Association of Muscle Strength With Muscle Thickness and Motor Unit Firing Pattern of Vastus Lateralis Muscle in Youth Athletes

Yoshimura, Akane; Kunugi, Shun; Hirono, Tetsuya; Nojima, Hiroya; Ueda, Saeko; Holobar, Aleš; Mita, Yukiko; Watanabe, Kohei

doi:10.1123/ijspp.2022-0094

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…We analyzed the correlation between RAT and Young’s modulus at three time points and found that these two parameters exhibited a weak positive correlation, which is consistent with the results of the study by Peter et al Therefore, we believe that the RAT and stiffness of the rectus abdominis muscle may reflect physiological characteristics such as rectus abdominis muscle strength. Thicker muscles have relatively higher stiffness and muscle strength ( Misirlioglu et al, 2021 ; Yoshimura et al, 2022 ), which beneficial for counteracting the traction of the growing abdominal cavity on both rectus abdominis muscles during pregnancy and facilitates the recovery of the muscle and shrinkage of the IRD during postpartum.…”

Section: Discussionmentioning

confidence: 99%

A prospective study of two-dimensional ultrasonography combined with shear wave elastography for pregnancy-related diastasis recti abdominis

Wang,

Yun,

Zhang

et al. 2024

Front. Physiol.

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ObjectivesTo compare the inter-rectus distance (IRD), rectus abdominis thickness (RAT), and stiffness in women during pregnancy and postpartum and identify the risk and protective factors affecting diastasis recti abdominis (DRA).Materials and methodsA total of 171 pregnant women who volunteered to participate in this study were recruited. Using an ultrasonographic diagnostic instrument with shear wave elastography function, IRD, RAT and the Young’s modulus of the rectus abdominis muscles were measured at 12 weeks, 37 weeks of pregnancy, and 6 weeks postpartum.ResultsThe IRD at 37 weeks was significantly higher than that at 12 weeks and then decreased at 6 weeks postpartum, but it was still higher than that at 12 weeks (p < 0.001). RAT and Young’s modulus decreased significantly at 37 weeks compared with those at 12 weeks and then recovered at 6 weeks postpartum, but they were lower than those at 12 weeks (p < 0.001). IRD at 12 weeks was significantly higher in multiparae than in primiparae (p < 0.001). Moreover, positive correlation between the RAT and Young’s modulus of rectus abdominis muscles at 12 and 37 weeks of gestation and 6 weeks postpartum (p < 0.001) was observed. Multiple linear regression analysis showed that the regression equation was significant (f = 24.856, p < 001).ConclusionOur study identified differences in IRD, thickness and stiffness of the rectus abdominis muscle between early and advanced pregnancy and the postpartum period. The risk and protective factors of DRA may guide pregnant women’s protection and treatment.

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Section: Discussionmentioning

confidence: 99%

A prospective study of two-dimensional ultrasonography combined with shear wave elastography for pregnancy-related diastasis recti abdominis

Wang,

Yun,

Zhang

et al. 2024

Front. Physiol.

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“…Using a different approach, Yoshimura et al (2022) conducted an electromyographic and ultrasound based setup to clarify the link among muscle strength and neural and morphological factors in youth athletes. The results showed a significant correlation between muscle strength and muscle thickness, but not motor unit firing rate.…”

Section: Introductionmentioning

confidence: 99%

Tensiomyography: from muscle assessment to talent identification tool

et al. 2023

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Introduction: Tensiomyography (TMG) is a non-invasive and cost-effective tool that is gaining popularity in fields such as sports science, physical therapy, and medicine. In this narrative review, we examine the different applications of TMG and its strengths and limitations, including its use as a tool for sport talent identification and development.Methods: In the course of crafting this narrative review, an exhaustive literature search was carried out. Our exploration spanned several renowned scientific databases, such as PubMed, Scopus, Web of Science, and ResearchGate. The materials we sourced for our review included a broad spectrum of both experimental and non-experimental articles, all focusing on TMG. The experimental articles featured varied research designs including randomized controlled trials, quasi-experiments, as well as pre-post studies. As for the non-experimental articles, they encompassed a mix of case-control, cross-sectional, and cohort studies. Importantly, all articles included in our review were written in English and had been published in peer-reviewed journals. The assortment of studies considered provided a holistic view of the existing body of knowledge on TMG, and formed the basis of our comprehensive narrative review.Results: A total of 34 studies were included in the review, organized into three sections: 1) assessing muscle contractile properties of young athletes, 2) using TMG in the talent identification and development process and 3) Future research and perspectives. According to data presented here, the most consistent TMG parameters for determining muscle contractile properties are radial muscle belly displacement, contraction time, and delay time. Biopsy findings from the vastus lateralis (VL) confirmed TMG as a valid tool for estimating the ratio of myosin heavy chain (%MHC-I).Conclusion: TMGs ability to estimate the ratio of %MHC-I has the potential to aid in the selection of athletes with the muscle characteristics best suited for a particular sport, eliminating the need for more invasive procedures. However, more research is warranted to fully understand TMG’s potential and its reliability when used with young athletes. Importantly, the use of TMG technology in this process can positively impact health status, reducing the frequency and severity of injuries and the duration of recovery, and subsequently can reduce drop out rates among youth athletes. Future studies should look at twin youth athletes, as a model capable of discriminating between the influence of hereditary factors vs. environmental factors, in therms of muscle contractility and TMG’s potential for instance.

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