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Abstract

Two single case studies are presented to analyze the relationship between feedback and upper extremity muscle change in poststroke paretic patients. In Study I a patient was provided feedback for increasing extensor digitorium (hand) activity in an ABABAB design. Results indicated reliable increases in muscle activity when feedback was available, and decreases when feedback was removed. The effects of instructions to tense the bicep muscle and feedback for biceps activity were compared each session for a second patient in Study II. In addition, two sessions were used to analyze the effects of cross conduction, or the opposite bicep contracting, and volume conduction, the adjacent tricep contracting, as factors in increasing biceps activity in the paretic arm. Results showed reliably better performance during feedback than during instructions, and performance during the control conditions was sufficient to rule out cross or volume conduction as contributing factors in paretic bicep activity.

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References

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Feedback Influenced EMG Changes in Stroke Patients

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