Background
Methods
Study population
The Vicon and Captury systems
Test procedure
The positioning of the reflective markers
Recordings
Event marking and synchronization of recordings
Measured variables
Measurement types
Statistical analyses
Peak and point value analysis
Through range motion analysis
Evaluation of agreement estimates
Evaluation of reliability estimates
Results
Descriptive Statistics | Agreement and Reliability | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Variable | System | min | mean | max | SD | LLoA | MD | ULoA | ICC(2,1) A | ICC(2,1) C |
Jump Height | Vicon | −1.3a | 7.4 | 16.4 | 4.0 | −3.8 | −0.8 | 2.2 | 0.91 [0.69;0.99] | 0.93 [0.76;0.99] |
Captury | −1.8a | 8.2 | 17.7 | 4.6 | ||||||
Jump Length | Vicon | 27.8 | 77.4 | 122.2 | 27.8 | −6.6 | −0.7 | 5.2 | 0.99 [0.98;1.00] | 0.99 [0.99;1.00] |
Captury | 26.0 | 78.4 | 124.6 | 27.3 |
Variable | Range of Motion | Correlation and Agreement Estimates | |||||
---|---|---|---|---|---|---|---|
Vicon | Captury | RMC | RMSE | LLoA | MD | ULoA | |
Squats | |||||||
Knee Flexion (°) | −21.7 to 146.0 | −17.1 to 161.2 | 0.99 | 6.4 | −25.1 | −10.8 | 3.5 |
Hip Flexion (°) | −10.9 to 111.9 | −19.6 to 125.2 | 0.92 | 11.4 | − 32.9 | −0.6 | 31.8 |
Ankle Dorsi Flexion (°) | −42.8 to 52.1 | − 64.6 to 60.9 | 0.95 | 4.3 | −13.5 | − 1.0 | 11.5 |
Knee Varus (°) | −30.4 to 43.5 | −28.8 to 20.8 | 0.28 | 5.9 | −32.5 | − 6.7 | 19.1 |
FP Projection Angle (°) | − 164.0 to 176.2 | − 179.9 to 179.9 | 0.74 | 15.7 | − 84.1 | −5.9 | 72.3 |
FP Knee Angle (°) | −10.7 to 29.7 | −16.6 to 37.5 | 0.83 | 3.7 | −9.2 | 0.7 | 10.5 |
FP Knee Deviation (mm) | −34.2 to 146.0 | −52.4 to 176.1 | 0.88 | 10.6 | −33.6 | −1.1 | 31.4 |
Knee-Hip SDR (ratio) | 0.71 to 3.73 | 0.42 to 3.89 | 0.96 | 0.08 | −0.36 | 0.01 | 0.38 |
Ankle-Hip SDR (ratio) | 0.47 to 2.01 | 0.42 to 1.96 | 0.88 | 0.05 | −0.26 | 0.03 | 0.32 |
Jumps | |||||||
Knee Flexion (°) | −17.0 to 136.9 | −15.0 to 155.1 | 0.93 | 10.4 | −26.4 | −3.6 | 19.3 |
Hip Flexion (°) | −9.1 to 116.9 | −16.6 to 141.0 | 0.77 | 16.9 | −34.1 | 7.4 | 49.0 |
Ankle Dorsi Flexion (°) | −56.9 to 49.5 | − 80.3 to 63.5 | 0.88 | 11.0 | −32.4 | 3.6 | 39.6 |
FP Projection Angle (°) | −176.7 to 177.6 | −179.2 to 178.6 | 0.38 | 20.3 | −66.0 | −0.2 | 66.4 |
FP Knee Angle (°) | −45.2 to 85.8 | −47.7 to 90.7 | 0.75 | 6.6 | −14.8 | 0.5 | 15.8 |
FP Knee Deviation (mm) | −33.1 to 81.9 | − 67.8 to 149.7 | 0.63 | 12.6 | −45.7 | −1.0 | 43.8 |
Knee-Hip SDR (ratio) | 0.67 to 3.29 | 0.42 to 3.71 | 0.95 | 0.11 | −0.42 | 0.02 | 0.45 |
Ankle-Hip SDR (ratio) | 0.53 to 5.83 | 0.57 to 6.55 | 0.98 | 0.13 | −0.46 | 0.02 | 0.49 |
Compared Values | Agreement | Reliability | ||||
---|---|---|---|---|---|---|
LLoA | MD | ULoA | Precision Span | ICC(2,1) A [CI] | ICC(2,1) C [CI] | |
Ankle Dorsi Flexion (°) | ||||||
Squats | ||||||
Maximum values | −16.0 | −3.5 | 8.9 | ± 12.4e | 0.69c [0.23;0.93] | 0.74c [0.30;0.94] |
Minimum values | −11.9 | 0.7 | 13.3 | ± 12.6e | 0.62c [0.06;0.92] | 0.63c [0.07;0.93] |
Deepest position in squat | −17.0 | −2.0 | 13.0 | ± 15.0f | 0.68c [0.26;0.92] | 0.70c [0.31;0.93] |
Midpoint in descent | −3.5 | 3.5 | 10.5 | ± 7.0e | 0.75b [0.38;0.94] | 0.85b [0.55;0.97] |
Jumps | ||||||
Maximum values | −22.6 | −8.2 | 6.2 | ± 14.4f | 0.38d [0.00;0.69] | 0.58c [0.00;0.91] |
Minimum values | −12.6 | 19.3 | 51.3 | ± 31.9h | 0.22d [0.00;0.51] | 0.44d [0.00;0.84] |
Deepest position in landing | −22.7 | −5.7 | 11.3 | ± 17.0f | 0.62c [0.00;0.96] | 0.69c [0.00;0.97] |
Landing Impact | −15.1 | 5.5 | 26.1 | ± 20.6g | 0.70c [0.29;0.94] | 0.76b [0.39;0.96] |
Ankle Hip Separation Distance Ratio (ratio) | ||||||
Squats | ||||||
Maximum values | −0.29 | − 0.01 | 0.28 | ± 0.29e | 0.89b [0.72;0.97] | 0.89b [0.72;0.97] |
Minimum values | −0.29 | − 0.01 | 0.28 | ± 0.29e | 0.86b [0.59;0.98] | 0.88b [0.66;0.98] |
Deepest position in squat | −0.27 | 0.01 | 0.30 | ± 0.29e | 0.89b [0.64;0.98] | 0.89b [0.66;0.98] |
Midpoint in descent | −0.27 | 0.01 | 0.30 | ± 0.29e | 0.91a [0.78;0.98] | 0.92a [0.79;0.98] |
Jumps | ||||||
Maximum values | −0.57 | 0.05 | 0.68 | ± 0.62f | 0.94a [0.82;0.99] | 0.95a [0.86;0.99] |
Minimum values | −0.31 | 0.04 | 0.38 | ± 0.34e | 0.73c [0.00;0.96] | 0.74c [0.00;0.97] |
Deepest position in landing | −0.41 | 0.07 | 0.55 | ± 0.48e | 0.89b [0.59;0.99] | 0.90a [0.63;0.99] |
Landing Impact | −0.43 | 0.05 | 0.53 | ± 0.48e | 0.95a [0.74;0.99] | 0.95a [0.75;1.00] |
Frontal Plane Knee Angle (°) | ||||||
Squats | ||||||
Maximum values | −11.0 | −0.6 | 9.7 | ± 10.3e | 0.88b [0.73;0.95] | 0.87b [0.75;0.96] |
Minimum values | −4.4 | 1.7 | 7.8 | ± 6.1e | 0.65c [0.11;0.94] | 0.70c [0.14;0.96] |
Deepest position in squat | −11.0 | 3.3 | 17.6 | ± 14.3f | 0.78b [0.50;0.94] | 0.82b [0.56;0.95] |
Midpoint in descent | −6.7 | 1.4 | 9.5 | ± 8.1e | 0.78b [0.34;0.95] | 0.80b [0.38;0.97] |
Jumps | ||||||
Maximum values | −19.6 | −1.2 | 17.3 | ± 18.5g | 0.72c [0.06;0.98] | 0.73c [0.06;0.99] |
Minimum values | −7.2 | 2.1 | 11.4 | ± 9.3e | 0.81b [0.41;0.98] | 0.84b [0.47;0.99] |
Deepest position in landing | −18.7 | −0.3 | 18.1 | ± 18.4g | 0.54c [0.01;0.89] | 0.56c [0.01;0.90] |
Landing Impact | −9.6 | −0.1 | 9.4 | ± 9.5e | 0.80b [0.51;0.95] | 0.81b [0.53;0.95] |
Frontal Plane Knee Deviation (mm) | ||||||
Squats | ||||||
Maximum values | −41.7 | −8.6 | 24.6 | ± 33.2e | 0.90a [0.76;0.97] | 0.92a [0.79;0.98] |
Minimum values | −18.1 | 4.3 | 26.7 | ± 22.4e | 0.58c [0.14;0.87] | 0.61c [0.15;0.88] |
Deepest position in squat | −44.5 | −0.8 | 42.9 | ± 43.7f | 0.89b [0.75;0.97] | 0.90b [0.76;0.97] |
Midpoint in descent | −25.5 | 3.5 | 32.5 | ± 29.0e | 0.85b [0.59;0.96] | 0.86b [0.63;0.96] |
Jumps | ||||||
Maximum values | −78.7 | −13.7 | 51.4 | ± 65.1g | 0.47d [0.00;0.89] | 0.51c [0.00;0.91] |
Minimum values | −18.9 | 9.5 | 38.0 | ± 28.4e | 0.45d [0.04;0.82] | 0.53c [0.06;0.87] |
Deepest position in landing | −88.8 | −3.4 | 82.0 | ± 85.4h | 0.45d [0.00;0.80] | 0.46d [0.00;0.81] |
Landing Impact | −37.7 | −1.6 | 34.4 | ± 36.0e | 0.54c [0.01;0.80] | 0.56c [0.01;0.82] |
Frontal Plane Projection Angle (°) | ||||||
Squats | ||||||
Maximum values | − 142.2 | −42.4 | 57.3 | ± 99.8h | 0.52c [0.06;0.91] | 0.63c [0.12;0.96] |
Minimum values | −90.3 | 30.6 | 151.5 | ±120.9h | 0.35d [0.00;0.98] | 0.38d [0.00;0.98] |
Deepest position in squat | −170.1 | −24.9 | 120.2 | ±145.2h | 0.57c [0.00;0.91] | 0.61c [0.00;0.95] |
Midpoint in descent | −16.3 | 1.5 | 19.2 | ± 17.8g | 0.84b [0.58;0.95] | 0.85b [0.62;0.98] |
Jumps | ||||||
Maximum values | −84.3 | −12.0 | 60.3 | ± 72.3h | 0.62c [0.00;0.97] | 0.66c [0.00;0.98] |
Minimum values | −53.3 | 15.9 | 85.0 | ± 69.2h | 0.44d [0.03;0.99] | 0.49c [0.05;1.00] |
Deepest position in landing | −158.3 | 14.8 | 187.8 | ±173.1h | 0.37d [0.00;0.94] | 0.39d [0.00;0.95] |
Landing Impact | −47.9 | −1.2 | 45.5 | ± 46.7h | 0.51c [0.00;0.83] | 0.53c [0.00;0.86] |
Hip Flexion (°) | ||||||
Squats | ||||||
Maximum values | −34.4 | 2.5 | 39.5 | ± 37.0h | 0.51c [0.00;0.86] | 0.53c [0.00;0.86] |
Minimum values | −34.4 | −5.8 | 22.7 | ± 28.5h | 0.47d [0.00;0.81] | 0.54c [0.00;0.91] |
Deepest position in squat | −32.1 | 3.9 | 40.0 | ± 36.0h | 0.49d [0.00;0.86] | 0.51c [0.00;0.87] |
Midpoint in descent | −29.8 | 0.7 | 31.2 | ± 30.5h | 0.60c [0.15;0.85] | 0.61c [0.16;0.87] |
Jumps | ||||||
Maximum values | −31.5 | 9.9 | 51.2 | ± 41.4h | 0.25d [0.00;0.62] | 0.32d [0.00;0.74] |
Minimum values | −26.6 | −2.7 | 21.2 | ± 23.9h | 0.53c [0.00;0.89] | 0.55c [0.00;0.90] |
Deepest position in landing | −27.6 | 12.8 | 53.2 | ± 40.4h | 0.50d [0.08;0.80] | 0.60c [0.10;0.91] |
Landing Impact | −21.5 | 14.8 | 51.1 | ± 36.3h | 0.32d [0.00;0.68] | 0.45d [0.00;0.86] |
Knee Flexion (°) | ||||||
Squats | ||||||
Maximum values | −23.6 | −11.7 | 0.2 | ± 11.9e | 0.83b [0.63;0.94] | 0.96a [0.89;0.99] |
Minimum values | −27.9 | −8.2 | 11.5 | ± 19.7g | 0.52c [0.10;0.79] | 0.68c [0.12;0.94] |
Deepest position in squat | −23.6 | −11.7 | 0.2 | ± 11.9e | 0.83b [0.63;0.94] | 0.96a [0.89;0.99] |
Midpoint in descent | −11.5 | −5.6 | 0.3 | ± 5.9e | 0.84b [0.64;0.94] | 0.96a [0.89;0.99] |
Jumps | ||||||
Maximum values | −25.7 | −5.6 | 14.6 | ± 20.1g | 0.85b [0.63;0.96] | 0.89b [0.68;0.97] |
Minimum values | −23.2 | −6.4 | 10.4 | ± 16.8f | 0.55c [0.15;0.81] | 0.66c [0.21;0.90] |
Deepest position in landing | −23.6 | −7.2 | 9.3 | ± 16.5f | 0.91a [0.76;0.98] | 0.94a [0.83;0.99] |
Landing Impact | −25.8 | −2.1 | 21.6 | ± 23.7h | 0.74c [0.15;0.96] | 0.76b [0.15;0.97] |
Knee Hip Separation Distance Ratio (ratio) | ||||||
Squats | ||||||
Maximum values | −0.44 | −0.03 | 0.38 | ± 0.41e | 0.93a [0.82;0.99] | 0.93a [0.82;0.99] |
Minimum values | −0.18 | 0.08 | 0.34 | ± 0.26e | 0.76b [0.53;0.94] | 0.82b [0.62;0.96] |
Deepest position in squat | −0.39 | − 0.01 | 0.41 | ± 0.40e | 0.94a [0.86;0.99] | 0.95a [0.86;0.99] |
Midpoint in descent | −0.39 | −0.01 | 0.41 | ± 0.40e | 0.88b [0.63;0.98] | 0.89b [0.67;0.98] |
Jumps | ||||||
Maximum values | −0.50 | − 0.01 | 0.47 | ± 0.48e | 0.87b [0.63;0.97] | 0.88b [0.64;0.97] |
Minimum values | −0.26 | 0.07 | 0.41 | ± 0.34e | 0.69c [0.29;0.91] | 0.73c [0.32;0.92] |
Deepest position in landing | −0.39 | 0.05 | 0.48 | ± 0.44e | 0.86b [0.52;0.97] | 0.87b [0.54;0.98] |
Landing Impact | −0.35 | 0.06 | 0.47 | ± 0.41e | 0.89b [0.61;0.99] | 0.90b [0.64;0.99] |
Knee Varus (°) | ||||||
Squats | ||||||
Maximum values | −27.6 | −6.5 | 14.7 | ± 21.1g | 0.30d [0.00;0.66] | 0.38d [0.00;0.73] |
Minimum values | −19.5 | −0.7 | 18.1 | ± 18.8g | 0.45d [0.00;0.78] | 0.46d [0.00;0.80] |
Deepest position in squat | −37.3 | −8.0 | 21.2 | ± 29.2h | 0.29d [0.00;0.72] | 0.34d [0.00;0.78] |
Midpoint in descent | −37.4 | −5.7 | 26.0 | ± 31.7h | 0.33d [0.00;0.70] | 0.38d [0.00;0.81] |