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Anna R. Cruz and Kenneth Mautner

In this case series, three elite college-level female volleyball players between 21 and 22 years old experienced acute abdominal pain during an overhead swinging motion. All three athletes were diagnosed with acute rectus abdominis (RA) muscle strain using musculoskeletal ultrasound, without the need for MRI. Each athlete sustained severe RA injury resulting in substantial loss of playing time and warranted a focused rehabilitation program, which emphasized core strengthening, physical modalities, and altering athletes’ hitting technique. RA muscle strain is a relatively infrequent, yet potentially severe, injury in elite volleyball players that necessitates early diagnosis and treatment to avoid prolonged or incomplete recovery.

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Ece Acar, Tamer Çankaya, and Serkan Öner

, physical function, and physical role difficulty scores were applied as subscale of short form-36. Thickness of trunk muscles was determined with anteroposterior (AP) diameter measurement using ultrasound imaging in upper rectus abdominis (URA), central rectus abdominis (CRA), lower rectus abdominis (LRA

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Jinger S. Gottschall, Bryce Hastings, and Zachary Becker

distance between the acromion and the olecranon); latissimus dorsi (4 cm below the inferior angle of the scapula at an oblique angle); rectus abdominis (vertically 2 cm lateral of the umbilicus); and erector spinae (vertically 2 cm lateral of the lumbar spine). We verified that the position of the

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Kunal Bhanot, Navpreet Kaur, Lori Thein Brody, Jennifer Bridges, David C. Berry, and Joshua J. Ode

Abbreviations: CAI, chronic ankle instability; LE, lower-extremity. The Biopac MP 36 System (Biopac Systems Inc, Santa Barbara, CA) was used to collect all the EMG data. 25 , 26 Surface EMG was collected from the erector spinae (ES), external oblique (EOB), and rectus abdominis (RA) bilaterally (ipsilateral

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Ui-Jae Hwang, Sung-Hoon Jung, Hyun-A Kim, Jun-Hee Kim, and Oh-Yun Kwon

include the transverse abdominal (TrA) and internal oblique (IO) muscles, whereas the external oblique and rectus abdominis (RA) muscles mainly contribute to lumbopelvic control (LC). 29 – 32 LC is generally considered to provide a foundation for lumbopelvic dynamic control; this allows for optimal

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James W. Youdas, Hannah E. Baartman, Brian J. Gahlon, Tyler J. Kohnen, Robert J. Sparling, and John H. Hollman

be directed to movement at its distal end. Trunk muscles such as the external oblique, internal oblique, rectus abdominis, and erector spinae provide spinal stabilization, so the prime mover muscles (pectoralis major, anterior deltoid, serratus anterior, and triceps brachii) can generate forceful arm

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Luk Devorski, David M. Bazett-Jones, L. Colby Mangum, and Neal R. Glaviano

foot-elevated side support (FESS), 12 prone bridge plank (PBP), 3 and a 60° V-sit. 2 These exercises have demonstrated increased activation of the rectus abdominis, external oblique, and internal oblique, providing practitioners evidence for their exercise selection. 1 , 13 , 14 While these LPHC

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Billy Chun-Lung So, Calvin Hong-Nin Yuen, Ken Long-Hin Tung, Sheena Lam, Sammy Lan Cheng, Zina Wing-Lam Hung, Rainy Wai-Kwan Leung, and Grace Pui-Yuk Szeto

collected from their right transversus abdominis (TrA), rectus abdominis (RA), lumbar multifidus (LM), and ES muscles, and videos were taken for motion analysis in synchronization to EMG signals. The DWR trials were conducted in a public swimming pool of 2 m deep with a water temperature of 27°C. The

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Leila Ahmadnezhad, Ali Yalfani, and Behnam Gholami Borujeni

disorder in the kinetic chain 14 were excluded from the study (Figure  2 ). Figure 2 —Overhead squats. Procedure This study measured muscle activity in 4 muscles, including the erector spinae (ES), MF, TVA, and rectus abdominis (RA). To attach the electrodes, the participants were in standing and relaxed

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Kyung-eun Lee, Seung-min Baik, Chung-hwi Yi, Oh-yun Kwon, and Heon-seock Cynn

healthy subjects. However, the side bridge exercise with hip abduction is very challenging, and it is important to consider the functional demands and dosage when selecting exercises for muscle training and strengthening. Youdas et al 9 quantified the EMG activity of rectus abdominis (RA), external