The functional role of the supraspinatus and infraspinatus muscle subregions during forward flexion: a shear wave elastography study
Background: Knowledge of the morphological and functional differences in the anatomic subregions of the supraspinatus (SSP) and infraspinatus (ISP) muscles during forward flexion will provide useful information in the management of shoulder joint disorders. The purpose of this study was to investiga...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-09-01
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| Series: | JSES International |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666638322001293 |
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| author | Kyosuke Hoshikawa, PT, MS Takuma Yuri, OT, PhD Hugo Giambini, PhD Nariyuki Mura, MD, PhD Yoshiro Kiyoshige, MD, PhD |
| author_facet | Kyosuke Hoshikawa, PT, MS Takuma Yuri, OT, PhD Hugo Giambini, PhD Nariyuki Mura, MD, PhD Yoshiro Kiyoshige, MD, PhD |
| author_sort | Kyosuke Hoshikawa, PT, MS |
| collection | DOAJ |
| description | Background: Knowledge of the morphological and functional differences in the anatomic subregions of the supraspinatus (SSP) and infraspinatus (ISP) muscles during forward flexion will provide useful information in the management of shoulder joint disorders. The purpose of this study was to investigate whether the SSP and ISP muscle subregions exhibit independent roles during forward flexion of the shoulder joint. Methods: Eight healthy male volunteers without any restriction in their shoulder joints were recruited for this study. Participants were instructed to sit on a chair with their back against the backrest. Shear modulus (kPa) was measured as a surrogate for muscle stiffness using shear wave elastography on the SSP and ISP muscle subregions. Active measurements of the nondominant arm were obtained during isometric contraction at a neutral position and every 15° intervals from 30° to 150° during forward flexion. Friedman test and Dunn's post hoc test were used to evaluate differences in measurement outcomes among angles during forward flexion in each muscle subregion. Results: Active stiffness outcomes of the anterior-middle subregion of the SSP muscle during forward flexion increased from 30° up to 45°, reaching a value of 182.4 ± 32.1 kPa (P < .001). Stiffness of the anterior-superficial subregion of the SSP muscle was highest at 30° (125.0 ± 20.6 kPa; P < .019) and linearly decreased up to 105° with increasing shoulder angle position. Stiffness of the superior, middle, and inferior subregions of ISP muscle presented a mountain-shaped trend, with peaks of 99.9 ± 23.5 kPa at 90° (P < .013), 144.2 ± 11.2 kPa at 90° (P < .013), and 122.9 ± 27.9 kPa at 105° (P < .007), respectively. Finally, the stiffness outcomes of the pectoralis major and anterior region of the deltoid muscles showed a mountain-shaped trend with peaks of 89.4 ± 23.5 kPa at 60° (P < .007) and 176.7 ± 22.9 kPa at 90° (P < .026), respectively. Conclusions: The SSP and ISP muscle subregions play a significant role during active forward flexion motion. While closely overlapped, the activity of the muscle subregions changed during the forward flexion motion range, starting with an active anterior-superficial subregion of the SSP muscle at the initial range of motion and an active inferior subregion of the ISP muscle toward midrange of motion. The SSP and ISP subregions did not demonstrate independent functional behavior during forward flexion. |
| first_indexed | 2024-04-13T01:59:54Z |
| format | Article |
| id | doaj.art-e3854f7cc8534b57902f3f8f9cb03140 |
| institution | Directory Open Access Journal |
| issn | 2666-6383 |
| language | English |
| last_indexed | 2024-04-13T01:59:54Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | JSES International |
| spelling | doaj.art-e3854f7cc8534b57902f3f8f9cb031402022-12-22T03:07:39ZengElsevierJSES International2666-63832022-09-0165849854The functional role of the supraspinatus and infraspinatus muscle subregions during forward flexion: a shear wave elastography studyKyosuke Hoshikawa, PT, MS0Takuma Yuri, OT, PhD1Hugo Giambini, PhD2Nariyuki Mura, MD, PhD3Yoshiro Kiyoshige, MD, PhD4Graduate School of Health Sciences, Yamagata Prefectural University of Health Sciences, Yamagata, Japan; Corresponding author: Kyosuke Hoshikawa, PT, MS, Graduate School of Health Sciences, Yamagata Prefectural University of Health Sciences, 260 Kamiyanagi, Yamagata 990-2212, Japan.Department of Biomedical Engineering and Chemical Engineering, The University of Texas at San Antonio, San Antonio, TX, USADepartment of Biomedical Engineering and Chemical Engineering, The University of Texas at San Antonio, San Antonio, TX, USAGraduate School of Health Sciences, Yamagata Prefectural University of Health Sciences, Yamagata, JapanGraduate School of Health Sciences, Yamagata Prefectural University of Health Sciences, Yamagata, JapanBackground: Knowledge of the morphological and functional differences in the anatomic subregions of the supraspinatus (SSP) and infraspinatus (ISP) muscles during forward flexion will provide useful information in the management of shoulder joint disorders. The purpose of this study was to investigate whether the SSP and ISP muscle subregions exhibit independent roles during forward flexion of the shoulder joint. Methods: Eight healthy male volunteers without any restriction in their shoulder joints were recruited for this study. Participants were instructed to sit on a chair with their back against the backrest. Shear modulus (kPa) was measured as a surrogate for muscle stiffness using shear wave elastography on the SSP and ISP muscle subregions. Active measurements of the nondominant arm were obtained during isometric contraction at a neutral position and every 15° intervals from 30° to 150° during forward flexion. Friedman test and Dunn's post hoc test were used to evaluate differences in measurement outcomes among angles during forward flexion in each muscle subregion. Results: Active stiffness outcomes of the anterior-middle subregion of the SSP muscle during forward flexion increased from 30° up to 45°, reaching a value of 182.4 ± 32.1 kPa (P < .001). Stiffness of the anterior-superficial subregion of the SSP muscle was highest at 30° (125.0 ± 20.6 kPa; P < .019) and linearly decreased up to 105° with increasing shoulder angle position. Stiffness of the superior, middle, and inferior subregions of ISP muscle presented a mountain-shaped trend, with peaks of 99.9 ± 23.5 kPa at 90° (P < .013), 144.2 ± 11.2 kPa at 90° (P < .013), and 122.9 ± 27.9 kPa at 105° (P < .007), respectively. Finally, the stiffness outcomes of the pectoralis major and anterior region of the deltoid muscles showed a mountain-shaped trend with peaks of 89.4 ± 23.5 kPa at 60° (P < .007) and 176.7 ± 22.9 kPa at 90° (P < .026), respectively. Conclusions: The SSP and ISP muscle subregions play a significant role during active forward flexion motion. While closely overlapped, the activity of the muscle subregions changed during the forward flexion motion range, starting with an active anterior-superficial subregion of the SSP muscle at the initial range of motion and an active inferior subregion of the ISP muscle toward midrange of motion. The SSP and ISP subregions did not demonstrate independent functional behavior during forward flexion.http://www.sciencedirect.com/science/article/pii/S2666638322001293Supraspinatus muscleInfraspinatus muscleMuscle subregionsForward flexionShear wave elastographyMuscle stiffness |
| spellingShingle | Kyosuke Hoshikawa, PT, MS Takuma Yuri, OT, PhD Hugo Giambini, PhD Nariyuki Mura, MD, PhD Yoshiro Kiyoshige, MD, PhD The functional role of the supraspinatus and infraspinatus muscle subregions during forward flexion: a shear wave elastography study JSES International Supraspinatus muscle Infraspinatus muscle Muscle subregions Forward flexion Shear wave elastography Muscle stiffness |
| title | The functional role of the supraspinatus and infraspinatus muscle subregions during forward flexion: a shear wave elastography study |
| title_full | The functional role of the supraspinatus and infraspinatus muscle subregions during forward flexion: a shear wave elastography study |
| title_fullStr | The functional role of the supraspinatus and infraspinatus muscle subregions during forward flexion: a shear wave elastography study |
| title_full_unstemmed | The functional role of the supraspinatus and infraspinatus muscle subregions during forward flexion: a shear wave elastography study |
| title_short | The functional role of the supraspinatus and infraspinatus muscle subregions during forward flexion: a shear wave elastography study |
| title_sort | functional role of the supraspinatus and infraspinatus muscle subregions during forward flexion a shear wave elastography study |
| topic | Supraspinatus muscle Infraspinatus muscle Muscle subregions Forward flexion Shear wave elastography Muscle stiffness |
| url | http://www.sciencedirect.com/science/article/pii/S2666638322001293 |
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