scholarly journals Abdominal Muscle Response During Curl-ups on Both Stable and Labile Surfaces

2000 ◽  
Vol 80 (6) ◽  
pp. 564-569 ◽  
Author(s):  
Francisco J Vera-Garcia ◽  
Sylvain G Grenier ◽  
Stuart M McGill
Keyword(s):  
Control System ◽  
Muscle Activity ◽  
Abdominal Muscle ◽  
Oblique Muscle ◽  
Low Back ◽  
Rectus Abdominis Muscle ◽  
External Oblique Muscle ◽  
Motor Control System ◽  
The Subject ◽  
External Oblique

Abstract Background and Purpose. With the current interest in stability training for the injured low back, the use of labile (movable) surfaces, underneath the subject, to challenge the motor control system is becoming more popular. Little is known about the modulating effects of these surfaces on muscle activity. The purpose of this study was to establish the degree of modulating influence of the type of surface (whether stable or labile) on the mechanics of the abdominal wall. In this study, the amplitude of muscle activity together with the way that the muscles coactivated due to the type of surface under the subject were of interest. Subjects. Eight men (mean age=23.3 years [SD=4.3], mean height=177.6 cm [SD=3.4], mean weight=72.6 kg [SD=8.7]) volunteered to participate in the study. All subjects were in good health and reported no incidence of acute or chronic low back injury or prolonged back pain prior to this experiment. Methods. All subjects were requested to perform 4 different curl-up exercises—1 on a stable surface and the other 3 on varying labile surfaces. Electromyographic signals were recorded from 4 different abdominal sites on the right and left sides of the body and normalized to maximal voluntary contraction (MVC) amplitudes. Results. Performing curl-up exercises on labile surfaces increased abdominal muscle activity (eg, for curl-up on a stable surface, rectus abdominis muscle activity was 21% of MVC and external oblique muscle activity was 5% of MVC; for curl-up with the upper torso on a labile ball, rectus abdominis muscle activity was 35% of MVC and external oblique muscle activity was 10% of MVC). Furthermore, it appears that increases in external oblique muscle activity were larger than those of other abdominal muscles. Conclusion and Discussion. Performing curl-ups on labile surfaces changes both the level of muscle activity and the way that the muscles coactivate to stabilize the spine and the whole body. This finding suggests a much higher demand on the motor control system, which may be desirable for specific stages in a rehabilitation program.

scholarly journals Quantification of the Differences in Electromyographic Activity Magnitude Between the Upper and Lower Portions of the Rectus Abdominis Muscle During Selected Trunk Exercises

2001 ◽  
Vol 81 (5) ◽  
pp. 1096-1101 ◽  
Author(s):  
Gregory J Lehman ◽  
Stuart M McGill
Keyword(s):  
Muscle Activity ◽  
Abdominal Muscle ◽  
Rectus Abdominis ◽  
Oblique Muscle ◽  
Emg Activity ◽  
Electromyographic Activity ◽  
Rectus Abdominis Muscle ◽  
Emg Signal ◽  
External Oblique Muscle ◽  
External Oblique

Abstract Background and Purpose. Controversy exists around exercises and clinical tests that attempt to differentially activate the upper or lower portions of the rectus abdominis muscle. The purpose of this study was to assess the activation of the upper and lower portions of the rectus abdominis muscle during a variety of abdominal muscle contractions. Subjects. Subjects (N=11) were selected from a university population for athletic ability and low subcutaneous fat to optimize electromyographic (EMG) signal collection. Methods. Controlling for spine curvature, range of motion, and posture (and, therefore, muscle length), EMG activity of the external oblique muscle and upper and lower portions of rectus abdominis muscle was measured during the isometric portion of curl-ups, abdominal muscle lifts, leg raises, and restricted or attempted leg raises and curl-ups. A one-way repeated-measures analysis of variance was used to test for differences in activity between exercises in the external oblique and rectus abdominis muscles as well as between the portions of the rectus abdominis muscle. Results. No differences in muscle activity were found between the upper and lower portions of the rectus abdominis muscle within and between exercises. External oblique muscle activity, however, showed differences between exercises. Discussion and Conclusion. Normalizing the EMG signal led the authors to believe that the differences between the portions of the rectus abdominis muscle are small and may lack clinical or therapeutic relevance.

scholarly journals Slow Expiration Reduces External Oblique Muscle Activity during Maximum Trunk Flexion

2014 ◽  
Vol 26 (12) ◽  
pp. 1919-1921 ◽  
Author(s):  
Hiroshi Ishida ◽  
Saya Tajima ◽  
Riyo Masuno ◽  
Yoshiko Kogame ◽  
Suguru Ando ◽  
...  
Keyword(s):  
Muscle Activity ◽  
Oblique Muscle ◽  
Trunk Flexion ◽  
External Oblique Muscle ◽  
External Oblique

Lumbar and abdominal muscle activity during walking in subjects with chronic low back pain: Support of the “guarding” hypothesis?

2010 ◽  
Vol 20 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Marije van der Hulst ◽  
Miriam M. Vollenbroek-Hutten ◽  
Johan S. Rietman ◽  
Hermanus J. Hermens
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Chronic Low Back Pain ◽  
Muscle Activity ◽  
Abdominal Muscle ◽  
Low Back

Sphincteroplasty with aponeurosis

1927 ◽  
Vol 23 (4) ◽  
pp. 467-467
Author(s):  
I. Tsimkhes
Keyword(s):  
Inguinal Hernia ◽  
Operative Treatment ◽  
Oblique Muscle ◽  
Medial Side ◽  
External Oblique Muscle ◽  
External Oblique

After the examination of sphincteroplasty as a method of operative treatment of inguinal hernia, Bleek, based on his own experience (12 cases), suggests that after exposing the aponeurosis of the external oblique muscle, it should be dissected in the usual way, making two parallel incisions immediately next to the pouparticular ligament and on the medial side.

scholarly journals A rare case of Spigelian hernia penetrating the external oblique muscle

2013 ◽  
Vol 2 (2) ◽  
Author(s):  
T Mariolis-Sapsakos ◽  
V Kalles ◽  
I Papapanagiotou ◽  
A Mekras ◽  
K Birbas ◽  
...  
Keyword(s):  
Rare Case ◽  
Spigelian Hernia ◽  
Oblique Muscle ◽  
External Oblique Muscle ◽  
External Oblique

The Effects of Lifting Posture on Trunk Muscle Activity

1992 ◽  
Vol 36 (10) ◽  
pp. 742-746
Author(s):  
Christopher A. Hamrick ◽  
Sean Gallagher
Keyword(s):  
Muscle Activity ◽  
Latissimus Dorsi ◽  
Trunk Muscle ◽  
Trunk Muscles ◽  
Oblique Muscle ◽  
Left And Right ◽  
External Oblique ◽  
Four Levels ◽  
The Right ◽  
Guidelines And Recommendations

Trunk muscle activity of twelve healthy males with coal mining experience was examined while each subject lifted a box under various conditions. The independent variables were four levels of posture (kneeling, stooped under a 1.2 m roof, stooped under a 1.6 m roof, and standing), height to which the box was lifted (35 cm or 70 cm), and weight of the lifting box (15 kg, 20 kg, or 25 kg). The dependent variables were the peak EMG values recorded during a lift for each of eight trunk muscles (left and right erectores spinae, left and right latissimus dorsi, left and right external oblique, and left and right rectus abdominis). Posture and weight of lift significantly affected peak activity of the left and right erectores spinae, the left and right latissimus dorsi muscles, and the right external oblique muscle. The latissimus dorsi muscle activity was highest in the low stooping posture, and was lowest in the kneeling posture, while erectores spinae activity was highest in the kneeling posture and decreased as the trunk became more flexed. Thus, the muscle activity during lifting tasks is affected by restricting a worker's posture. Consequently, many lifting guidelines and recommendations currently in use may not be directly applicable to work being performed in restricted postures.

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