Table 7. Within-session reliability for PF and RFD across maturity groups.
| Variable |
Day |
Mean ±
SD |
ICC (95%
CI) |
ICC
Interpretation |
CV (%)
(95% CI) |
SEM (95%
CI) |
|
1 |
1722.1
± 716.1 |
0.97 (0.96-0.98) |
Excellent |
4.6 (3.8-5.3) |
17.94 (16.15-19.74) |
| PF (All) |
2 |
1891.3
± 706.7 |
0.98 (0.97-0.99) |
Excellent |
4.3 (3.5-5.1) |
12.46 (11.21-13.70) |
|
3 |
1856.9
± 730.3 |
0.97 (0.95-0.98) |
Excellent |
4.9 (3.9-5.9) |
22.97 (20.67-25.26) |
|
1 |
1952.7
± 2171.9 |
0.74 (0.63-0.82) |
Moderate |
53.4 (47.5-59.3) |
562.18
(505.96-618.39) |
| RFD50 (All) |
2 |
2455.0
± 2039.2 |
0.55 (0.39-0.68) |
Moderate |
49.6 (42.3-57.0) |
921.58
(829.42-1013.73) |
|
3 |
2714.5
± 2162.0 |
0.35 (0.18-0.53) |
Poor |
49.1 (41.8-56.4) |
1403.20
(1262.88-1543.52) |
|
1 |
2551.8
± 1441.3 |
0.85 (0.78-0.90) |
Good |
19.4 (15.3-23.4) |
218.14
(196.33-239.96) |
| RFD250 (All) |
2 |
3075.9
± 1551.8 |
0.86 (0.78-0.91) |
Good |
17.4 (13.2-21.7) |
221.53
(199.37-243.68) |
|
3 |
3131.0
± 1469.4 |
0.90 (0.85-0.94) |
Excellent |
14.5 (11.3-17.6) |
140.38
(126.34-154.42) |
|
1 |
978.4 ±
200.4 |
0.96 (0.92-0.98) |
Excellent |
3.5 (2.3-4.6) |
6.98 (6.28-7.67) |
| PF (Pre) |
2 |
1101.9
± 231.0 |
0.90 (0.80-0.96) |
Excellent |
5.1 (2.7-7.6) |
22.22 (19.99-24.44) |
|
3 |
1038.0
± 198.0 |
0.93 (0.83-0.97) |
Excellent |
4.3 (2.8-5.8) |
14.56 (13.10-16.01) |
|
1 |
1024.9
± 662.5 |
0.30 (0.04-0.59) |
Poor |
49.0 (40.7-57.4) |
464.75
(418.27-511.22) |
| RFD50 (Pre) |
2 |
1410.3
± 1239.6 |
0.17 (0.00-0.51) |
Poor |
54.0 (38.9-69.2) |
1015.08
(913.57-1116.58) |
|
3 |
1514.5
± 956.1 |
0.18 (0.00-0.54) |
Poor |
55.6 (43.3-67.9) |
791.76
(712.58-870.93) |
|
1 |
1352.3
± 535.9 |
0.72 (0.52-0.87) |
Moderate |
18.5 (10.4-26.6) |
146.61
(131.95-161.27) |
| RFD250 (Pre) |
2 |
1682.1
± 549.9 |
0.45 (0.13-0.72) |
Poor |
20.6 (10.8-30.4) |
301.29
(271.16-331.41) |
|
3 |
1602.8
± 510.0 |
0.61 (0.34-0.84) |
Moderate |
20.0 (11.5-28.6) |
197.80
(178.02-217.58) |
|
1 |
1775.8
± 404.7 |
0.91 (0.84-0.96) |
Excellent |
4.9 (3.4-6.4) |
34.50 (31.05-37.95) |
| PF (Circa) |
2 |
1911.9
± 481.2 |
0.97 (0.95-0.99) |
Excellent |
3.6 (2.8-4.4) |
13.68 (12.31-15.05) |
|
3 |
1861.3
± 462.3 |
0.93 (0.86-0.97) |
Excellent |
5.7 (4.2-7.1) |
33.97 (30.57-37.37) |
|
1 |
1580.4
± 1186.6 |
0.39 (0.12-0.64) |
Poor |
57.8 (47.4-68.2) |
717.67
(645.90-789.43) |
| RFD50 (Circa) |
2 |
2523.5
± 1630.5 |
0.35 (0.09-0.62) |
Poor |
51.1 (40.0-62.2) |
1046.74
(942.07-1151.41) |
|
3 |
3233.7
± 2380.5 |
0.33 (0.07-0.63) |
Poor |
41.2 (29.6-52.8) |
1604.94
(1444.45-1765.43) |
|
1 |
2416.5
± 874.4 |
0.53 (0.29-0.75) |
Moderate |
21.0 (14.2-27.7) |
406.45
(365.81-447.10) |
| RFD250 (Circa) |
2 |
3010.1
± 979.3 |
0.64 (0.41-0.82) |
Moderate |
15.4 (8.6-22.3) |
346.62
(311.96-381.28) |
|
3 |
3178.6
± 915.2 |
0.83 (0.66-0.92) |
Good |
10.8 (7.2-14.3) |
155.81
(140.23-171.39) |
|
1 |
2527.3
± 464.6 |
0.88 (0.76-0.95) |
Good |
5.4 (3.9-6.9) |
53.98 (48.58-59.38) |
| PF (Post) |
2 |
2608.7
± 383.5 |
0.90 (0.78-0.96) |
Good |
4.5 (3.4-5.5) |
39.37 (35.43-43.30) |
|
3 |
2619.3
± 404.7 |
0.81 (0.62-0.92) |
Good |
4.7 (2.2-7.1) |
77.32 (69.58-85.05) |
|
1 |
3525.9
± 3242.7 |
0.73 (0.49-0.88) |
Moderate |
52.8 (39.0-66.5) |
862.13
(775.92-948.35) |
| RFD50 (Post) |
2 |
3353.8
± 2602.3 |
0.60 (0.31-0.80) |
Moderate |
43.7 (28.8-58.7) |
1038.62
(934.76-1142.49) |
|
3 |
3222.9
± 2289.4 |
0.19 (0.00-0.53) |
Poor |
52.3 (36.7-68.0) |
1847.01
(1662.31-2031.71) |
|
1 |
4138.2
± 1289.1 |
0.67 (0.41-0.85) |
Moderate |
18.4 (11.0-25.8) |
420.60
(378.54-462.66) |
| RFD250 (Post) |
2 |
4469.0
± 1558.9 |
0.78 (0.58-0.90) |
Good |
17.0 (10.1-23.8) |
334.61
(301.15-368.07) |
|
3 |
4507.1
± 1196.0 |
0.73 (0.49-0.88) |
Moderate |
13.6 (9.0-18.2) |
320.61
(288.55-352.67) |
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.
