Presentation on theme: "MENTAL IMAGERY AND VISUALIZATION IN POST- STROKE REHABILITATION Frances Copeland Eddie Revuelta Jessica Salzman Linda Heu Claudiu Mich Katherine Tsobanoudis."— Presentation transcript:
MENTAL IMAGERY AND VISUALIZATION IN POST- STROKE REHABILITATION Frances Copeland Eddie Revuelta Jessica Salzman Linda Heu Claudiu Mich Katherine Tsobanoudis
Learning Objectives At the completion of this topic students will be able to: Define Motor imagery & Mental practice/Motor imagery practice Describe the neurophysiological areas associated with MI Describe the 5-step framework of MI Describe the best way to implement MI in post- stroke rehab Discuss the effectiveness of MI for relearning daily functional tasks – In both the Upper & Lower Extremities
Imagery Definitions: Motor Imagery: Imagining of an action without its physical execution; it is an active process during which the representation of an action is internally reproduced within working memory without any overt output. Mental Practice/Motor Imagery Practice: repetition or rehearsing of imagined motor acts with the intention of improving their physical execution. (F Malouin et al., 2010)
History of Mental Imagery The notion that thoughts rely on imagery was common among philosophers, as far back as Plato (~300 BCE) Introspectionists recorded peoples experiences of MI, following Wundt (~1850) From the ~1913-1960 study of imagery not considered scientific, interest revived after the cognitive revolution.
History of Mental Imagery Guidelines from Sport Science – Teaching and developing imagery can be abstracted from sports – Combine overt movement with imagery techniques, enhances vividness More vivid = more blood flow to visual areas – Sports literature clearly divides imagery techniques and uses applied models Not always the case with Rehab, huge range of actions (S Braun et al., 2008)
Neuroscience and MI Technology used to research the brain while an imagery task is performed – fMRI = functional magnetic resonance imaging Measures hemodynamic response to neural activity – TMS = transcranial magnetic stimulation Noninvasive method to excite neuron Shows causality, by showing what regions are active during a task (Caltech.edu, 2004)
Neuroscience and MI (cont.) fMRI results = V1 (primary visual cortex) is activated during visualization TMS results = disrupting V1 with magnetic impulses causes problems with vision and visual imagery Shows V1 is important for both visual perception and mental imagery
Neurophysiological Study Premotor cortex and rostral part of the posterior SMA were activated bilaterally, this supports the hypothesis that motor imagery involves virtually all stages of motor control. Mental imagery activation is 30% of the level seen in actual performance motor cortex (Roth et al., 1996)
Developing a Framework The subject may imagine the movement in: – 3 rd Person perspective (or external imagery) – 1 st Person perspective (or internal imagery) (F Malouin et al., 2010) 3 Pillars in developing imagery framework – The Patient – Pt's choose activities – The Evidence – Mental practice may alter neural function – The Therapist – Utilize 5-step outline to keep intervention dynamic (S Braun et al., 2008)
5 Step Outline to Intervention 1.Suitable Candidate? 2.Nature of Rx 3.Teach 4.Implant, incorporate, monitor 5.PT reduces support gradually
MI in UE Recovery of Function with Stroke Patients Page et al. (2007) conducted a Randomized Placebo-Controlled Trial 32 chronic stroke patients with moderate motor deficits. Placebo group did 30 minutes of relaxation instead of 30 minutes of mental practice
MI in UE Recovery of Function with Stroke Patients (cont.) Results: MP group showed improvements in ARA and UE FM score. The differences between pre and post-treatment data were significant. Placebo group showed no significant differences between pre and post Conclusion: A traditional rehabilitation program that includes mental practice of tasks practiced during therapy increases outcomes significantly
MI in UE Recovery of Function with Stroke Patients (cont.) Liu (2009) investigated the benefits of an MI intervention to enhance performance of tasks in a new environment for post-stroke patients. 34 patients with a first acute stoke were included All patients received 1 hour of physical therapy five times a week for three weeks Patients in MI group received 1 hour of MI Patients in FR group were given conventional therapy
MI in UE Recovery of Function with Stroke Patients (cont.) Results: There were significant differences between the MI and FR groups in the training environment for the three tasks that involved UE There were significant differences between the MI and FR groups in a new environment, including the three tasks that involved the UE Conclusion: This study provides evidence of the positive effects of MI for improving patients generalization of task performance to new environments
MI in UE Recovery of Function with Stroke Patients In summary, the evidence of MI rehabilitation is promising but still limited (Braun et al (2008)). What does this mean? MI can be applied to post stroke patients in efforts to recover UE function along with physical practice.
Evidence That Locomotor Activities Can Be Imagined Through MI Mentally-simulated and physically- executed locomotor activities: – Similar autonomic responses – Similar temporal organization – Activate neural networks that greatly overlap (Fusi et al. 2005) (Szamcitat et al. 2007) (Bakker et al. 2007)
Evidence of Induced Brain Reorganization Mental and physical practice leads to expansion of bilateral motor areas Initial performance improvement due to greater motor preparation and planning (Sacco et al. 2006) Similar TA activation during motor imagery of simple dorsiflexion and gait (Bakker et al. 2008)
PET and fMRI Studies with Mental Imagery and LE Function MRI scan of subjects brain while: a) Observing video of walking b) Imagining self walking c) Actually walking Results: brain activity similar in imaginary/observational walking as in actual walking (Iseki et al 2008)
Gait Rehabilitation of Chronic Post–Stroke Hemiparesis 17 post-stroke patients, MI training only Intervention: – 15-20 min sessions, 3x/week for 6 weeks Results: Increased walking speed, stride length, and single-leg stance time (affected LE) Improved mobility and dynamic balance (Dunsky et al 2008)
MI Combined with Physical Practice in Gait Training Best adherence and learning effects when training strategies combined Proportions of practice time range from – 1 physical + 5 mental rehearsals – 1 physical + 10 mental rehearsals Best to gradually increase number of mental repetitions (Malouin et al. 2010)
Effectiveness of MI in Gait Training Post-Stroke Best results: MI + physical practice MI = adjunct to conventional gait training Does NOT replace physical practice (Malouin et al. 2010)
Review Learning Objectives Students should be able to: Define Motor imagery & Mental practice/Motor imagery practice Describe the neurophysiological areas associated with MI Describe the 5-step framework of MI Describe the best way to implement MI in post- stroke rehab Discuss the effectiveness of MI for relearning daily functional tasks – In both the Upper & Lower Extremities
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