Differences in muscle activity during hand-dexterity tasks between women with arthritis and a healthy reference group

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Differences in muscle activity during hand-dexterity tasks between women with arthritis and a healthy reference group. / Brorsson, Sofia; Nilsdotter, Anna; Thorstensson, Carina; Bremander, Ann.

In: BMC Musculoskeletal Disorders, Vol. 15, 154, 2014.

Research output: Contribution to journalArticle

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T1 - Differences in muscle activity during hand-dexterity tasks between women with arthritis and a healthy reference group

AU - Brorsson, Sofia

AU - Nilsdotter, Anna

AU - Thorstensson, Carina

AU - Bremander, Ann

PY - 2014

Y1 - 2014

N2 - Background: Impaired hand function is common in patients with arthritis and it affects performance of daily activities; thus, hand exercises are recommended. There is little information on the extent to which the disease affects activation of the flexor and extensor muscles during these hand-dexterity tasks. The purpose of this study was to compare muscle activation during such tasks in subjects with arthritis and in a healthy reference group. Methods: Muscle activation was measured in m. extensor digitorium communis (EDC) and in m. flexor carpi radialis (FCR) with surface electromyography (EMG) in women with rheumatoid arthritis (RA, n = 20), hand osteoarthritis (HOA, n = 16) and in a healthy reference group (n = 20) during the performance of four daily activity tasks and four hand exercises. Maximal voluntary isometric contraction (MVIC) was measured to enable intermuscular comparisons, and muscle activation is presented as %MVIC. Results: The arthritis group used a higher %MVIC than the reference group in both FCR and EDC when cutting with a pair of scissors, pulling up a zipper and-for the EDC-also when writing with a pen and using a key (p < 0.02). The exercise "rolling dough with flat hands" required the lowest %MVIC and may be less effective in improving muscle strength. Conclusions: Women with arthritis tend to use higher levels of muscle activation in daily tasks than healthy women, and wrist extensors and flexors appear to be equally affected. It is important that hand training programs reflect real-life situations and focus also on extensor strength.

AB - Background: Impaired hand function is common in patients with arthritis and it affects performance of daily activities; thus, hand exercises are recommended. There is little information on the extent to which the disease affects activation of the flexor and extensor muscles during these hand-dexterity tasks. The purpose of this study was to compare muscle activation during such tasks in subjects with arthritis and in a healthy reference group. Methods: Muscle activation was measured in m. extensor digitorium communis (EDC) and in m. flexor carpi radialis (FCR) with surface electromyography (EMG) in women with rheumatoid arthritis (RA, n = 20), hand osteoarthritis (HOA, n = 16) and in a healthy reference group (n = 20) during the performance of four daily activity tasks and four hand exercises. Maximal voluntary isometric contraction (MVIC) was measured to enable intermuscular comparisons, and muscle activation is presented as %MVIC. Results: The arthritis group used a higher %MVIC than the reference group in both FCR and EDC when cutting with a pair of scissors, pulling up a zipper and-for the EDC-also when writing with a pen and using a key (p < 0.02). The exercise "rolling dough with flat hands" required the lowest %MVIC and may be less effective in improving muscle strength. Conclusions: Women with arthritis tend to use higher levels of muscle activation in daily tasks than healthy women, and wrist extensors and flexors appear to be equally affected. It is important that hand training programs reflect real-life situations and focus also on extensor strength.

KW - Muscle activation

KW - Muscle extension force

KW - Flexion force

KW - Female

KW - Daily

KW - activities

U2 - 10.1186/1471-2474-15-154

DO - 10.1186/1471-2474-15-154

M3 - Article

VL - 15

JO - BMC Musculoskeletal Disorders

T2 - BMC Musculoskeletal Disorders

JF - BMC Musculoskeletal Disorders

SN - 1471-2474

M1 - 154

ER -