Muscle Stiffness Quantification With Novel Ultrasound Elastography Imaging For Detecting Muscle Damage After Eccentric Contractions

2011 ◽  
Vol 43 (Suppl 1) ◽  
pp. 378
Author(s):  
Minoru Shinohara ◽  
Akibi A. Archer ◽  
Malika M. Grayson ◽  
Karim G. Sabra
Keyword(s):  
Muscle Damage ◽  
Muscle Stiffness ◽  
Ultrasound Elastography ◽  
Eccentric Contractions

Threshold Number Of Low-intensity Eccentric Contractions Of The Elbow Flexors To Induce Muscle Damage

2017 ◽  
Vol 49 (5S) ◽  
pp. 948
Author(s):  
Trevor C. Chen ◽  
Ming-Ju Lin ◽  
Hsin-Lian Chen ◽  
Kazunori Nosaka
Keyword(s):  
Muscle Damage ◽  
Eccentric Contractions ◽  
Elbow Flexors ◽  
Low Intensity

scholarly journals Ultrasound Elastography: The New Frontier in Direct Measurement of Muscle Stiffness

2014 ◽  
Vol 95 (11) ◽  
pp. 2207-2219 ◽  
Author(s):  
Joline E. Brandenburg ◽  
Sarah F. Eby ◽  
Pengfei Song ◽  
Heng Zhao ◽  
Jeffrey S. Brault ◽  
...  
Keyword(s):  
Direct Measurement ◽  
Muscle Stiffness ◽  
Ultrasound Elastography ◽  
New Frontier

scholarly journals Ultrafast Ultrasound-Derived Muscle Strain Measure Correlates with Carotid Local Pulse Wave Velocity in Habitual Resistance-Trained Individuals

2021 ◽  
Vol 11 (18) ◽  
pp. 8783
Author(s):  
Hsin-Fu Lin ◽  
Yi-Hung Liao ◽  
Pai-Chi Li
Keyword(s):  
Pulse Wave Velocity ◽  
Resistance Exercise ◽  
Strain Rate ◽  
Wave Velocity ◽  
Exercise Intensity ◽  
Pulse Wave ◽  
Muscle Stiffness ◽  
Ultrasound Elastography ◽  
Muscle Strain ◽  
Post Exercise

Purpose: this study investigated the effects of the intensity of machine-based bicep curl resistance exercise on ultrafast ultrasound-derived muscle strain rate and carotid ultrafast pulse wave velocity (ufPWV), and examined the association between muscle strain rate, ufPWV, and established carotid function measures in habitual resistance-trained individuals. Methods: twenty-three young habitual resistance-trained males (age: 24 ± 1 year, body mass index = 24 ± 1 kg/m2) were recruited to participate in two bouts of acute bicep curl exercise. After one-repetition maximum determination (1RM), the participants were randomly assigned to engage in bicep curls at 40 or 80%1RM intensity (10 reps × five sets) by a crossover study design. The muscle strain rate of bicep muscle, carotid ufPWV during systole(ufPWV-sys), and diastole (ufPWV-dia) were obtained pre- and post-exercise. In addition, carotid function measures were calculated by obtained carotid diameter and central blood pressure changes. Results: compared with pre-exercise, the reduction in post-exercise muscle strain rate and its area under the curve of 80%1RM was greater than those of 40%1RM. Both ufPWV-sys and ufPWV-dia increased regardless of exercise intensity. Baseline bicep muscle strain rate correlated not only with ufPWV-sys (r = −0.71, p = 0.001), ufPWV-dia (r = −0.74, p = 0.001), but also carotid compliance (r = 0.49, p = 0.02), distensibility (r = 0.54, p = 0.01) and ß stiffness (r= −0.84, p < 0.0001). The ufPWVs also correlated with ß stiffness (r = 0.64–0.76, p = 0.01). Conclusion: muscle stiffness measured by ultrafast ultrasound elastography increases positively with resistance exercise intensity, and it appears to correlate with carotid ufPWV and established carotid function measures in habitual resistance-trained individuals.

Evaluation of Post-Stroke Spastic Muscle Stiffness Using Shear Wave Ultrasound Elastography

2017 ◽  
Vol 43 (6) ◽  
pp. 1105-1111 ◽  
Author(s):  
Chueh-Hung Wu ◽  
Yu-Chun Ho ◽  
Ming-Yen Hsiao ◽  
Wen-Shiang Chen ◽  
Tyng-Guey Wang
Keyword(s):  
Shear Wave ◽  
Muscle Stiffness ◽  
Ultrasound Elastography ◽  
Post Stroke

Power loss is attenuated following a second bout of high intensity eccentric contractions due to the repeated bout effect’s protection of rate of torque and velocity development

2020 ◽  
Author(s):  
Avery Hinks ◽  
Adam Hess ◽  
Mathew I. B. Debenham ◽  
Jackey Chen ◽  
Nicole Mazara ◽  
...  
Keyword(s):  
Muscle Damage ◽  
Eccentric Exercise ◽  
High Intensity ◽  
Power Loss ◽  
Peak Power ◽  
Eccentric Contractions ◽  
Peak Power Output ◽  
Repeated Bout Effect ◽  
Maximum Voluntary Isometric Contraction ◽  
Repeated Bout

High intensity unaccustomed eccentric contractions result in weakness and power loss due to fatigue and muscle damage. Through the repeated bout effect (RBE), adaptations occur, then damage and weakness are attenuated following a subsequent bout. However, it is unclear whether the RBE protects peak power output. We investigated the influence of the RBE on power production and estimated fatigue- and damage-induced neuromuscular impairments following repeated high-intensity eccentric contractions. Twelve healthy adult males performed 5 sets of 30 maximal eccentric elbow flexions and repeated an identical bout 4 weeks later. Recovery was tracked over 7 days following both bouts. Reduced maximum voluntary isometric contraction torque, and increased serum creatine kinase and self-reported soreness indirectly inferred muscle damage. Peak isotonic power, time-dependent measures—rate of velocity development (RVD) and rate of torque development (RTD)—and several electrophysiological indices of neuromuscular function were assessed. The RBE protected peak power, with a protective index of 66% 24 hours after the second eccentric exercise bout. The protection of power also related to preserved RVD (R2=0.61, P<0.01) and RTD (R2=0.39, P<0.01). Furthermore, the RBE’s protection against muscle damage permitted the estimation of fatigue-associated neuromuscular performance decrements following eccentric exercise. Novelty Bullets • The repeated bout effect protects peak isotonic power. • Protection of peak power relates to preserved rates of torque and velocity development, but more so rate of velocity development. • The repeated bout effect has little influence on indices of neuromuscular fatigue.

Low-intensity eccentric contractions of the knee extensors and flexors protect against muscle damage

2015 ◽  
Vol 40 (10) ◽  
pp. 1004-1011 ◽  
Author(s):  
Min-Ju Lin ◽  
Trevor Chung-Ching Chen ◽  
Hsin-Lian Chen ◽  
Bo-Han Wu ◽  
Kazunori Nosaka
Keyword(s):  
Creatine Kinase ◽  
Protective Effect ◽  
Muscle Damage ◽  
Muscle Soreness ◽  
Kinase Activity ◽  
Creatine Kinase Activity ◽  
Eccentric Contractions ◽  
Control Group ◽  
Control Groups ◽  
Low Intensity

This study investigated the magnitude and duration of the protective effect of low-intensity eccentric contractions (LowEC) against damage induced by maximal eccentric contractions (MaxEC) of the knee flexors (KF) and extensors (KE). Young men were assigned to 8 experimental groups and 2 control groups (n = 13/group); the experimental groups performed LowEC of KF or KE 2 days (2d), 1 week (1wk), 2 weeks (2wk), or 3 weeks (3wk) before MaxEC, while the control groups performed MaxEC of KF or KE without LowEC. The 2d, 1wk, 2wk, and 3wk groups performed 30 LowEC of KF or 60 LowEC of KE with a load of 10% of maximal voluntary isometric contraction strength on a resistance-training machine, and all groups performed 30 MaxEC of KF or 60 MaxEC of KE on an isokinetic dynamometer. Several muscle damage markers were measured from before to 2 days after exercise (LowEC) or from before to 5 days after exercise (MaxEC). No significant changes in any variables were evident after LowEC. The changes in all variables after MaxEC were smaller (P < 0.05) for the 2d and 1wk groups (e.g., peak creatine kinase activity: 1002 ± 501 IU/L; peak muscle soreness: 13 ± 5 mm) than for the control group (peak creatine kinase activity: 3005 ± 983 IU/L; peak muscle soreness 28 ± 6 mm) for both KE and KF. There were no significant differences between the 2d and 1wk groups or among the 2wk, 3wk, and control groups. These results show that LowEC provided 30%–66% protection against damage induced by MaxEC of KF and KE, and the protective effect lasted 1 week.

scholarly journals Blood flow restriction prevents muscle damage but not protein synthesis signaling following eccentric contractions

2015 ◽  
Vol 3 (7) ◽  
pp. e12449 ◽  
Author(s):  
Mizuki Sudo ◽  
Soichi Ando ◽  
David C. Poole ◽  
Yutaka Kano
Keyword(s):  
Blood Flow ◽  
Protein Synthesis ◽  
Muscle Damage ◽  
Blood Flow Restriction ◽  
Eccentric Contractions ◽  
Flow Restriction
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