Influence of Upper Trapezius Fibers on Hand-behind-back Motion Elicited Using Electrical Stimulation

Shirai, Takanao; Ijiri, Tomohito; Suzuki, Toshiaki

doi:10.1589/rika.36.433

Cited by 1 publication

(1 citation statement)

References 11 publications

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“…In the slouching posture (slouching), they were instructed to round their body, assume a comfortable posture, and face the front. The upper limbs were positioned in two ways: drooped towards the body (drooping) and with the thumb held at the L5 spinous process (behind back), referencing previous studies 10 , 11 ) . Four conditions were established based on the spine and upper limb alignment in the sitting posture: condition 1 (erect and drooping), condition 2 (erect and behind back), condition 3 (slouching and drooping), and condition 4 (slouching and behind back) ( Fig.…”

Section: Participants and Methodsmentioning

confidence: 99%

Relationship between scapular elevation exercises with different alignments and activity of the trapezius and levator scapulae muscles

Ueda,

Nakamata,

Kakizaki

et al. 2023

J Phys Ther Sci

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[Purpose] This study aimed to examine whether scapular elevation exercises in sitting positions with different alignments lead to contractions of the trapezius and levator scapulae muscles. [Participants and Methods] The participants were 25 males, measured in four sitting positions with different alignments. Spine alignment was assessed by measuring the head protrusion, upper thoracic spine tilt, and pelvic tilt angles. Upper limb alignment was evaluated using the scapula tilt angle, scapula rotation angle, and distance between scapular spinous processes. Scapular elevation exercises were measured, and the thickness of the trapezius and levator scapulae muscles were measured in resting and elevated positions, with changes in muscle thickness. [Results] The trapezius muscle thickness was greater in the sitting position with less thoracic spine tilt and scapula tilt angles. Conversely, the levator scapulae muscle thickness was greater in the sitting position with more thoracic spine tilt and scapula tilt angles. [Conclusion] Scapular elevation exercises induce separate contractions of the trapezius and levator scapulae muscles by modifying the alignment of the spine and upper limbs.

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Section: Participants and Methodsmentioning

confidence: 99%