MR elastography measurement of the effect of passive warmup prior to eccentric exercise on thigh muscle mechanical properties.
MR elastography measurement of the effect of passive warmup prior to eccentric exercise on thigh muscle mechanical properties.
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DOI：
10.1002/jmri.25642
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发表时间：
2017-10
期刊：
影响因子：
--
通讯作者：
Roberts N
中科院分区：
文献类型：
--
作者：
Kennedy P;Macgregor LJ;Barnhill E;Johnson CL;Perrins M;Hunter A;Brown C;van Beek EJR;Roberts N
目的 使用磁共振弹性成像 (MRE) 在运动引起的肌肉损伤 (EIMD) 之前和之后的 3T 下研究应用热剂 Deep Heat (DH) 进行热身对肌肉机械性能的影响。 20 名男性参与者执行了一项旨在诱导股四头肌 EIMD 的个性化方案。 50% 的参与者在运动前将 DH 涂在大腿上。在方案前后测量 MRE、T 2 加权 MRI、最大自主收缩 (MVC)、肌酸激酶 (CK) 浓度和肌肉酸痛，以评估 EIMD 效果。五名参与者被排除在外：四名参与者没有经历过 EIMD，另一名则因偶然发现而被排除。尽管基线 MVC 没有显着差异 (P = 0.23)，但 EIMD 方案期间执行的总工作量在 DH 组中高于对照组 (P < 0.03)。剪切刚度|G*|两组股直肌 (RF) 肌肉均增加 (P < 0.03)；然而，DH 并不是显着的组间因素（P = 0.15）。 DH 组（5 天）的 MVC 值恢复到基线的速度比对照组（7 天）更快。在 T 2 加权图像上显示高信号的参与者在损伤后的硬度增加比没有的参与者更大： RF； 0.61 kPa vs. 0.15 kPa，P < 0.006，股中间肌； 0.34 kPa 与 0.03 kPa，P = 0.06。通过 MRE 测量，EIMD 会增加肌肉硬度，并伴随 |G*| 的变化当存在T 2 高信号时，该值显着增加。 DH不影响CK浓度或酸痛；然而，DH 参与者在 EIMD 协议期间产生了更大的工作量，并表现出加速的 MVC 恢复。 证据级别：1 技术功效：第 2 阶段 J. Magn.共振。成像 2017 年；46：1115–1127。
To investigate the effect of warmup by application of the thermal agent Deep Heat (DH) on muscle mechanical properties using magnetic resonance elastography (MRE) at 3T before and after exercise‐induced muscle damage (EIMD). Twenty male participants performed an individualized protocol designed to induce EIMD in the quadriceps. DH was applied to the thigh in 50% of the participants before exercise. MRE, T 2‐weighted MRI, maximal voluntary contraction (MVC), creatine kinase (CK) concentration, and muscle soreness were measured before and after the protocol to assess EIMD effects. Five participants were excluded: four having not experienced EIMD and one due to incidental findings. Total workload performed during the EIMD protocol was greater in the DH group than the control group (P < 0.03), despite no significant differences in baseline MVC (P = 0.23). Shear stiffness |G*| increased in the rectus femoris (RF) muscle in both groups (P < 0.03); however, DH was not a significant between‐group factor (P = 0.15). MVC values returned to baseline faster in the DH group (5 days) than the control group (7 days). Participants who displayed hyperintensity on T 2‐weighted images had a greater stiffness increase following damage than those without: RF; 0.61 kPa vs. 0.15 kPa, P < 0.006, vastus intermedius; 0.34 kPa vs. 0.03 kPa, P = 0.06. EIMD produces increased muscle stiffness as measured by MRE, with the change in |G*| significantly increased when T 2 hyperintensity was present. DH did not affect CK concentration or soreness; however, DH participants produced greater workload during the EIMD protocol and exhibited accelerated MVC recovery. Level of Evidence: 1 Technical Efficacy: Stage 2 J. Magn. Reson. Imaging 2017;46:1115–1127.
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影响因子：
3.2
作者：
Barnhill, Eric;Kennedy, Paul;Roberts, Neil
通讯作者：
Roberts, Neil
影响因子：
27.4
作者：
COLLINS, AJ;NOTARIANNI, LJ;SEED, MP
通讯作者：
SEED, MP
DOI：
10.1111/j.1748-1716.1994.tb09806.x
发表时间：
1994-11-01
期刊：
ACTA PHYSIOLOGICA SCANDINAVICA
影响因子：
--
作者：
CRENSHAW, AG;THORNELL, LE;FRIDEN, J
通讯作者：
FRIDEN, J
影响因子：
3.4
作者：
Eston, RG;Finney, S;Baltzopoulos, V
通讯作者：
Baltzopoulos, V
影响因子：
2.9
作者：
Green, M. A.;Geng, G.;Bilston, L. E.
通讯作者：
Bilston, L. E.