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Table 2 Mean and standard deviation, 95 % CI of EMG activity of the VMO and VL muscles

From: Vastus medialis oblique and vastus lateralis activity during a double-leg semisquat with or without hip adduction in patients with patellofemoral pain syndrome

  VL VMO
  MF(Hz) MPF(Hz) RMS(μV) IEMG(μVs) MF(Hz) MPF(Hz) RMS(μV) IEMG(μVs)
DS* 56.66 ± 5.53 68.14 ± 6.38 103.31 ± 44.54 8.02 ± 3.45 55.88 ± 5.17 65.57 ± 4.96b 85.02 ± 41.19b 6.72 ± 3.20b
(54.60–58.72) (65.76–70.52) (86.68–119.94) (6.73–9.30) (53.95–58.72) (62.72–66.42) (69.64–100.40) (5.53–7.92)
DS-HA* 57.21 ± 4.93 67.79 ± 5.83 113.00 ± 41.08 8.82 ± 3.15 56.51 ± 5.97 65.47 ± 6.08 105.81 ± 44.23a 8.30 ± 3.55a
(55.37–59.05) (65.61–69.96) (97.66–128.34) (7.65–9.99) (54.27–58.74) (63.20–67.74) (89.30–122.33) (6.98–9.63)
DS** 56.45 ± 5.99 68.30 ± 7.64 99.25 ± 31.14 7.83 ± 2.48 56.68 ± 6.45 66.53 ± 7.56 104.10 ± 48.75 8.27 ± 3.81
(54.90–58.00) (66.33–70.27) (91.21–107.29) (7.19–8.48) (55.02–58.35) (64.58– 68.49) (91.51–116.70) (7.25–9.25)
DS-HA** 56.58 ± 6.01 68.10 ± 7.94 103.18 ± 40.55 8.13 ± 3.25 56.50 ± 6.45 66.45 ± 7.92 109.50 ± 63.47 8.63 ± 4.97
(55.03–58.14) (66.05–70.15) (92.71–113.66) (7.29–8.97) (54.83–58.17) (64.40–68.50) (93.10–125.90) (7.35–9.92)
  1. DS double-leg semisquat exercise, DS-HA double-leg semisquat exercise with hip adduction
  2. 95 % CI 95 % confidence intervals
  3. *PFPS subjects **healthy subjects
  4. aElectric activity of the VMO muscles was significantly greater during DS-HA exercise than during DS exercise (P < 0.05)
  5. bElectric activity of the VL muscle was significantly greater than that of the VMO muscle during DS exercise (P < 0.05)
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