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
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8903730/
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,
: Effects of arm and leg positions on lumbar multifidus muscle activity while on hands and knees or while standing – Methods
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.
Methods
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.
Results
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.
Conclusions
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.
: Effects of arm and leg positions on lumbar multifidus muscle activity while on hands and knees or while standing – Results
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Dr. Rodolfo Alfonso, D.C.
Dr. Mark N. Berry, D.C.
Sunset Chiropractic and Wellness
8585 Sunset Dr.
STE 102
Miami, Florida 33143
305-275-7474
www.sunsetchiropractor.com
