Acute Neuromuscular Activity in Selected Injury Prevention Exercises with App-Based versus Personal On-Site Instruction: A Randomized Cross-Sectional Study
Table 2
Normalized EMG and kinematics during exercises presented as mean (95% CI) in APP (n = 23) and PHY (n = 24) group, respectively.
One-leg balance on Airex
Drop jump
One-leg jump on the floor
One-leg jump on Airex
Kettlebell swing
APP
PHY
APP
PHY
APP
PHY
APP
PHY
APP
PHY
Biceps femoris (% EMGmax)
2 (0–11)
3 (0–12)
10 (0–19)
10 (1–19)
21 (11–30)
34 (25–43)
38 (29–46)
43 (34–51)
49 (40–58)
54 (46–62)
Semitendinosus (% EMGmax)
2 (0–9)
3 (0–10)
10 (1–18)
11 (3–18)
20 (11–28)
30 (22–38)§
32 (24–39)
49 (41–56)
41 (28–53)
60 (48–71)
Vastus lateralis (% EMGmax)
5 (0–17)
7 (0–19)
29 (15–43)
19 (7–31)
32 (18–47)
52 (39–65)
39 (27–52)
57 (45–70)
56 (42–70)
50 (38–62)
Vastus medialis (% EMGmax)
4 (0–13)
7 (0–15)
18 (9–28)
20 (11–28)
33 (24–42)
36 (27–45)
30 (21–38)
40 (32–49)§
51 (42–59)
50 (42–58)
Knee flexion angle at IC (°)
—
—
24 (22–27)
22 (20–25)
10 (8–13)
13 (10–15)
11 (9–14)
15 (12–17)
—
—
Knee flexion angle max (°)
—
—
85 (81–90)
90 (87–94)
53 (49–57)
57 (53–61)
51 (48–55)
55 (51–59)
55 (49–61)
42 (37–48)
Knee valgus angle at IC (°)
—
—
5 (4–6)
4 (3–5)
4 (3–5)
2 (1–3)
3 (2–4)
2 (1–3)
—
—
Knee valgus angle max (°)
—
—
2 (1–3)
0 (−1-1)
4 (2–5)
2 (1–3)
3 (2–4)
1 (0–2)
—
—
Hip flexion angle at IC (°)
—
—
31 (27–35)
32 (28–36)
36 (32–40)
41 (37–45)
40 (37–44)
44 (41–48)
—
—
Hip flexion angel max (°)
—
—
81 (75–86)
89 (85–94)
55 (50–60)
58 (53–63)
54 (50–59)
58 (53–62)
80 (74–86)
83 (78–89)
Hip internal rotation at IC (°)
—
—
−3 (−6–0)
−6 (−9–(−3))
−1 (−4–3)
−2 (−5–2)
2 (−1–5)
3 (−1–6)
—
—
Hip internal rotation max (°)
—
—
12 (9–15)
11 (8–14)
4 (1–7)
3 (0–6)
5 (2–8)
4 (2–7)
—
—
APP: group receiving app-based instruction. PHY: group receiving instruction from a physiotherapist. CI: confidence interval. IC: initial contact. Significance level at .§Significance level at .
