Chronic training status affects muscle excitation of the vastus lateralis during repeated contractions

Jeon, Sunggun; Sontag, Stephanie A.; Herda, Trent J.; Trevino, Michael A.

doi:10.1016/j.smhs.2022.12.005

Cited by 5 publications

(2 citation statements)

References 46 publications

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“…Therefore, the muscle action lasted 19 s. Subjects were digitally presented their torque output in real time on a monitor and were instructed to match the template as closely as possible. If they were not within 5% of the targeted template during the initial trial, they were given a second attempt after a 5-min rest period [ 40 , 41 ].…”

Section: Methodsmentioning

confidence: 99%

Influence of Pennation Angle and Muscle Thickness on Mechanomyographic Amplitude–Torque Relationships and Sex-Related Differences in the Vastus Lateralis

Trevino

Perez

Sontag

et al. 2023

JFMK

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This study examined potential sex-related differences and correlations among the pennation angle (PA), muscle thickness (MT), and mechanomyographic amplitude (MMGRMS)–torque relationships of the vastus lateralis (VL) in 11 healthy males and 12 healthy females. The PA and MT of the VL were quantified with ultrasound. Participants performed an isometric muscle action of the knee extensors that linearly increased to 70% of maximal strength followed by a 12 s plateau. MMG was recorded from the VL. Linear regression models were fit to the log-transformed MMGRMS–torque relationships to calculate b terms (slopes) for the linearly increasing segment. MMGRMS was averaged during the plateau. Males exhibited greater PA (p < 0.001), MT (p = 0.027), b terms (p = 0.005), and MMGRMS (p = 0.016). The b terms were strongly (p < 0.001, r = 0.772) and moderately correlated (p = 0.004, r = 0.571) with PA and MT, respectively, while MMGRMS was moderately correlated with PA (p = 0.018, r = 0.500) and MT (p = 0.014, r = 0.515). The greater mechanical behavior of individuals possessing a larger PA and MT of the VL may reflect increased cross-bridge activity within the muscle fibers. Additionally, PA may help explain sex-related differences in MMGRMS between sexes.

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Section: Methodsmentioning

confidence: 99%

Influence of Pennation Angle and Muscle Thickness on Mechanomyographic Amplitude–Torque Relationships and Sex-Related Differences in the Vastus Lateralis

Trevino

Perez

Sontag

et al. 2023

JFMK

Self Cite

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show abstract

“…This special issue highlights comprehensive reviews and researches on topics in fundamentally important areas of skeletal muscle physiology. 1 , 2 , 3 , 4 , 5 , 6 The most important adaptive response of skeletal muscle to exercise, particularly resistant exercise, is increased protein synthesis, which is critical for promoting muscle hypertrophy and/or preventing atrophy. This process plays an essential role in promoting and maintaining skeletal muscle contractile and metabolic functions.…”

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confidence: 99%