Table 2 Intra-rater relative and absolute reliability of concentric isokinetic measures of knee extensor and flexor muscle strength at angular velocity of 60°/s

mild-AD

(CDR = 1)

(n = 22)

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

83.2 (22.6)

34.5 (16.8)

75.2 (21.4)

29.2 (15.7)

211.8 (68.5)

78.4 (55.4)

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

88.7 (29.1)

42.5 (18.0)

79.9 (27.0)

36.7 (17.9)

225.2 (86.0)

100.3 (62.4)

ICC_3,1 (CI₉₅)

0.71 (0.43–0.87)

0.71 (0.30–0.88)

0.86 (0.67–0.94)

0.81 (0.47–0.93)

0.88 (0.72–0.95)

0.84 (0.58–0.94)

SEM

13.8

9.5

9.1

7.5

26.7

23.4

SEM%

15.6%

22.3%

11.4%

20.4%

11.8%

23.3%

MDC₉₅

32.1

21.9

21.0

17.3

61.9

54.4

MDC₉₅%

36.2%

51.5%

26.3%

47.1%

27.5%

54.2%

moderate-AD

(CDR = 2)

(n = 20)

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

73.1 (33.0)

32.1 (16.4)

64.2 (30.0)

26.7 (14.2)

172.7 (101.3)

71.4 (50.6)

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

66.1 (30.3)

30.8 (20.4)

58.2 (26.6)

25.8 (18.2)

162.5 (83.8)

69.6 (63.7)

ICC_3,1 (CI₉₅)

0.81 (0.58–0.92)

0.80 (0.56–0.91)

0.87 (0.68–0.95)

0.90 (0.74–0.96)

0.85 (0.63–0.94)

0.88 (0.70–0.95)

SEM

13.8

8.2

10.1

5.1

35.4

19.5

SEM%

18.9%

25.5%

15.7%

19.1%

20.5%

27.3%

MDC₉₅

31.9

19.1

23.5

11.9

82.0

45.2

MDC₉₅%

43.6%

59.5%

36.6%

44.6%

47.5%

63.3%

without-AD

(n = 20)

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

115.8 (23.4)

54.6 (24.6)

104.0 (23.8)

49.7 (24.0)

321.4 (72.8)

150.2 (82.7)

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

120.7 (27.2)

60.6 (20.3)

110.8 (27.4)

53.9 (18.4)

336.2 (86.3)

171.2 (74.5)

ICC_3,1 (CI₉₅)

0.73 (0.44–0.82)

0.87 (0.64–0.95)

0.79 (0.49–0.91)

0.92 (0.80–0.97)

0.82 (0.55–0.93)

0.92 (0.76–0.97)

SEM

13.1

8.1

11.6

5.9

33.8

22.4

SEM%

10.8%

13.4%

10.5%

10.9%

10.0%

13.1%

MDC₉₅

30.4

19.9

27.0

13.7

78.3

52.0

MDC₉₅%

25.2%

32.8%

24.4%

25.4%

23.3%

30.4%