Muscle activity in upper and lower rectus abdominus during abdominal exercises

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      Objective: To compare the intensity of the upper versus lower rectus abdominis (RA) muscle activity provoked by each of two different abdominal exercises and to contrast the intensity of contraction elicited by two different abdominal exercises on each RA muscle portion.
      Design: Nonrandomized control trial.
      Setting: Kinesiology laboratory in a university medicine faculty.
      Participants: Convenience sample of 33 healthy volunteers. Subjects who had practiced endurance or strength training activities (1.5 hours 3 days a week for 3 years) and those who had not accomplished that criterion comprised a high and a low physical activity group, respectively. Each of these two groups was divided by the ability to perform the exercises into two subgroups: correct and incorrect performers (cp, ic).
      Main Outcome Measure: Average surface iEMG was compared between upper and lower RA and on each muscle portion performing curl-up (CU) and posterior pelvic tilt (PT) exercises. The coefficient of variation, a two-way analysis of variance, and the t test were calculated.
      Results: The upper RA showed significantly greater activity during performance of CU exercise by the cp subgroups of both high (t = 2.14302, 95%) and low (t = 2.35875, 95%) activity groups. Only the cp subgroup of the high activity group showed that PT was significantly more strenuous than CU exercise on lower RA (t = -2.06467, 95%).
      Conclusions: Among correct performers, CU produces greater activity on upper RA. For persons who have a high level of activity, PT is more strenuous than CU on lower RA. Among incorrect performers, either exercise indistinctly activates the muscle portions.


        • Guimaraes ACS
        • Vaz MA
        • De campos MIA
        • Marantes R
        The contribution of the rectus femoris in twelve selected abdominal exercises.
        in: An electromyographic study. 2nd ed. J Sports Med Phys Fitness. 31. 1991: 222-230
      1. Williams PL Warwick R Gray's Anatomy. Salvat, Barcelona1985
      2. Palastanga N Field D Soames R Anatomy and Human Movement. Heinemann Medical Books, London1989
      3. Rouviere H Delmas A Anatomia Humana. 2nd ed. Descriptiva, topografica y funcional. Masson, Barcelona1987
      4. Moore KL Anatomia con orientación clinica. Medica Panamericana SA, Madrid1986
        • Floyd W
        • Silver P
        Electromyographic study of the anterior abdominal wall muscles in man.
        J Anat. 1950; 84: 132-145
        • Patridge MJ
        • Walters CE
        Participation of the abdominal muscles in various movements of the trunk in man.
        in: An electromyographic study. 2nd ed. Phys Ther Rev. 39. 1959: 791-800
        • Flint MM
        • Gudgell J
        Electromyographic study of abdominal muscular activity during exercise.
        Res Quart. 1965; 36: 29-37
        • Bankoff ADP
        • Furlani J
        Electromyographic study of the rectus abdominis and external oblique muscles during exercises.
        Electromyogr Clin Neurophysiol. 1984; 24: 501-510
        • Lipetz S
        • Gutin B
        An electromyographic study of four abdominal exercises.
        Med Sci Sports. 1970; 2: 35-38
        • Sheffiled FJ
        • Major MD
        Electromyographic study of the abdominal muscles in walking and other movements.
        Am J Phys Med. 1962; 4: 143-147
      5. Monfort M, Sarti MA, Sanchis C. Actividad eléctrica del músculo recto mayor del abdomen en ejercicios abdominales. Estudio cualitativo. Apunts de Medicina deportiva. In press.

        • Carman DJ
        • Blanton PL
        • Biggs NL
        Electromyographic study of the anterolateral abdominal Musculature utilizing indwelling electrodes.
        Am J Phys Med. 1972; 51: 113-129
        • Richardson CW
        • Jull R
        • Toppenberg
        • Comerford M
        Techniques for active lumbar stabilization for spinal protection: a pilot study.
        Aust Physother. 1992; 38: 105-112
        • Gutin B
        • Lipetz S
        An electromyographic investigation of the rectus abdominis in abdominal exercises.
        Res R Am Assoc Health Phys. 1971; 42: 256-263
        • Anderson AB
        • Champion SHS
        Skin preparation for surface EMG.
        in: Proceedings of the Bicentennial National APA Conference, 1988; Canberra, Australia1988: 11-29
        • Clarys JP
        Hydrodinamycs and electromyography: ergonomics aspects in aquatics.
        Appl Ergonomics. 1983; 16: 11-24
        • Clarys JP
        A Review of EMG in swimming, explanation of facts and/or feedback information.
        in: 2nd ed. Swimming Science IV. Human Kinetics, Champaign (IL)1985: 123-145
        • Clarys JP
        • Cabri J
        Electromyography and the study of sports movements: a review.
        J Sports Sci. 1993; 11: 379-448
        • Halpern AA
        • Bleck EE
        Sit up exercises: an electromyographyc study.
        Clin Orthop. 1979; 172: 172-178
        • Godfrey KE
        • Kinding LE
        • Windell EJ
        Electromyographic study of duration muscle activity in sit ups variations.
        Arch Phys Med Rehabil. 1977; 58: 132-135
        • Moritani T
        Neuromuscular adaptations during the acquisition of muscle strength, power and motor tasks.
        J Biomech. 1993; 26: 95S-107S
      6. Nachemsom A Elfström G Intravital dynamic pressure measurements in lumbar discs. Almqvist & Wiksell, Stockholm1970
        • Neeves R
        • Narlow D
        Torque, work and power differences in bentknee and straight situps in women [abstract].
        Med Sci Sports. 1975; 7: 77
        • Ricci B
        • Marchetti M
        • Figura F
        Biomechanichs of sit up exercises.
        Med Sci Sports Exer. 1981; 13: 54-59
        • Ekholm J
        • Arborelius U
        • Fahlcrantz A
        • Larsson AM
        • Mattson G
        Activation of abdominal muscles during some physiotherapeutic exercises.
        Scand J Rehabil Med. 1979; 11: 75-84