持久性和感知反应在手握持有失败在两个疲劳值
Minyoung Kwak1, Pasquale J Succi2, Brian Benitez2
1Department of Kinesiology and Health Promotion, The University of Kentucky, Lexington, KY, 40536, USA. mkw223@uky.edu.
European journal of applied physiology
|June 18, 2023
概括
在感知劳动力 (PWCRPE) 的评级上,临界力 (CF) 和体力工作能力在长时间的同位手握任务中是相似的. 这些措施可能会高估可持续的手握力,而不会造成疲劳.
科学领域:
- 运动生理学 运动生理学
- 职业健康 职业健康 职业健康
- 生物力学 生物力学
背景情况:
- 在工业环境中,从持续的手握任务中引起的肌肉骨疾病很常见.
- 了解手握表现的生理限制对于评估工作能力至关重要.
- 疲劳和感知到的劳累是任务可持续性的关键因素.
研究的目的:
- 为了比较相对的力量水平,可持续性和感知反应在临界力 (CF) 和身体工作能力在感知炼的评级 (PWCRPE) 在长时间的同位体握手练习.
- 调查在特定的手握任务中的表现背后的生理机制.
- 描述与疲劳值相关的个人工作能力.
主要方法:
- 十名女性在30%,40%,50%和60%的最大自愿性同位数收缩 (MVIC) 时进行了亚最大,同位数手握保持到失败 (HTF).
- 从这些初始保持值确定了临界力 (CF) 和PWCRPE.
- 随后的HTF试验在确定CF和PWCRPE水平上进行,记录任务失败的时间和感知劳动力 (RPE) 的评级.
主要成果:
- 在CF和PWCRPE之间,没有发现相对强度 (18.9%的CFMVIC与PWCRPE的19.5%的MVIC) 或可持续性 (10.1分钟的CF与PWCRPE的11.6分钟) 的显著差异.
- 在CF和PWCRPE持有期间,感知劳动力 (RPE) 的评级都增加了.
- 结果表明,两个疲劳值之间的性能指标是可比的.
结论:
- 复杂的生理心理因素可能导致疲劳引起的任务失败.
- 在感知劳动力 (PWCRPE) 的评级下,临界力 (CF) 和体力工作能力可能会高估在同位手握握时在没有疲劳的情况下可持续的最大力.
- 需要进一步的研究来完善可持续的握力评估,并预防与工作相关的肌肉骨疾病.
相关概念视频
01:21Fatigue
213
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
213
01:22Fatigue Strength of Concrete
223
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
223
01:24Muscle Recovery and Fatigue
2.2K
Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
2.2K
01:21Plastic Behavior
230
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
230