Electromyographic activity of the trunk extensor muscles: Effect of varying hip position and lumbar posture during Roman chair exercise John M. Mayer,

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Presentation transcript:

Electromyographic activity of the trunk extensor muscles: Effect of varying hip position and lumbar posture during Roman chair exercise John M. Mayer, DC, PhD, Joe L. Verna, DC, Todd M. Manini, MS, Vert Mooney, MD, James E. Graves, PhD Archives of Physical Medicine and Rehabilitation Volume 83, Issue 11, Pages 1543-1546 (November 2002) DOI: 10.1053/apmr.2002.35103 Copyright © 2002 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig. 1 Diagram of the angle settings on the VARC. Figure shows subject at 45° of trunk extension with the VARC positioned at 45°. Archives of Physical Medicine and Rehabilitation 2002 83, 1543-1546DOI: (10.1053/apmr.2002.35103) Copyright © 2002 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig. 2 Dynamic trunk extension exercise on a VARC with surface electrodes attached to the subject. Archives of Physical Medicine and Rehabilitation 2002 83, 1543-1546DOI: (10.1053/apmr.2002.35103) Copyright © 2002 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig. 3 Trunk extensor muscle surface electromyographic activity during Roman chair exercise: effect of hip position. Values are means ± SEs (N=12). Legend: ●, internal hip rotation; ●, external hip rotation. *Internal hip rotation is greater than external hip rotation (P≤.05). Archives of Physical Medicine and Rehabilitation 2002 83, 1543-1546DOI: (10.1053/apmr.2002.35103) Copyright © 2002 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig. 4 Trunk extensor muscle surface electromyographic activity during Roman chair exercise: effect of lumbar posture. Values are means ± SEs (N=12). Legend: ●, biphasic posture; ●, nonbiphasic posture. *Biphasic greater than nonbiphasic (P≤.05). Archives of Physical Medicine and Rehabilitation 2002 83, 1543-1546DOI: (10.1053/apmr.2002.35103) Copyright © 2002 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions