相关实验视频
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A Novel Application of Musculoskeletal Ultrasound Imaging
Published on: September 17, 2013
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距离腿筋肌机械性能在休息和收缩时使用自由手3D超声波
Chrysostomos Sahinis1, Eleftherios Kellis1
1Department of Physical Education and Sport Sciences at Serres, Laboratory of Neuromechanics, Aristotle University of Thessaloniki, Serres, Greece.
Scandinavian journal of medicine & science in sports
|April 10, 2024
概括
双腿长头 (BFlh) 肌比其他腿筋肌更硬,承受更高的压力. 这可能解释了为什么BFlh伤害在冲刺时很常见.
科学领域:
- 生物力学 生物力学
- 运动医学 运动医学
- 肌肉骨超声波 肌肉骨超声波
背景情况:
- 肌的特性对于人类的运动,运动表现和伤害预防至关重要.
- 双腿长头 (BFlh) 是一个腿筋肌肉,在短跑中经常受伤.
- 与其他腿筋肌肉相比,BFlh肌的独特机械特性尚不清楚.
研究的目的:
- 为了研究和比较远端腿筋肌的形态和机械特性.
- 为了确定双腿骨长头 (BFlh) 肌是否表现出独特的特征.
- 探索肌特性与腿筋损伤发生率之间的关系.
主要方法:
- 利用自由手的三维超声波来评估15名男性的远端腿筋肌.
- 定量肌形态 (长度,体积,CSA,宽度) 和机械性质 (变形,刚性,应变,应力) 在静止状态和在异面膝盖曲过程中.
- 扫描是在20%,40%,60%和80%的最大自愿收缩时进行的.
主要成果:
- 半 (ST) 肌表现出最大的应变和最低的度,CSA和宽度应变最高.
- 双腿短头 (BFsh) 肌表现出最少的应变和变形.
- 双腿长头 (BFlh) 肌表现出最高的刚性和应力,而BFsh具有最低的应力.
结论:
- 在膝盖曲过程中,远端腿筋肌的机械性能在腿筋肌肉之间有很大差异.
- BFlh的高刚性和应力可能导致肌肉囊吸收更多的能量,这可能导致其在冲刺时的受伤率更高.
- 了解这些差异对于有针对性的运动员伤害预防策略至关重要.
相关概念视频
Relaxation of Skeletal Muscles
The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.
Muscle Stimulation Frequency
The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...

