S62 Poster Session II P2.073 Systematic review: effectiveness of physical training on motor performance and fall prevention in cognitively impaired older persons K. Hauer 1° , C. Becker 2 , U. Lindemann 2 , N. Beyer 3 1 Heidelberg, 2 Stuttgart, Germany; 3 Copenhagen, Denmark Background and Aims: No systemtic review had been published on the effectiveness of physical training including cognitively impaired persons only. The aim of the study was to determine whether older cognitively impaired people benefit from physical training with regard to motor performance and/or fall risk reduction and to critically evaluate the methodological approach in identified randomized controlled intervention trials. Methods: Published RCTs from 1966 to 2005 were identified in PubMed, CINAHL, Gerolit and the Cochrane Central Register of Con- trolled Trials according to predefined inclusion criteria and evaluated by two independent reviewers using a modified rating system for RCTs developed by the Cochrane Library. Results: 11 RCTs met the predefined inclusion criteria. There was a large heterogeneity regarding methodology, sample size, type of intervention, study outcomes and analyses. We found conflicting evidence regarding the effect of physical training on motor performance and falls in older people with cognitive impairment. However, a considerable number of the studies had methodological limitations, which hampered the evaluation of the effectiveness of training. Conclusions: The RCTs showed only limited effectiveness of physical training in patients with cognitive impairment. More studies with adequate sample size, sensitive and validated measurements, and higher specificity for the types of intervention targeting subgroups of patients with different degrees of cognitive impairment are required to give evidence based recommendations. P2.074 Interpersonal coordination between two upright standing individuals as determined by finger tip social light touch contact following Danzon dancing L. Johannsen ° , A. Guzman, A. Wing Birmingham, UK Background: Light skin contact affects standing body balance if the tactile signal is correlated with current body sway. A complex situation per- sists when the tactile signal contains mixed components of own body sway and motion of another external source, for example when two individuals hold hands. We investigated the effect of such ‘social’ light touch on each individual’s balance and interpersonal postural coupling as a function of a single session dance exercise. Methods: In eight adult couples standing next to each other, fluctuations of Centre-of-Pressure rate were examined under conditions of normal, uncoupled quiet standing with and without finger tip light touch with a spatial referent and when lightly touching hands. Postural sway was recorded for standing trials before and after 30 minutes of ‘Danzon’ dancing. Results: Participants’ variability of sway rate was significantly reduced in ‘social’ light touch compared to uncoupled standing without any touch contact. However, effects were weaker than uncoupled light touch contact with an external referent. ‘Danzon’ reduced sway in the anterior–posterior direction during uncoupled standing. Coupling between individuals during ‘social’ light touch was generally not found. Conclusions: Social’ light touch is a less reliable source of tactile feedback about body sway than light touch with a spatial referent. In contrast to findings of unintended postural synchronization between two individuals in other contexts, implicit coupling between individuals did not occur despite a physical link. ‘Danzon’ dancing did not affect the coupling between individuals but reduced each individuals sway variability in the anterior–posterior direction during uncoupled standing. P2.075 Gait initiation improved with deep brain stimulation E.L. Johnsen ° , P.H. Mogensen, N. Aa Sunde, K. Østergaard Aarhus, Denmark Gait initiation in Parkinson’s disease (PD) is impaired as a result of functional akinesia and has been related to the muscular rigidity but also the unexplained neuronal loss of the pedunculopontine nucleus. Deep brain stimulation (DBS) of the subthalamic nucleus (STN) has shown to alleviate cardinal symptoms and improve gait function. However, the impact of STN DBS on movement initiation has only sparsely been described. Gait initiation was evaluated in 7 PD patients treated with bilateral STN DBS, standing with both feet on a single force plate in ground level, “on” and “off” stimulation, off medication using the Vicon 612 system. Gait was initiated when a visual cue was given. Initiation cycle was defined from cue until second foot strike. Figure 1. STN DBS improved the timing of events in initiation cycle and length of the first step after initiation cue (p < 0.05). DBS improved displacement of body mass during initiation (Figure 1). OFF treatment, weight was displaced lateral towards the stance limb. ON DBS, weight was shifted postero-lateral towards swing limb heel and the contra-lateral to stanceleg. Forward oriented movement of body mass is a typical sign of PD gait. We address STN DBS influence on gait initiation. OFF STN DBS, patients propagate to initiate motion. Our analyses show DBS enables the patients to shift body load backward and then lateral and thereby initiate motion without propagation. P2.076 Gait episodes and step detection in older adults and Parkinson patients: accuracy of an accelerometry based method and a pedometer B. Dijkstra, W. Zijlstra, E. Scherder, Y. Kamsma ° Groningen, The Netherlands Practical devices that can accurately measure daily activitities in real life situations enable objective evaluation and optimisation of interventions. The aim of this study was to examine the accuracy of an accelerometry based method (DynaPort MicroMod, DM) and a pedometer (Yamax Digi- Walker SW-200, YD) when used for the detection of gait episodes and step activity in older adults and patients with Parkinson’s disease (PD). Results of the DM-system, using a single sensor placed at the lower back, and 2 YD’s, worn on each hip, were evaluated against video observation. Twenty older adults and 32 PD patients walked straight line trajectories of different lengths at different speeds and while doing secondary tasks, in an indoor hallway. The DM’s mean accuracy to measure walking duration was 89.3% for the older adults and 88.9% for the PD patients. Mean accuracy of the DM for step detection was 92.6% for the older adults and 93.1% for the PD patients and decreased to respectively 79.9% (older adults) and 81.6%