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Shoulder and elbow muscle activity during fully supported trajectory tracking in neurologically intact older people

Shoulder and elbow muscle activity during fully supported trajectory tracking in neurologically intact older people
Shoulder and elbow muscle activity during fully supported trajectory tracking in neurologically intact older people
An inability to perform tasks involving reaching is a common problem for stroke patients. Knowledge of normal muscle activation patterns during these tasks is essential to the identification of abnormal patterns in post-stroke hemiplegia. Findings will provide insight into changes in muscle activation patterns associated with recovery of upper limb function. In this study with neurologically intact participants the co-ordination of shoulder and elbow muscle activity during two dimensional reaching tasks is explored. Eight participants undertook nine tracking tasks in which trajectory (orientation and length), duration, speed and resistance to movement were varied. The participants’ forearm was supported using a hinged arm-holder, which constrained their hand to move in a two dimensional plane. EMG signals were recorded from triceps, biceps, anterior deltoid, upper, middle and lower trapezius and pectoralis major. A wide variation in muscle activation patterns, in terms of timing and amplitude, was observed between participants performing the same task. EMG amplitude increased significantly with length, duration and resistance of the task for all muscles except anterior deltoid. Co-activation between biceps and triceps was significantly dependent on both task and trajectory orientation. Activation pattern of pectoralis major was dependent on trajectory. Neither trajectory orientation nor task condition affected the activation pattern of anterior deltoid. Normal ranges of timing of muscle activity during the tasks were identified.
1050-6411
1025-1034
Hughes, Ann-Marie
11239f51-de47-4445-9a0d-5b82ddc11dea
Freeman, Christopher
ccdd1272-cdc7-43fb-a1bb-b1ef0bdf5815
Burridge, Jane
7c453775-c3ae-4d55-99af-2ed8600ca680
Chappell, Paul
2d2ec52b-e5d0-4c36-ac20-0a86589a880e
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Pickering, Ruth
db5e2c58-b642-4eff-9241-625c87421e85
Rogers, Eric
611b1de0-c505-472e-a03f-c5294c63bb72
Hughes, Ann-Marie
11239f51-de47-4445-9a0d-5b82ddc11dea
Freeman, Christopher
ccdd1272-cdc7-43fb-a1bb-b1ef0bdf5815
Burridge, Jane
7c453775-c3ae-4d55-99af-2ed8600ca680
Chappell, Paul
2d2ec52b-e5d0-4c36-ac20-0a86589a880e
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Pickering, Ruth
db5e2c58-b642-4eff-9241-625c87421e85
Rogers, Eric
611b1de0-c505-472e-a03f-c5294c63bb72

Hughes, Ann-Marie, Freeman, Christopher, Burridge, Jane, Chappell, Paul, Lewin, Paul, Pickering, Ruth and Rogers, Eric (2009) Shoulder and elbow muscle activity during fully supported trajectory tracking in neurologically intact older people. Journal of Electromyography and Kinesiology, 19 (6), 1025-1034. (PMID:19101167)

Record type: Article

Abstract

An inability to perform tasks involving reaching is a common problem for stroke patients. Knowledge of normal muscle activation patterns during these tasks is essential to the identification of abnormal patterns in post-stroke hemiplegia. Findings will provide insight into changes in muscle activation patterns associated with recovery of upper limb function. In this study with neurologically intact participants the co-ordination of shoulder and elbow muscle activity during two dimensional reaching tasks is explored. Eight participants undertook nine tracking tasks in which trajectory (orientation and length), duration, speed and resistance to movement were varied. The participants’ forearm was supported using a hinged arm-holder, which constrained their hand to move in a two dimensional plane. EMG signals were recorded from triceps, biceps, anterior deltoid, upper, middle and lower trapezius and pectoralis major. A wide variation in muscle activation patterns, in terms of timing and amplitude, was observed between participants performing the same task. EMG amplitude increased significantly with length, duration and resistance of the task for all muscles except anterior deltoid. Co-activation between biceps and triceps was significantly dependent on both task and trajectory orientation. Activation pattern of pectoralis major was dependent on trajectory. Neither trajectory orientation nor task condition affected the activation pattern of anterior deltoid. Normal ranges of timing of muscle activity during the tasks were identified.

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Published date: December 2009
Organisations: EEE, Southampton Wireless Group

Identifiers

Local EPrints ID: 267297
URI: https://eprints.soton.ac.uk/id/eprint/267297
ISSN: 1050-6411
PURE UUID: c56ca1fc-fd6e-493d-8069-a969e5da583a
ORCID for Ann-Marie Hughes: ORCID iD orcid.org/0000-0002-3958-8206

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Date deposited: 27 Apr 2009 12:02
Last modified: 06 Jun 2018 12:40

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