Relationship between isometric contraction intensity and muscle hardness assessed by ultrasound strain elastography

Inami, Takayuki; Tsujimura, Tohru; Shimizu, Takuya; Watanabe, Takemasa; Lau, Wing Yin; Nosaka, Kazunori

doi:10.1007/s00421-016-3528-2

Cited by 31 publications

(26 citation statements)

References 30 publications

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“…The significant influence of muscular stress on the elasticity of biceps brachii and rectus femoris muscle observed in our study by strain ratio analysis could be explained by increased blood flow due to vasodilation within the muscle [23]. In their studies, Inami et al [13] and Berko et al [8] likewise describe greater elasticity after exercise. In addition, Inami et al observed hardening of the musculature when measuring in the contracted state [13].…”

Section: Results Of Muscle-healthy Adultssupporting

confidence: 59%

“…In their studies, Inami et al [13] and Berko et al [8] likewise describe greater elasticity after exercise. In addition, Inami et al observed hardening of the musculature when measuring in the contracted state [13]. Strain elastography can therefore not only detect differences in muscle architecture, but also indicate an increase in tone or possibly changes in blood flow.…”

Section: Results Of Muscle-healthy Adultsmentioning

confidence: 92%

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Strain Ultrasound Elastography of Muscles in Healthy Children and Healthy Adults

Wenz

Dieckmann

Brandl

et al. 2019

Fortschr Röntgenstr

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Purpose Standardized application and evaluation of the strain ultrasound elastography method (USE) by means of a strain color scale (SCS) and a strain ratio analysis. To determine differences in muscle elasticity in healthy children and adults. Materials and Methods Initially Mm. biceps brachii, Mm. recti femoris and Mm. gastrocnemii of 22 healthy adults were examined before and after exercise. Secondly measurements were obtained at rest in 21 healthy children. Results There was a difference in muscle elasticity between the upper and lower extremity. Muscle elasticity tends to be higher after exercise in healthy adults. SCS and strain ratio analysis show a similar trend. In comparison to adults, healthy children show lower muscle elasticity at rest using both analysis methods. Conclusion Strain elastography is an easy to perform, cost-effective, non-invasive method to determine muscle stiffness, if the conditions of standardized measurements are given. Key Points: Citation Format

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Section: Results Of Muscle-healthy Adultssupporting

confidence: 59%

Section: Results Of Muscle-healthy Adultsmentioning

confidence: 92%

Strain Ultrasound Elastography of Muscles in Healthy Children and Healthy Adults

Wenz

Dieckmann

Brandl

et al. 2019

Fortschr Röntgenstr

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“…In general, active and passive muscle strength is related to muscle hardness [14]. Broos et al [3] reported that individuals with the RR genotype of the ACTN3 R577X polymorphism have higher hysteresis and Young's modulus of single fibers than individuals with RX and XX genotypes among subjects with a spinal cord injury.…”

Section: Introductionmentioning

confidence: 99%

Effects of the ACTN3 R577X Genotype on the Muscular Strength and Range of Motion Before and After Eccentric Contractions of the Elbow Flexors

et al. 2017

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The purpose of present study was to examine the association between ACTN3 R577X genotype and functional characteristics of elbow flexors before and after isokinetic eccentric contractions (ECCs). Fifty-two men (age: 20.8±3.8 years, height: 172.5±5.9 cm, body mass: 64.7±6.5 kg, BMI: 21.7±1.7) who had not participated in any regular resistance training for at least 1 year prior to this study were recruited. ECCs consisted of five sets of six maximal voluntary isokinetic (30°/s) ECCs of the elbow flexors with a range of motion (ROM) from 90° flexion to 0° (full extension). Measurements of maximal voluntary isometric contraction (MVC) torque, ROM, and muscle soreness were taken before, immediately after, and 1, 2, 3, and 5 days after ECCs. Genotyping results were analyzed for identifying ACTN3 R577X polymorphism (rs1815739) using TaqMan approach. The genotype frequencies of the ACTN3 R577X polymorphism were RR 26.9% (n=14), RX 50.0% (n=26), and XX 23.1% (n=12). There were no significant differences in MVC torque, ROM, and soreness between three genotype groups of ACTN3 R577X. However, MVC at baseline was greater in RR homozygotes than in X-allele carriers (combined XX and RX; p<0.05). ROM in RR homozygotes at baseline was lower than that of X-allele carriers. Although a significant decrease in ROM was observed in X-allele carriers until 3 days after ECCs, a significant ROM reduction in RR homozygotes was observed only immediately after ECCs. Our data indicated that ACTN3 RR genotype has higher MVC and lower flexibility than X-allele carriers at baseline, but the effect of ACTN3 R577X genotype on these two parameters is limited after ECCs.

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“…In this study, we utilized two independent measurements, muscle hardness as measured with strain elastography, and maximal isometric torque . The former was utilized to establish the significance of discrete areas and to evaluate the mechanical properties of particular muscle systems . The latter maximal torque production reflects tension created by various muscles and is good measure of overall functionality.…”

Section: Introductionmentioning

confidence: 99%

Unstable rocker shoes promote recovery from marathon‐induced muscle damage in novice runners

Nakagawa

Inami

Yonezu

et al. 2017

Scandinavian Med Sci Sports

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We recently reported that wearing unstable rocker shoes (Masai Barefoot Technology: MBT) may enhance recovery from marathon race-induced fatigue. However, this earlier study only utilized a questionnaire. In this study, we evaluated MBT utilizing objective physiological measures of recovery from marathon-induced muscle damages. Twenty-five university student novice runners were divided into two groups. After running a full marathon, one group wore MBT shoes (MBT group), and the control group (CON) wore ordinary shoes daily for 1 week following the race. We measured maximal isometric joint torque, muscle hardness (real time tissue elastography of the strain ratio) in the lower limb muscles before, immediately after, and 1, 3, and 8 days following the marathon. We calculated the magnitude of recovery by observing the difference in each value between the first measurement and the latter measurements. Results showed that isometric torques in knee flexion recovered at the first day after the race in the MBT group while it did not recover even at the eighth day in the CON group. Muscle hardness in the gastrocnemius and vastus lateralis showed enhanced recovery in the MBT group in comparison with the CON group. Also for muscle hardness in the tibialis anterior and biceps femoris, the timing of recovery was delayed in the CON group. In conclusion, wearing MBT shoes enhanced recovery in lower leg and thigh muscles from muscle damage induced by marathon running.

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Relationship between isometric contraction intensity and muscle hardness assessed by ultrasound strain elastography

Cited by 31 publications

References 30 publications

Strain Ultrasound Elastography of Muscles in Healthy Children and Healthy Adults

Strain Ultrasound Elastography of Muscles in Healthy Children and Healthy Adults

Effects of the ACTN3 R577X Genotype on the Muscular Strength and Range of Motion Before and After Eccentric Contractions of the Elbow Flexors

Unstable rocker shoes promote recovery from marathon‐induced muscle damage in novice runners

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