相关实验视频

Updated: Jun 27, 2025

An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles

An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles

Published on: August 25, 2020

运动范围对施加力特征和电肌图学活动在重复的长椅压力练习中运动范围的影响

Athanasios Tsoukos¹, Michal Wilk², Michał Krzysztofik²

¹School of Physical Education and Sports Science, National & Kapodistrian University of Athens, Athens, Greece.

Journal of human kinetics

|May 1, 2024

概括

在长椅压力练习中的疲劳主要是由不同运动范围 (ROM) 的速度损失,而不是力量减少所驱动的. 这对功率输出的影响比施加力更为显著,特别是在较长的肌肉长度的情况下.

科学领域:

生物力学生物力学
运动生理学运动生理学
运动科学运动科学运动科学

背景情况:

运动范围 (ROM) 在阻力练习期间显著影响力产生和肌肉激活.
了解像长椅压力这样的动态运动中的疲劳机制对于优化训练和表现至关重要.

研究的目的:

为了研究不同范围的动作 (全,上半,下半) 在重复的长板压力中对力,功率输出和电动图 (sEMG) 活动的影响.
为了确定疲劳的主要贡献者 (力损失与速度损失) 在最大努力的横跨不同ROM的长板压力.

主要方法:

十名抵抗训练的男子进行了三组至失败的长椅压力练习,每隔两分钟的休息时间.
练习是在三个ROM条件下进行的:全 (FULL),上半部分 (TOP) 和下半部分 (BOTTOM).
测量包括相关肌肉的平均和峰值力,输出功率和表面电肌图 (sEMG).

主要成果:

与FULL和BOTTOM相比,在TOP ROM条件下峰值和平均力显著更高.
在重复的设置过程中,观察到峰值和平均输出功率的显著下降,而平均力最小减少.
疲劳的特点是sEMG活动增加和中位数频率下降,三腕sEMG与ROM之间的力和功率差异相关.

结论:

速度损失,而不是力量损失,是疲劳的主要驱动因素,在不同范围的运动中在长椅压力运动期间的功率输出方面.
在BOTTOM ROM状态下,较长的肌肉长度可能会导致性能下降和疲劳.
sEMG反应,特别是在三腕,反映了在测试的ROM中观察到的力量和功率输出差异.

关键词:

疲劳疲劳疲劳疲劳疲劳疲劳强力板的强力板是什么?这是一种冲动的冲动.肌肉力量肌肉力量肌肉力量耐力运动是一种抵抗运动.

更多相关视频

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test

Published on: July 27, 2015

Measurement of Maximum Isometric Force Generated by Permeabilized Skeletal Muscle Fibers

Measurement of Maximum Isometric Force Generated by Permeabilized Skeletal Muscle Fibers

Published on: June 16, 2015

相关概念视频

Motor Unit Stimulation

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...

Muscle Stimulation Frequency

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...

Exercise and Muscle Performance

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...