Table 4 Intra-rater relative and absolute reliability of concentric isokinetic measures of plantar flexor and dorsiflexor muscle strength at angular velocity of 30°/s

mild-AD

(CDR = 1)

(n = 22)

Session 1,\(\stackrel{-}{\text{X}}\)(SD)

43.9 (15.9)

31.7 (8.2)

35.4 (12.9)

29.4 (7.3)

41.8 (23.3)

45.1 (20.2)

Session 2,\(\stackrel{-}{\text{X}}\)(SD)

48.4 (16.2)

31.5 (7.4)

38.5 (15.6)

29.0 (6.3)

45.6 (27.7)

44.2 (19.5)

ICC_3,1 (CI₉₅)

0.78 (0.52–0.90)

0.78 (0.54–0.90)

0.83 (0.59–0.93)

0.92 (0.80–0.96)

0.79 (0.50–0.91)

0.91 (0.78–0.96)

SEM

7.5

3.6

5.9

1.9

11.6

5.8

SEM%

15.5%

11.3%

15.3%

6.5%

25.4%

12.9%

MDC₉₅

17.5

8.4

13.8

4.5

26.9

13.6

MDC₉₅%

36.1%

26.5%

35.8%

15.3%

59.0%

30.1%

moderate-AD

(CDR = 2)

(n = 20)

Session 1,\(\stackrel{-}{\text{X}}\)(SD)

37.2 (17.9)

31.7 (7.9)

30.2 (16.1)

27.8 (6.0)

35.2 (28.9)

39.6 (14.9)

Session 2,\(\stackrel{-}{\text{X}}\)(SD)

38.4 (22.9)

30.9 (8.0)

31.4 (19.5)

28.6 (7.6)

34.6 (34.8)

40.3 (13.3)

ICC_3,1 (CI₉₅)

0.78 (0.52–0.91)

0.66 (0.32–0.85)

0.93 (0.83–0.97)

0.63 (0.05–0.85)

0.93 (0.83–0.97)

0.63 (0.05–0.86)

SEM

9.5

4.6

4.6

4.1

8.0

8.4

SEM%

24.7%

14.5%

14.6%

14.3%

22.7%

20.8%

MDC₉₅

22.1

10.6

10.8

9.5

18.7

19.5

MDC₉₅%

57.5%

33.4%

34.4%

33.2%

53.1%

48.4%

without-AD

(n = 20)

Session 1,\(\stackrel{-}{\text{X}}\)(SD)

70.6 (34.9)

41.9 (11.5)

62.6 (31.1)

37.4 (8.5)

108.7 (74.1)

70.4 (25.2)

Session 2,\(\stackrel{-}{\text{X}}\)(SD)

76.7 (40.6)

44.0 (11.0)

67.8 (35.2)

39.9 (8.9)

117.3 (75.4)

75.9 (20.0)

ICC_3,1 (CI₉₅)

0.92 (0.80–0.97)

0.84 (0.65–0.93)

0.96 (0.89–0.98)

0.89 (0.70–0.96)

0.97 (0.93–0.99)

0.87 (0.69–0.95)

SEM

10.4

4.4

6.7

2.9

12.6

8.0

SEM%

13.5%

10.0%

9.9%

7.3%

10.7%

10.5%

MDC₉₅

24.1

10.2

15.5

6.6

29.2

18.5

MDC₉₅%

31.4%

23.2%

22.9%

16.5%

24.9%

24.4%