Acute Effect of Static Stretching on Hardness of the Gastrocnemius Muscle

Akagi, Ryota; Takahashi, Hideyuki

doi:10.1249/mss.0b013e3182850e17

Cited by 123 publications

(130 citation statements)

References 35 publications

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“…There are several possible explanations for this discrepancy; anisotropic properties in the human skeletal muscle may be a cause in addition to the differences in modulus and devices used for the measurements. 18,[22][23][24] With the use of the MRE, the shear moduli measured in the direction parallel to the muscle fibre were greater than those measured in the direction perpendicular to the fibre, whereas the values themselves were very different from those reported in earlier studies. 25 In the present study, therefore, we did not express the masseter muscle elasticity in kilopascal using the Young's moduli because the aim of present study was to verify the correlation between the EI ratios and the elasticity of the muscle phantoms.…”

Section: Discussioncontrasting

confidence: 57%

Evaluation of the masseter muscle elasticity with the use of acoustic coupling agents as references in strain sonoelastography

Nakayama

Ariji²,

Nishiyama³

et al. 2015

Dentomaxillofacial Radiology

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Objectives: To verify the use of a single coupling agent as a reference to obtain the elasticity index (EI) ratios and to investigate the EI ratios of the masseter muscles of healthy volunteers. Methods: Muscle phantoms with known elasticity (20, 40 and 60 kPa in the Young's modulus) were examined by strain-type sonoelastography using a coupling agent as the reference. Eight examiners tested soft (with 7 kPa) and hard (with 40 kpa) reference coupling agents separately. The correlation coefficients were determined between the EI ratio and Young's modulus of muscle phantoms. The interclass correlation coefficients were calculated for inter-and intraexaminer agreement. Results: Strong correlations were found between the EI ratios and Young's modulus for both soft and hard references. The variations of the EI ratios were larger with soft coupling agents than those with hard coupling agents, and they increased in phantoms with 60 kPa elasticity. There were no differences in the EI ratios of the masseter muscle at rest between males and females or between the right and left sides. The ratio increased during clenching. Conclusions: The hard reference coupling agent was suitable for obtaining EI ratio of the masseter muscle. No differences were found in the EI ratios of the masseter muscle either between sexes or between the right and left sides at rest, and the ratios increased with the widening of their variations during clenching.

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Section: Discussioncontrasting

confidence: 57%

Evaluation of the masseter muscle elasticity with the use of acoustic coupling agents as references in strain sonoelastography

Nakayama

Ariji²,

Nishiyama³

et al. 2015

Dentomaxillofacial Radiology

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“…The measurement locations were determined based on previous studies [19][20][21][22]. The same locations were used for both SWE and gray scale ultrasound examinations.…”

Section: Swe and Gray Scale Ultrasound Techniquesmentioning

confidence: 99%

Effects of passive muscle stiffness measured by Shear Wave Elastography, muscle thickness, and body mass index on athletic performance in adolescent female basketball players

2018

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Aims: Athletic performance in basketball comprises the contributions of anaerobic and aerobic performance. The aim was to investigate the effects of passive muscle stiffness, using shear wave elastography (SWE), as well as muscle thickness, and body mass index (BMI), on both aerobic and anaerobic performances in adolescent female basketball players.Material and methods: Anaerobic and aerobic (VO2max) performance was assessed using the vertical jump and shuttle run tests, respectively, in 24 volunteer adolescent female basketball players. Passive muscle stiffness of the rectus femoris (RF), gastrocnemius medialis (GM), gastrocnemius lateralis (GL) and soleus muscles were measured by SWE, and the thickness of each muscle was assessed by gray scale ultrasound. The BMI of each participant was also calculated. The relationship between vertical jump and VO2max values, and those of muscle stiffness, thickness, and BMI were investigated via Pearson’s correlation and multivariate linear regression analysis.Results: No significant correlation was observed between muscle stiffness and VO2max or vertical jump (p>0.05). There was significant negative correlation between GL thickness and VO2max (p=0.026), and soleus thickness and VO2max (p=0.046). There was also a significant negative correlation between BMI and VO2max (p=0.001). Conclusions: This preliminary work can be a reference for future research. Although our article indicates that passive muscle stiffness measured by SWE is not directly related to athletic performance, future comprehensive studies should be performed in order to illuminate the complex nature of muscles. The maintenance of lower muscle thickness and optimal BMI may be associated with better aerobic performance.

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“…11 A 10-mm × 10-mm region of interest (ROI) was defined within the MG, and a 5-mm diameter circle-a measurement tool of the ultrasound system used to automatically quantify Young's modulus-was positioned at the center of the ROI. 1 Tissue elasticity of the Achilles tendon was measured at two sites: 10% and 15% of the lower leg length proximal to the calcaneal tuberosity. 19,20 At each site, a 10-mm × 10-mm ROI was defined around the Achilles tendon, and a 2-4-mm diameter circle-used to automatically quantify Young's modulus-was positioned within the ROI.…”

Section: Measurement Of Muscle and Tendon Elasticitymentioning

confidence: 99%

The association of muscle and tendon elasticity with passive joint stiffness: In vivo measurements using ultrasound shear wave elastography

Chino

Takahashi

2015

Clinical Biomechanics

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Acute Effect of Static Stretching on Hardness of the Gastrocnemius Muscle

Abstract: The results of this study suggest that three bouts of 2-min SS of the plantar flexors is useful for preventing muscle injury, improving muscle condition, and maintaining muscle strength, and that the acute effects of SS on the muscle hardness of MG and LG are of the same degree.

Cited by 123 publications

References 35 publications

Evaluation of the masseter muscle elasticity with the use of acoustic coupling agents as references in strain sonoelastography

Evaluation of the masseter muscle elasticity with the use of acoustic coupling agents as references in strain sonoelastography

Effects of passive muscle stiffness measured by Shear Wave Elastography, muscle thickness, and body mass index on athletic performance in adolescent female basketball players

The association of muscle and tendon elasticity with passive joint stiffness: In vivo measurements using ultrasound shear wave elastography

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