Table 8. Between-day reliability for PF and RFD across maturity groups.
| Category |
Variable |
Mean (±
SD) |
ICC (95%CI) |
ICC
Interpretation |
CV (95%CI) |
SEM (95%CI) |
| All |
|
PF |
1898.93
± 748.81 |
0.95 (0.92-0.97) |
Excellent |
7.6 (6.6-8.6) |
39.01 (35.11-42.91) |
|
RFD50 |
3349.71
± 2411.45 |
0.48 (0.32-0.64) |
Poor |
39.3 (33.4-45.2) |
1282.64
(1154.37-1410.90) |
|
RFD100 |
3555.87
± 2271.47 |
0.73 (0.62-0.83) |
Moderate |
27.8 (23.6-32.0) |
614.53
(553.08-675.99) |
|
RFD150 |
3513.91
± 2025.33 |
0.79 (0.71-0.87) |
Good |
22.9 (19.5-26.4) |
416.52
(374.87-458.17) |
|
RFD200 |
3501.99
± 1786.05 |
0.81 (0.75-0.89) |
Good |
19.6 (16.3-22.8) |
338.10
(304.29-371.92) |
|
RFD250 |
3289.96
± 1531.18 |
0.87 (0.82-0.93) |
Good |
14.7 (12.4-17.1) |
205.23
(184.71-225.75) |
| Pre |
|
PF |
1090.21
± 217.51 |
0.83 (0.74-0.95) |
Good |
7.4 (5.4-9.3) |
36.65 (32.98-40.31) |
|
RFD50 |
2018.94
± 1182.92 |
0.30 (0.01-0.65) |
Poor |
40.5 (29.9-51.0) |
840.63
(756.57-924.70) |
|
RFD100 |
2075.73
± 897.65 |
0.43 (0.13-0.73) |
Poor |
29.1 (20.1-38.0) |
509.49
(458.54-560.44) |
|
RFD150 |
1964.72
± 690.06 |
0.43 (0.11-0.72) |
Poor |
24.5 (17.5-31.5) |
394.03
(354.63-433.44) |
|
RFD200 |
1937.56
± 541.45 |
0.49 (0.20-0.77) |
Poor |
19.6 (14.8-24.4) |
278.30
(250.47-306.13) |
|
RFD250 |
1825.43
± 454.49 |
0.60 (0.35-0.84) |
Moderate |
15.2 (11.5-18.9) |
183.60
(165.24-201.96) |
| Circa |
|
PF |
1896.76
± 468.78 |
0.84 (0.73-0.94) |
Good |
8.3 (6.4-10.1) |
75.20 (67.68-82.72) |
|
RFD50 |
3531.81
± 2298.92 |
0.09 (0.00-0.43) |
Poor |
43.9 (31.9-56.0) |
2149.94
(1934.94-2364.93) |
|
RFD100 |
3595.28
± 1679.46 |
0.31 (0.06-0.62) |
Poor |
31.4 (23.7-39.0) |
1174.87
(1057.38-1292.36) |
|
RFD150 |
3499.47
± 1427.77 |
0.42 (0.20-0.72) |
Poor |
25.2 (18.8-31.6) |
837.06
(753.35-920.76) |
|
RFD200 |
3443.47
± 1191.70 |
0.41 (0.24-0.75) |
Poor |
22.9 (16.7-29.1) |
732.96
(659.67-806.26) |
|
RFD250 |
3217.58
± 916.29 |
0.59 (0.49-0.86) |
Moderate |
16.0 (11.5-20.5) |
384.93
(346.43-423.42) |
| Post |
|
PF |
2697.34
± 434.40 |
0.79 (0.58-0.91) |
Good |
6.8 (5.0-8.5) |
91.08 (81.97-100.18) |
|
RFD50 |
4705.24
± 2809.73 |
0.64 (0.37-0.84) |
Moderate |
31.8 (23.1-40.5) |
990.20
(891.18-1089.22) |
|
RFD100 |
5281.42
± 2769.23 |
0.80 (0.60-0.91) |
Good |
20.9 (14.8-27.1) |
538.44
(484.59-592.28) |
|
RFD150 |
5270.82
± 2181.26 |
0.82 (0.63-0.92) |
Good |
17.3 (12.1-22.6) |
388.80
(349.92-427.68) |
|
RFD200 |
5250.79
± 1619.35 |
0.77 (0.56-0.90) |
Good |
14.3 (8.4-20.1) |
361.57
(325.41-397.73) |
|
RFD250 |
4922.64
± 1195.04 |
0.71 (0.47-0.88) |
Moderate |
11.4 (7.0-15.9) |
340.80
(306.72-374.88) |
PF = peak force; RFD = rate of force development; SD = standard deviation; ICC = intraclass correlation coefficient; CI = confidence interval; CV = coefficient of variation; SEM = standard error of measurement; Pre = pre-PHV; Circa = circa-PHV; Post = post-PHV; PHV = peak height velocity.
