***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: This pilot study examines the effects of Tai Chi on balance , gait and mobility in people with Parkinson disease ( PD ) . Thirty-three people with PD were r and omly assigned to either a Tai Chi group or a control group . The Tai Chi group participated in 20 1-h long training sessions completed within 10 - 13 weeks ; whereas , the control group had two testing sessions between 10 and 13 weeks apart without interposed training . The Tai Chi group improved more than the control group on the Berg Balance Scale , UPDRS , Timed Up and Go , t and em stance test , six-minute walk , and backward walking . Neither group improved in forward walking or the one leg stance test . All Tai Chi participants reported satisfaction with the program and improvements in well-being .  Tai Chi appears to be an appropriate , safe and effective form of exercise for some individuals with mild-moderately severe PD Freezing is a disabling symptom in patients with Parkinson 's disease . We investigated the effectiveness of a new rehabilitation strategy based on treadmill training associated with auditory and visual cues .  Forty Parkinsonian patients with freezing were r and omly assigned to two groups : Group 1 underwent a rehabilitation program based on treadmill training associated with auditory and visual cues , while Group 2 followed a rehabilitation protocol using cues and not associated with treadmill . Functional evaluation was based on the Unified Parkinson 's Disease Rating Scale Motor Section ( UPDRS III ) , Freezing of Gait Question naire ( FOGQ ) , 6-minute walking test ( 6MWT ) , gait speed , and stride cycle . Patients in both the groups had significant improvements in all variables considered by the end of the rehabilitation program ( all P = 0.0001 ) . Patients treated with the protocol including treadmill , had more improvement than patients in Group 2 in most functional indicators ( P = 0.007 , P = 0.0004 , P = 0.0126 , and P = 0.0263 for FOGQ , 6MWT , gait speed , stride cycle , respectively ) . The most striking result was obtained for 6MWT , with a mean increase of 130 m in Group 1 compared with 57 m in Group 2 . Our results suggest that treadmill training associated with auditory and visual cues might give better results than more conventional treatments . Treadmill training probably acts as a supplementary external cue AIM To investigate the effects of an aerobic training in subjects with Parkinson 's disease ( PD ) as compared to a medical Chinese exercise ( Qigong ) . METHODS DESIGN r and omized controlled trial with a cross over design . SETTING PD out- patients referred to a Neurorehabilitation facility for the management of motor disability . SUBJECTS 26 PD patients in Hoehn and Yahr stage II to III under stable medication were r and omly allocated to either Group AT1+QG2 ( receiving 20 aerobic training sessions followed by 20 ' ' Qigong ' ' group sessions with 2 month interval between the interventions ) , or Group QG1+AT2 ( performing the same treatments with an inverted sequence ) . MAIN OUTCOME MEASURES clinical effects of treatment were sought through the Unified Parkinson 's Disease Rating Scale ( UPDRS ) , Brown 's Disability Scale ( B'DS ) , six-Minute Walking Test ( 6MWT ) , Borg scale for breathlessness , Beck Depression Inventory ( BDI ) and Parkinson 's Disease Question naire-39 items ( PDQ-39 ) . A spirometry test and maximum cardiopulmonary exercise test ( CPET ) were also performed to determine the pulmonary function , the metabolic and cardio-respiratory requests at rest and under exercise . All measures were taken immediately before and at the completion of each treatment phase . RESULTS The statistical analysis focusing on the evolution of motor disability and quality of life revealed a significant interaction effect between group and time for the 6MWT ( time x group effect : F : 5.4 P=0.002 ) and the Borg scale ( time x group effect : F : 4.2 P=0.009 ) . Post hoc analysis showed a significant increase in 6MWT and a larger decrease in Borg score after aerobic training within each subgroup , whereas no significant changes were observed during Qigong . No significant changes over time were detected through the analysis of UPDRS , B'DS , BDI and PDQ-39 scores . The analysis of cardiorespiratory parameters showed significant interaction effects between group and time for the Double Productpeak ( time x group effect : F : 7.7 P=0.0003 ) , the VO(2peak ) ( time x group effect : F : 4.8 P=0.007 ) , and the VO(2)/kg ratio ( time x group effect : F : 4.3 P=0.009 ) , owing to their decrease after aerobic training to an extent that was never observed after Qigong treatment . CONCLUSIONS Aerobic training exerts a significant impact on the ability of moderately disabled PD patients to cope with exercise , although it does not improve their self-sufficiency and quality of life Objective : To detect the effectiveness of incremental speed-dependent treadmill training on postural instability , dynamic balance and fear of falling in patients with idiopathic Parkinson 's disease . Design : R and omized controlled trial . Setting : Ankara Education and Research Hospital , 2nd PM&R Clinic , Cardiopulmonary Rehabilitation Unit . Subjects : Fifty-four patients with idiopathic Parkinson 's disease in stage 2 or 3 of the Hoehn Yahr staging entered , and 31 patients ( 21 training , 10 control ) had outcome data . Interventions : Postural instability of patients with Parkinson 's disease was assessed using the motor component of the Unified Parkinson 's Disease Rating Scale ( UPDRS ) , Berg Balance Test , Dynamic Gait Index and Falls Efficacy Scale .  Twenty-one patients with Parkinson 's disease participated in an eight-week exercise programme using incremental speed-dependent treadmill training . Before and after the training programme , balance , gait , fear of falling and walking distance and speed on treadmill were assessed in both Parkinson 's disease groups . Main measures : Walking distance and speed on treadmill , UPDRS , Berg Balance Test , Dynamic Gait Index and Falls Efficacy Scale . Results : Initial total walking distance of the training group on treadmill was 266.45 ± 82.14 m and this was progressively increased to 726.36 ± 93.1 m after 16 training session ( P < 0.001 ) . Tolerated maximum speed of the training group on treadmill at baseline was 1.9 ± 0.75 km/h and improved to 2.61 ± 0.77 km/h ( P < 0.001 ) . Berg Balance Test , Dynamic Gait Index and Falls Efficacy Scale scores of the training group were improved significantly after the training programme ( P < 0.01 ) . There was no significant improvement in any of the outcome measurements in the control group ( P > 0.05 ) . Conclusions : Specific exercise programmes using incremental speed-dependent treadmill training may improve mobility , reduce postural instability and fear of falling in patients with Parkinson 's disease OBJECTIVE To compare the efficacy of treadmill exercises and stretching and resistance exercises in improving gait speed , strength , and fitness for patients with Parkinson disease . DESIGN A comparative , prospect i ve , r and omized , single-blinded clinical trial of 3 types of physical exercise . SETTING The Parkinson 's Disease and Movement Disorders Center at the University of Maryl and and the Baltimore Veterans Affairs Medical Center , Geriatric Research Education and Clinical Center . PATIENTS A total of 67 patients with Parkinson disease who had gait impairment were r and omly assigned to 1 of 3 arms of the trial . INTERVENTIONS ; ( 1 ) A higher-intensity treadmill exercise ( 30 minutes at 70%-80 % of heart rate reserve ) , ( 2 ) a lower-intensity treadmill exercise ( 50 minutes at 40%-50 % of heart rate reserve ) , and ( 3 ) stretching and resistance exercises ( 2 sets of 10 repetitions on each leg on 3 resistance machines [ leg press , leg extension , and curl ] ) . These exercises were performed 3 times a week for 3 months . MAIN OUTCOME MEASURES The primary outcome measures were gait speed ( 6-minute walk ) , cardiovascular fitness ( peak oxygen consumption per unit time [ $ $ VO2 ] , and muscle strength ( 1-repetition maximum strength ) . RESULTS All 3 types of physical exercise improved distance on the 6-minute walk : lower-intensity treadmill exercise  ( 12 % increase ; P=.001 ) ,  stretching and resistance exercises  ( 9 % increase ; P<.02 ) , and higher-intensity treadmill exercise  ( 6 % increase ; P=.07 ) , with no between-group differences . Both treadmill exercises improved peak $ $ VO2 ( 7%-8 % increase ; P<.05 ) more than did the stretching and resistance exercises . Only stretching and resistance improved muscle strength ( 16 % increase ; P<.001 ) . CONCLUSIONS The effects of exercise were seen across all 3 exercise groups . The lower-intensity treadmill exercise result ed in the greatest improvement in gait speed . Both the higher- and lower-intensity treadmill exercises improved cardiovascular fitness . Only the stretching and resistance exercises improved muscle strength . Therefore , exercise can improve gait speed , muscle strength , and fitness for patients with Parkinson disease . The combination of treadmill and resistance exercises may result in greater benefit and requires further investigation BACKGROUND Patients with Parkinson 's disease have substantially impaired balance , leading to diminished functional ability and an increased risk of falling . Although exercise is routinely encouraged by health care providers , few programs have been proven effective . METHODS We conducted a r and omized , controlled trial to determine whether a tailored tai chi program could improve postural control in patients with idiopathic Parkinson 's disease . We r and omly assigned 195 patients with stage 1 to 4 disease on the Hoehn and Yahr staging scale ( which ranges from 1 to 5 , with higher stages indicating more severe disease ) to one of three groups : tai chi , resistance training , or stretching . The patients participated in 60-minute exercise sessions twice weekly for 24 weeks . The primary outcomes were changes from baseline in the limits-of-stability test ( maximum excursion and directional control ; range , 0 to 100 % ) . Secondary outcomes included measures of gait and strength , scores on functional-reach and timed up- and -go tests , motor scores on the Unified Parkinson 's Disease Rating Scale , and number of falls . RESULTS The tai chi group performed consistently better than the resistance-training and stretching groups in maximum excursion ( between-group difference in the change from baseline , 5.55 percentage points ; 95 % confidence interval [ CI ] , 1.12 to 9.97 ; and 11.98 percentage points ; 95 % CI , 7.21 to 16.74 , respectively ) and in directional control ( 10.45 percentage points ; 95 % CI , 3.89 to 17.00 ; and 11.38 percentage points ; 95 % CI , 5.50 to 17.27 , respectively ) . The tai chi group also performed better than the stretching group in all secondary outcomes and outperformed the resistance-training group in stride length and functional reach .  Tai chi lowered the incidence of falls as compared with stretching but not as compared with resistance training . The effects of tai chi training were maintained at 3 months after the intervention . No serious adverse events were observed . CONCLUSIONS Tai chi training appears to reduce balance impairments in patients with mild-to-moderate Parkinson 's disease , with additional benefits of improved functional capacity and reduced falls . ( Funded by the National Institute of Neurological Disorders and Stroke ; Clinical Trials.gov number , NCT00611481 . ) Objective : To investigate the feasibility and effectiveness of six weeks of home-based treadmill training in people with mild Parkinson ’s disease . Design : Pilot r and omized controlled trial of a six-week intervention followed by a further six weeks follow-up . Setting : Home-based treadmill training with outcome measures taken at a hospital clinic . Participants : Twenty cognitively intact participants with mild Parkinson ’s disease and gait disturbance . Two participants from the treadmill training group and one from the control group dropped out . Interventions : The treadmill training group undertook a semi-supervised home-based programme of treadmill walking for 20–40 minutes , four times a week for six weeks . The control group received usual care . Main outcome measures : The feasibility of the intervention was assessed by recording exercise adherence and acceptability , exercise intensity , fatigue , muscle soreness and adverse events . The primary outcome measure of efficacy was walking capacity ( 6-minute walk test distance ) . Results : Home-based treadmill training was feasible , acceptable and safe with participants completing 78 % ( SD 36 ) of the prescribed training sessions . The treadmill training group did not improve their walking capacity compared to the control group . The treadmill training group showed a greater improvement than the control group in fatigue at post test ( P = 0.04 ) and in quality of life at six weeks follow-up testing ( P = 0.02 ) . Conclusions : Semi-supervised home-based treadmill training is a feasible and safe form of exercise for cognitively intact people with mild Parkinson ’s disease . Further investigation regarding the effectiveness of home-based treadmill training is warranted INTRODUCTION Frequent falls and risk of injury are evident in individuals with Parkinson 's disease ( PD ) as the disease progresses . There have been no reports of any interventions that reduce the incidence of falls in idiopathic PD . PURPOSE Assess the benefit 
    Output:
    
And there was no valid evidence on follow-up effects of aerobic exercise for PD .
CONCLUSION Aerobic exercise showed immediate beneficial effects in improving motor action , balance , and gait in patients with PD .