Table 2 Muscle activity in extensor digitorum communis (EDC) and flexor carpi radialis (FCR) during daily activities and hand exercises for patients with reumatoid arthritis (RA), hand osteoarthritis (HOA) and a healthy reference group (RG) presented as % of MVIC (median and 25–75 percentiles)
RA (n = 20) | HOA (n = 16) | RG (n = 20) | ||||
|---|---|---|---|---|---|---|
% of MVC in EDC | % of MVC in FCR | % of MVC in EDC | % of MVC in FCR | % of MVC in EDC | % of MVC in FCR | |
Daily activities | ||||||
Task 1(pen) | 24.2 (18.0–30.5) | 22.3 (11.4–40.6) | 32.3** (30.1–75.0) | 22.5 (15.8–53.8) | 20.8* (16.9–27.4) | 12.6 (5.5–35.8) |
Task 2 (locking) | 16.3 (10.7–23.7) | 11.0 (6.4–26.0) | 27.4* (15.3–65.7) | 17.6 (11.3–25.5) | 15.5 (8.3–21.0) | 7.5 (4.1–18.0) |
Task 3 (cutting) | 29.6 (19.0–51.1) | 29.5* (18.0–37.5) | 45.4*** (30.6–62.0) | 32.8** (20.9–49.3) | 23.7** (20.7–29.6) | 14.7*** (9.2–25.7) |
Task 4 (zipper) | 16.9* (14.2–30.3) | 17.3** (10.9–27.3) | 23.0** (17.2–32.4) | 12.2 (8.9–30.3) | 11.0*** (8.5–15.7) | 7.7** (4.0–12.7) |
Hand exercises | ||||||
1 (squeezing) | 66.8 (45.8–85.3) | 104.2 (58.2–132.6) | 54.9 (41.0–94.9) | 113.1 (89.4–159.1) | 50.1 (41.1–63.7) | 73.5 (55.0–137.0) |
2 (rolling) | 35.5* (26.1–48.4) | 22.6* (11.3–36.4) | 38.7** (28.1–53.5) | 28.0** (13.3–53.7) | 20.9*** (16.5-30.5) | 9.3*** (4.1-18.7) |
3 (finger ext) | 65.6 (44.1–93.0) | 49.1 (39.6–76.2) | 69.6 (44.0–138.8) | 73.9 (49.1–116.6) | 60.1 (36.7–77.9) | 39.4 (29.2–84.6) |
4a (opposition II) | 55.8 (29.9–62.2) | 27.2 (15.1–38.6) | 47.6 (27.1–74.3) | 32.1 (22.5–65.6) | 29.9* (25.9–46.6) | 21.9 (10.3–33.1) |
4b (opposition III) | 62.5 (33.1-85.7) | 50.1 (29.0-73.4) | 59.3 (39.9-169-5) | 68.0 (38.9-89.4) | 45.2 (36.4–66.3) | 39.1 (20.9–77.9) |
4c (opposition IV) | 58.2 (44.2–82.9) | 82.8 (39.9–110.7) | 57.7 (42.8–134.2) | 95.6 (69.0–160.9) | 45.8* (40.8–67.2) | 55.1 (30.7–108.9) |
4d (opposition V) | 68.9 (54.0–80.4) | 61.3 (36.7–89.0) | 77.1 (47.9–163.8) | 78.4 (54.7–129.3) | 56.1 (45.3–77.5) | 46.9 (22.1–76.8) |