08 Apr Sunset Chiropractic & Research Review: Effects of arm and leg positions on lumbar multifidus muscle activity while on hands and knees or while standing
“The results suggest that unilateral 90° shoulder joint abduction and contralateral hip joint abduction in the hands-and-knees and standing positions may produce selective and significant contraction of the LMF muscle.”
“This is why we treat the entire spine and extremities with a focus of improving the entire system ” – Dr. Alfonso and Dr. Berry
The lumbar multifidus (LMF) muscle, which is involved in the mechanical stability of the lumbar spine, reportedly undergoes atrophy in patients with low back pain. Preventing or mitigating low back pain requires strengthening the LMF muscle; however, methods for triggering selective and significant contraction of this muscle have not been fully studied. This study aims to clarify how,
in the hands-and-knees or standing position, the position of the arm and leg on one side affects the activity of the lumbar erector spinae (LES) and LMF muscles.
We recruited nine adult men with no prior history of low back pain. Measurements were taken in four different postures under varying conditions (that is, one arm and one leg were lifted in either the hands-and-knees or standing position,) as follows: (1) shoulder joint flexion and hip joint extension in the hands-and-knees position; (2) 90° shoulder joint abduction and hip joint abduction in the hands-and-knees position; (3) shoulder joint flexion and hip joint extension in the standing position; and (4) 90° shoulder joint abduction and hip joint abduction in the standing position. The 90° shoulder joint abduction involved simultaneous horizontal abduction, while the hip joint abduction involved simultaneous extension. Muscle activity of the LES and LMF in each posture was measured using a surface electromyograph.
Muscle activity of the LMF was significantly higher in 90° shoulder joint abduction and hip joint abduction than in shoulder joint flexion and hip joint extension in both the hands-and-knees and standing positions. The LES muscle showed no significant differences in activity between each posture.
The results suggest that unilateral 90° shoulder joint abduction and contralateral hip joint abduction in the hands-and-knees and standing positions may produce selective and significant contraction of the LMF muscle.
At Sunset Chiropractic & Wellness nonsurgical drugless spinal and extremity treatments are selected and designed from a compressive consultation, health history, physical examination (orthopedic/neurological testing), digital posture analysis, weight bearing sitting x-rays using 41 measurements and 23 angles analyzing and comparing the spine to a mathematical model. In specific cases additional diagnostics could be ordered (Digital Motion X-rays/CTs/MRIs) to obtain or confirm a diagnosis.
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Sunset Chiropractic and Wellness’s Structural Correction Chiropractic Care rehabilitate the damaged spine/extremities and its damaged structures (muscles, ligaments, fascia, discs, bone, and nerves) improving the structure and functions, reducing and removing the pain, and improving overall quality of life.
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Dr. Rodolfo Alfonso, D.C.
Dr. Mark N. Berry, D.C.
Sunset Chiropractic and Wellness
8585 Sunset Dr.
Miami, Florida 33143