Implicit video feedback produces positive changes in landing mechanics

Popovic, Tijana; Caswell, Shane V.; Benjaminse, Anne; Siragy, Tarique; Ambegaonkar, Jatin; Cortes, Nelson

doi:10.1186/s40634-018-0129-5

Journal of Experimental Orthopaedics

Table 2 Descriptive statistics for all dependent measures by group across testing periods measured at initial contact

From: Implicit video feedback produces positive changes in landing mechanics

Box Drop-Jump Task	Pretest		Posttest 1		Posttest 2		Posttest 3		Retention
Box Drop-Jump Task	Mean ± SD	95% CI	Mean ± SD	95% CI	Mean ± SD	95% CI	Mean ± SD	95% CI	Mean ± SD	95% CI
HF (°)
IG	32.6 ± 12.4	26, 39.2	35 ± 10.4	28.7, 41.2	36.9 ± 11.2	30.5, 43.4	38.5 ± 13.9	30.9, 46	31.8 ± 16.3	24.2, 39.5
EG	31.8 ± 9.6	25.2, 38.4	34.1 ± 10.1	27.9, 40.4	35.9 ± 9	29.4, 42.3	37.2 ± 11.4	29.6, 44.8	34.9 ± 6.8	27.3, 42.5
CG	34.1 ± 7.9	27.5, 40.7	36.9 ± 8.1	30.6, 43.1	37.9 ± 9.6	31.4, 44.4	38 ± 9.3	30.5, 45.6	35.6 ± 10.1	27.9, 43.2
HA (°)
IG	−6.78 ± 3.6	−9.8, −3.8	−5.7 ± 2.6	−8.2, − 3.3	− 6.7 ± 5	− 9.9, − 3.6	−7.9 ± 5.3	−11.4, − 4.4	− 6.5 ± 3.9	−9.7, − 3.3
EG	− 9.2 ± 4.8	− 12.2, − 6.2	− 8.4 ± 4.5	−10.8, − 6	−9.8 ± 2.8	− 12.9, − 6.6	−9.2 ± 4	−12.8, − 5.7	− 10.6 ± 4.5	− 13.8, − 7.4
CG	− 8.7 ± 5.3	− 11.7, − 5.7	− 8.4 ± 3.7	−10.8, − 6	−7.3 ± 6.2	−10.5, − 4.2	−7.8 ± 6.7	−11.3, − 4.3	−7.5 ± 6.2	−10.7, − 4.3
HAM (Nm/kg)
IG	0.003 ± 0.4	−0.3, 0.3	0.1 ± 0.4	− 0.2, 0.3	0.01 ± 0.4	− 0.3, 0.3	0.1 ± 0.4	− 0.1, 0.3	0.01 ± 0.4	− 0.2, 0.2
EG	0.03 ± 0.4	−0.2, 0.3	−0.1 ± 0.3	− 0.3, 0.1	−0.1 ± 0.5	− 0.4, 0.2	− 0.1 ± 0.4	− 0.3, 0.1	0.1 ± 0.2	− 0.1, 0.3
CG	0.2 ± 0.4	− 0.03, 0.5	− 0.2 ± 0.3	− 0.4, 0.1	0.03 ± 0.3	− 0.2, 0.3	0.1 ± 0.2	− 0.1, 0.3	0.01 ± 0.3	− 0.2, 0.2
KF (°)
IG	−28.4 ± 6.7	− 33.2, − 23.6	− 29 ± 7.8	− 33.7, − 24.4	− 31.6 ± 10.5	− 37.3, − 26	−29.8 ± 10.2	−35.5, − 24.1	−29.5 ± 11.2	−36, − 23.1
EG	− 29 ± 7.4	− 33.8, − 24.1	−31.9 ± 7.2	− 36.5, − 27.3	−30.5 ± 5.1	− 36.1, − 24.8	−30.6 ± 7.5	− 36.3, − 24.9	−30.4 ± 9.4	− 36.8, − 23.9
CG	− 30.3 ± 8.2	− 35.1, − 25.4	− 31.8 ± 6.3	− 36.5, − 27.2	−32 ± 9.5	− 37.7, − 26.4	−32 ± 8.3	− 37.6, − 26.3	−32 ± 9.2	− 38.6, − 25.5
KA (°)
IG	1 ± 2.7	−1.2, 3.1	0.7 ± 2.7	−1.6, 3.1	0.6 ± 1.8	−1.6, 2.7	1.7 ± 3.2	−0.3, 3.7	0.9 ± 1.4	−1.1, 3
EG	0.8 ± 3.9	−1.4, 3	0.4 ± 4.4	−2, 2.4	1.3 ± 4	0.8, 3.4	2.3 ± 2.8	0.3, 4.3	0.6 ± 2.8	−1.5, 2.6
CG	0.2 ± 3.4	−2, 2.4	−0.5 ± 3.5	− 2.6, 1.9	1.1 ± 3.6	−1, 3.2	1.2 ± 3.3	−0.8, 3.2	0.5 ± 4.4	−1.6, 2.5
KAM (Nm/kg)
IG	0.03 ± 0.2	−0.1, 0.2	0.1 ± 0.2	−0.1, 0.2	0.03 ± 0.2	−0.1, 0.2	0.1 ± 0.2	−0.1, 0.2	0.03 ± 0.3	−0.1, 0.2
EG	−0.05 ± 0.2	−0.2, 0.1	− 0.1 ± 0.2	−0.2, 0.01	− 0.1 ± 0.2	−0.2, 0.04	− 0.1 ± 0.2	−0.2, 0.04	− 0.02 ± 0.1	−0.2, 0.1
CG	0.03 ± 0.2	−0.1, 0.2	−0.1 ± 0.1	− 0.2, 0.01	0.003 ± 0.1	− 0.1, 0.1	0.04 ± 0.2	− 0.1, 0.2	−0.02 ± 0.2	− 0.2, 0.1

Mean ± standard deviation (SD) and 95% confidence intervals (CI)
Hip flexion (HF), hip abduction (HA), hip abduction moment (HAM), knee flexion (KF), knee abduction (KA), knee abduction moment (KAM)
Implicit group (IG), explicit group (EG), Control group (CG)

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