1 Kibler WB, "The role of core stability in athletic function" 36 : 189-198, 2006
2 Yoon TL, "Slow expiration reduces sternocleidomastoid activity and increases transversus abdominis and internal oblique muscle activity during abdominal curl-up" 24 : 228-232, 2014
3 Marchetti PH, "Selective activation of the rectus abdominis muscle during low-intensity and fatiguing tasks" 10 : 322-327, 2011
4 Willett GM, "Relative activity of abdominal muscles during commonly prescribed strengthening exercises" 15 : 480-485, 2001
5 Djordjevic O, "Relationship between electromyographic signal amplitude and thickness change of the trunk muscles in patients with and without low back pain" 31 : 893-902, 2015
6 Lehman GJ, "Quantification of the differences in electromyographic activity magnitude between the upper and lower portions of the rectus abdominis muscle during selected trunk exercises" 81 : 1096-1101, 2001
7 Duncan M., "Muscle activity of the upper and lower rectus abdominis during exercises performed on and off a Swiss ball" 13 : 364-367, 2009
8 Sarti MA, "Muscle activity in upper and lower rectus abdominus during abdominal exercises" 77 : 1293-1297, 1996
9 Hodges PW, "Measurement of muscle contraction with ultrasound imaging" 27 : 682-692, 2003
10 Clark KM, "Electromyographic comparison of the upper and lower rectus abdominis during abdominal exercises" 17 : 475-483, 2003
1 Kibler WB, "The role of core stability in athletic function" 36 : 189-198, 2006
2 Yoon TL, "Slow expiration reduces sternocleidomastoid activity and increases transversus abdominis and internal oblique muscle activity during abdominal curl-up" 24 : 228-232, 2014
3 Marchetti PH, "Selective activation of the rectus abdominis muscle during low-intensity and fatiguing tasks" 10 : 322-327, 2011
4 Willett GM, "Relative activity of abdominal muscles during commonly prescribed strengthening exercises" 15 : 480-485, 2001
5 Djordjevic O, "Relationship between electromyographic signal amplitude and thickness change of the trunk muscles in patients with and without low back pain" 31 : 893-902, 2015
6 Lehman GJ, "Quantification of the differences in electromyographic activity magnitude between the upper and lower portions of the rectus abdominis muscle during selected trunk exercises" 81 : 1096-1101, 2001
7 Duncan M., "Muscle activity of the upper and lower rectus abdominis during exercises performed on and off a Swiss ball" 13 : 364-367, 2009
8 Sarti MA, "Muscle activity in upper and lower rectus abdominus during abdominal exercises" 77 : 1293-1297, 1996
9 Hodges PW, "Measurement of muscle contraction with ultrasound imaging" 27 : 682-692, 2003
10 Clark KM, "Electromyographic comparison of the upper and lower rectus abdominis during abdominal exercises" 17 : 475-483, 2003
11 Kim MH, "Effects of performing an abdominal hollowing exercise on trunk muscle activity during curl-up exercise on an unstable surface" 27 : 501-503, 2015
12 Ferreira PH, "Discriminative and reliability analyses of ultrasound measurement of abdominal muscles recruitment" 16 : 463-469, 2011
13 Ishida H, "Comparison of changes in the contraction of the lateral abdominal muscles between the abdominal drawing-in maneuver and breathe held at the maximum expiratory level" 17 : 427-431, 2012
14 Ferreira PH, "Changes in recruitment of the abdominal muscles in people with low back pain: ultrasound measurement of muscle activity" 29 : 2560-2566, 2004
15 Rankin G, "Abdominal muscle size and symmetry in normal subjects" 34 : 320-326, 2006
16 Urquhart DM, "Abdominal muscle recruitment during a range of voluntary exercises" 10 : 144-153, 2005
17 Critchley DJ, "Abdominal muscle function in chronic low back pain patients: measurement with real-time ultrasound scanning" 88 : 322-332, 2002
18 Stokes IA, "Abdominal muscle activation increases lumbar spinal stability:analysis of contributions of different muscle groups" 26 : 797-803, 2011