 16 % ) were subsequently excluded as a result of an elevated baseline oral glucose tolerance test ( OGTT ) , leaving 172 r and omized to exercise ( n=85 ) or control ( n=87 ) . Three women miscarried before the assessment of outcome measures ( control=2 ; exercise=1 ) . All remaining women completed the postintervention OGTT . The recurrence rate of GDM was similar between groups ( control 40 % [ n=34 ] ; exercise 40.5 % [ n=34 ] ; P=.95 ) and the severity of GDM at diagnosis was unaffected by the exercise program with similar glucose and insulin responses to the OGTT ( glucose 2 hours post-OGTT 7.7±1.5 compared with 7.6±1.6 mmol/L ; P>.05 ) . Maternal fitness was improved by the exercise program ( P<.01 ) and psychological distress was reduced ( P=.02 ) . There were no differences in obstetric and neonatal outcomes between groups ( P>.05 ) . CONCLUSION : Supervised home-based exercise started at 14 weeks of gestation did not prevent the recurrence of GDM ; however , it was associated with important benefits for maternal fitness and psychological well-being . CLINICAL TRIAL REGISTRATION : Clinical Trials.gov , https:// clinical trials.gov , NCT01283854 Recent guidelines on exercise for weight loss and weight maintenance include resistance training as part of the exercise prescription . Yet few studies have compared the effects of similar amounts of aerobic and resistance training on body mass and fat mass in overweight adults . STRRIDE AT/RT , a r and omized trial , compared aerobic training , resistance training , and a combination of the two to determine the optimal mode of exercise for obesity reduction . Participants were 119 sedentary , overweight or obese adults who were r and omized to one of three 8-mo exercise protocol s : 1 ) RT : resistance training , 2 ) AT : aerobic training , and 3 ) AT/RT : aerobic and resistance training ( combination of AT and RT ) . Primary outcomes included total body mass , fat mass , and lean body mass . The AT and AT/RT groups reduced total body mass and fat mass more than RT ( P < 0.05 ) , but they were not different from each other . RT and AT/RT increased lean body mass more than AT ( P < 0.05 ) . While requiring double the time commitment , a program of combined AT and RT did not result in significantly more fat mass or body mass reductions over AT alone . Balancing time commitments against health benefits , it appears that AT is the optimal mode of exercise for reducing fat mass and body mass , while a program including RT is needed for increasing lean mass in middle-aged , overweight/obese individuals PURPOSE The purpose of the study was to determine the effect of a home-based cycling program for women with a recent diagnosis of gestational diabetes mellitus ( GDM ) on aerobic fitness , weight gain , self-reported mobility , attitude , and intentions toward maternal exercise , and obstetric and neonatal outcomes . METHODS Forty women ( mean ± SD , 28.8 ± 0.9-wk gestation ) were r and omized to either a supervised , home-based exercise program , combining continuous steady-state and interval cycling at various intensities , in combination with unsupervised moderate intensity aerobic activity and conventional diabetic management ( EX ; n = 20 ) or to conventional management alone ( CON ; n = 20 ) . The program began following diagnosis until week 34 of pregnancy ( mean ± SD duration of training , 6 ± 1 wk ) . RESULTS Mean compliance to the training program was 96 % . Maternal aerobic fitness , and attitude and intentions toward exercise were improved in response to the home-based exercise intervention compared with CON ( P < 0.05 ) . No differences were observed between the groups with respect to maternal weight gain or obstetric and neonatal outcomes ( P > 0.05 ) . CONCLUSION A home-based exercise program of 6 ± 1 wk in duration commenced after diagnosis of GDM can improve aerobic fitness and attitude and intentions toward exercise , with no adverse effect on maternal and neonatal pregnancy outcomes BACKGROUND Exercise may influence glucose metabolism during pregnancy . We examined the effect of exercise intensity and duration on capillary glucose responses in pregnant women at low and high risk for gestational diabetes mellitus ( GDM ) who followed a modified GDM meal plan . METHODS R and omization occurred at study entry ( 16 - 20 weeks ' gestation ) into a low-intensity [ 30 % heart rate reserve , low risk-30%I , n = 12 ; high risk-30%I , n = 11 ] or vigorous-intensity ( 70 % heart rate reserve , low risk-70%I , n = 12 ; R-70%I , n = 11 ) exercise program with similar nutritional control . Exercise consisted of walking three to four times a week , gradually increasing time from 25 to 40 min/session . Free-living capillary glucose concentrations were measured once a week pre-exercise and post-exercise . RESULTS Capillary glucose responses to exercise were strongly influenced by an interaction between GDM risk , exercise duration and exercise intensity ( p = 0.006 ) . Decreases in glucose concentrations were observed after 25 ( 4 ± 13 % ) , 35 ( 21 ± 12 % ) and 40 min ( 15 ± 18 % ) of walking in high risk-30%I women , with the most noticeable decline after 35 and 40 min . In the high risk-70%I , glucose concentrations decreased significantly only after 25 ( 22 ± 14 % ) and 35 min ( 7 ± 23 % ) and increasing the exercise time attenuated glucose concentrations decline . In low risk women , regardless of exercise intensity and duration , decreases in glucose concentrations were significant and similar . CONCLUSION To achieve the best decline in glucose concentrations , pregnant women who follow a modified GDM meal plan should walk for 25 min/session at vigorous intensity or for 35 - 40 min/session at low intensity if they are at risk for GDM and for at least 25 min at either low or vigorous intensity if they are at low risk for GDM Objective To examine the effectiveness of a partially homebased , moderate-intensity aerobic exercise program for women with gestational diabetes . Methods This was a r and omized experimental design . Thirty-three women with gestational diabetes were r and omly assigned to the exercise or the no-exercise group . Subjects underwent hemoglobin A1C assay and submaximal cycle ergometer fitness tests at baseline and at study conclusion . Subjects kept diaries of home fasting and 2-hour postpr and ial blood glucose determinations . Exercise subjects were asked to exercise for 30 minutes three to four times weekly at 70 % of estimated maximal heart rate for the weeks of study participation . Two exercise sessions weekly were supervised by the investigator , and two were unsupervised at home .  Control-group  subjects were asked to maintain their current activity level . Results Daily fasting and postpr and ial blood glucose levels , hemoglobin A1C , incidence of exogenous insulin therapy , and incidence of newborn hypoglycemia were not different between the groups . There was a training effect in the exercise group ( P = .005 ) but not in the control group ( P = .25 ) . A significant decline in daily grams of carbohydrate consumed was observed in the control group ( P = .03 ) , but not in the exercise group ( P = .97 ) . No complications were found in the subjects who exercised . Conclusions A partially home-based exercise program did not reduce blood glucose levels , but did result in a modest increase in cardiorespiratory fitness . The intervention appeared safe OBJECTIVE Available insulin sensitivity ( IS ) methods based on the oral glucose tolerance test ( OGTT ) are empirical . We used a glucose-insulin model to derive an OGTT-based IS ( oral glucose insulin sensitivity [ OGIS ] ) index , which predicts glucose clearance in a glucose clamp . We vali date d OGIS against clamp data . RESEARCH DESIGN AND METHODS OGIS requires glucose and insulin concentrations from a 75-g OGTT at 0 , 2 , and 3 h ( 3-h OGTT ) or at 0 , 1.5 , and 2 h ( 2-h OGTT ) . The formula includes six constants optimized to match the clamp results . For this purpose , 15 lean nondiabetic subjects ( BMI < 25 kg/m2 ) , 38 obese nondiabetic subjects ( BMI > 25 kg/m2 ) , and 38 subjects with type 2 diabetes r and omly underwent an OGTT and a 120 mU x min(-1 ) x m(-2 ) insulin infusion euglycemic clamp . Glucose clearance ( Cl CLAMP )  , calculated as the ratio of  glucose infusion to concentration during the last hour of the clamp , was compared with OGIS . OGIS was also tested on an independent group of 13 subjects with impaired glucose tolerance ( IGT ) . RESULTS OGIS and Cl CLAMP  were correlated in the whole group ( R = 0.77 , P < 0.0001 ) , in the subgroups ( lean : R = 0.59 ; obese : R = 0.73 ; type 2 diabetes : R = 0.49 ; P < 0.02 ) , and in the independent IGT group ( R = 0.65 , P < 0.02 ) . Reproducibility of OGIS and Cl CLAMP  were similar ( coefficients of variation : OGIS 7.1 % , Cl CLAMP 6.4 % ) . OGIS was as effective as  Cl CLAMP  in discriminating between groups ( for OGIS , lean vs. obese : 440 + /- 16 vs. 362 + /- 11 ml x min(-1 ) x m(-2 ) , p < 0.001 ; lean vs. type 2 diabetes : 440 + /- 16 vs. 239 + /- 7 , P < 0.0001 ; obese vs. type 2 diabetes : 362 + /- 11 vs. 239 + /- 7 , P < 0.0001 ; results were similar for Cl CLAMP ) . The relationships between IS and BMI , fasting plasma insulin , and insulin secretion ( calculated from the OGTT insulin concentration ) were examined . OGIS yielded results similar to Cl CLAMP and fully consistent with established physiological principles . The performance of the index for the 3-h and 2-h OGTT was similar . CONCLUSIONS OGIS is an index of IS in good agreement with the clamp . Because of its simplicity ( only three blood sample s required ) , this method has potential use for clinical investigation including large-scale epidemiological studies AIM The significant deterioration of insulin sensitivity and glucose tolerance during pregnancy can have serious health implication s for both the pregnant woman and her baby . Although it is well established that regular exercise benefits insulin sensitivity in the nonpregnant population , the effect on glucose tolerance in obese pregnant women is not known . The purpose of this study was to investigate the effect of a supervised 10-week , home-based , exercise programme , beginning at week 18 of gestation , on glucose tolerance and aerobic fitness in previously sedentary obese women . METHODS Twelve sedentary obese women were r and omized into an exercise ( EX ; n=6 ) or control ( CON ; n=6 ) group at 18 weeks of gestation . Those r and omized to EX engaged in 10 weeks of supervised home-based exercise ( three sessions a week of stationary cycling ) , while those in the CON group maintained their usual daily activity . Their glucose and insulin responses to an oral glucose tolerance test ( OGTT ) , as well as their aerobic fitness , were assessed both pre- and postintervention . RESULTS Reduced glucose tolerance in the CON , but not EX , group was indicated by a tendency postintervention towards higher blood glucose levels at 1h of the OGTT ( P=0.072 ) . Furthermore , at 2h of the postintervention OGTT , blood glucose tended to remain elevated from baseline in the CON ( P=0.077 ) . There was also a trend towards increased fitness in the EX ( P=0.064 ) , but not the CON group . CONCLUSION Regular aerobic exercise begun during pre 
    Output:
    
The interventions showed consistently that requirements of insulin therapy , dosage , and latency to administration were improved in the exercise groups .
Less consistent results were observed for capillary blood glucose measurements ; however , both modalities and combination of modalities were effective at improving blood glucose control in already diagnosed patients and pregnant women with obesity .
Conclusion Exercising three times per week for 40 - 60 min at 65 - 75 % age-predicted heart rate maximum using cycling , walking or circuit training as a modality improved glycaemic control in GDM patients and reduced incidence of GDM in pregnant women with obesity .