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Title: The use of motor imagery in the treatment of the hemiplegic hand in adults
Author: O'Brien, Jonathon
ISNI:       0000 0004 2720 0053
Awarding Body: Prifysgol Bangor University
Current Institution: Bangor University
Date of Award: 2011
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Background: Recent work on mental practice using motor imagery (MI) in the treatment of post-stroke motor impairments. Aim: To provide evidence regarding effects of MI on hemiplegic intrinsic hand muscles. Objectives: Experiment one's objective was to identify if kinaesthetic MI (KMI) activated the hemiplegic lumbrical muscles and reduced overall movement time (MT). Experiment two's objective was to identify if KMI and visual motor imagery (VMI) had different effects on lumbrical activity and MT. Experiment three's objective was to establish if VMI or KMI provoked electromyogram (EMG) activity in the hemiplegic or intact abductor pollicis brevis (APB). Design/methodology: Experiment one used optoelectronic motion capture in a single factor independent groups design. Dependent variables (DVs) included joint magnitude, velocity and MT. Experiment two employed optoelectronic capture in a between-within design. DV s included interjoint correlation, joint magnitude and MT. Experiment three used a between-within design, measuring EMG in APB and abductor digiti minimi (ADM). DVs were EMG levels in different conditions. Participants: Experiment one involved ten adults with hemiplegia. (Mage= 74.4, SDage= 10.3). Five were male. Experiment two involved 15 adults with hemiplegia (M age = 60.6, SDage = 12.9). Six were male. Experiment three involved ten adults with hemiplegia (M age = 59.8, SD age= 10.57). Five were male. It also included ten non-hemiplegic adults (M age = 59.8, SD age = 9.09). Six were male. All were Colombian. Results: In experiment one MT was shorter for KMI (p = .031). Experiment two also showed shorter MT for KMI (p = .022) and significant negative correlation between two finger joints for VMI (p = .01), suggesting improved lumbrical activation. Experiment three found lower EMG in the hemiplegic APB following KMI (p = 0.019), compared with rest. Conclusions: KMI is more effective in reducing MT and pathologically raised EMG. VMI may improve interjoint coordination.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available