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Table 2 Mean muscle activity (± standard deviation) for each muscle during the four extension exercises (%MVC)

From: Posterior muscle chain activity during various extension exercises: an observational study

   LD LTT ILT LTL ILL LM GM
  Dyn trunk 27.38 ± 6.94 79.03 ± 31.51 64.12 ± 20.72 89.07 ± 19.49 91.47 ± 25.60 78.69 ± 23.88 44.87 ± 30.03
Concentric phase Dyn-stat trunk 19.43 ± 2.73 69.64 ± 14.57 77.87 ± 23.19 86.90 ± 29.9 75.04 ± 28.92 82.00 ± 30.57 38.18 ± 23.18
Dyn leg 9.72 ± 3.44 67.84 ± 20.68 62.95 ± 10.26 75.24 ± 20.82 88.25 ± 21.64 55.39 ± 8.57 30.33 ± 16.18
  Dyn-stat leg 22.64 ± 11.01 81.93 ± 26.91 63.16 ± 31.14 81.36 ± 17.54 79.60 ± 22.21 65.10 ± 36.65 43.25 ± 19.38
  Dyn trunk N.A. N.A. N.A. N.A. N.A. N.A. N.A.
Isometric phase Dyn-stat trunk 19.30 ± 2.10 69.92 ± 26.48 74.05 ± 21.64 81.54 ± 25.49 70.12 ± 27.10 70.23 ± 29.52 35.49 ± 12.99
Dyn leg N.A. N.A. N.A. N.A. N.A. N.A. N.A.
  Dyn-stat leg 20.56 ± 11.63 66.23 ± 31.16 61.15 ± 27.07 77.00 ± 19.56 72.73 ± 21.67 65.77 ± 30.66 35.27 ± 30.29
  Dyn trunk 26.57 ± 7.09 52.67 ± 22.15 50.19 ± 15.19 59.45 ± 17.29 57.94 ± 15.53 62.35 ± 24.44 33.09 ± 15.25
Eccentric phase Dyn-stat trunk 19.06 ± 3.97 60.17 ± 27.79 44.02 ± 15.61 57.56 ± 23.71 66.57 ± 23.00 56.15 ± 30.65 29.38 ± 19.62
Dyn leg 9.84 ± 3.51 46.84 ± 14.60 44.22 ± 10.42 49.81 ± 19.81 53.20 ± 17.70 53.21 ± 34.36 20.33 ± 9.56
  Dyn-stat leg 20.85 ± 7.51 54.76 ± 10.05 51.16 ± 26.47 48.03 ± 11.03 47.71 ± 15.60 58.59 ± 30.25 14.94 ± 9.59
  1. LD lattisimus dorsi, LTT longissimus thoracis pars thoracic, LTL longissimus thoracis pars lumborum, ILT Ilioctalis lumborum pars thoracis, ILL Iliocostalis Lumborum pars Lumborum, LM Lumbar Multifidus, GM Gluteus maximus.
  2. N.A Data Not available.