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Graham E. Caldwell and Li Li

In this commentary we question whether the relationship between muscle activity and joint moments is the same for natural motor tasks as for controlled experimental situations. An important consideration in this regard is the identification of the correct electromechanical delay (EMD) for comparing EMG and joint moment data. Data from recent cycling studies are used to illustrate the importance of EMD, and how changing task constraints can alter the relation between muscle activity and joint moment balance for bi-articular antagonist pairs.

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Il-young Yu, Dong-kyu Lee, Myoung-Joo Kang and Jae-seop Oh

Blackburn et al 14 found that prone external rotation with horizontal abduction (PER) was the most effective exercise for the infraspinatus muscle, producing 72% of maximal voluntary isometric contraction (MVIC). Ballantyne et al 15 also reported that infraspinatus muscle activity was the highest during

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Chi-Whan Choi, Jung-Wan Koo and Yeon-Gyu Jeong

significantly at play in local lateral support without changing length, suggesting that it contracts practically isometrically. 7 Furthermore, previous research suggested that the muscle activity of QL increased its activation level together with EO and IO as more stability was required during a special

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Komeil Dashti Rostami, Aynollah Naderi and Abbey Thomas

with ACL injury. 18 However, little is known of the effect of ACL injury on hip muscle activity. The muscles of the hip joint, specifically the gluteal muscle group, play a pivotal role in lower-extremity kinematics. 19 For example, the gluteus medius (GMED) stabilizes the pelvis and controls femoral

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Lucinda E. Bouillon, Michael Hofener, Andrew O’Donnel, Amanda Milligan and Craig Obrock

Skechers Shape Up were developed with a rocker-bottom shoe design. There are numerous instability devices for clinicians to use with exercise training; however, it is not clear how these devices affect muscle activity or how they can be used to enhance strengthening or endurance training. The uncertainty

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Shiho Goto, Naoko Aminaka and Phillip A. Gribble

explain inability to maintain hip and knee joints in a neutral position, which could result in increased medial excursion at the hip and knee joint (hip adduction and internal rotation and knee valgus). This relationship is unclear as there is a limited number of studies examining muscle activity and hip

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Neal R. Glaviano, Ashley N. Marshall, L. Colby Mangum, Joseph M. Hart, Jay Hertel, Shawn Russell and Susan Saliba

are a consequence of PFP. Finding therapeutic interventions that specifically target these impairments, such as improving lower-extremity movement patterns and muscle activity during pain provoking tasks like squatting and stair ambulation, may improve overall outcomes in rehabilitation. Females with

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Lauren J. Lattimer, Joel L. Lanovaz, Jonathan P. Farthing, Stéphanie Madill, Soo Kim, Stephen Robinovitch and Cathy Arnold

contributed, muscle activity and strength were not measured. Additionally, the slower speed of descent may not replicate the demands required when velocity increases. Other studies of muscular activity in younger men and women during a simulated fall arrest have focused on the muscles spanning the elbow

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Jinger S. Gottschall, Bryce Hastings and Zachary Becker

upper-body muscles during knee push-ups and toe push-ups. This topic is relevant for individuals who cannot perform a push-up on the toes safely with a full range of motion. The data will indicate if the novice push-up variation on the knees elicits similar muscle activity patterns as the advanced

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Samuele Contemori and Andrea Biscarini

evidence also suggests that impaired ST muscle activity is strongly correlated with common shoulder problems, such as scapular dyskinesis and subacromial impingement. 9 – 13 Specifically, previous research studies highlighted increased UT activity and reduced LT and SA activities in the pathologic