关于在人类行走中完成的总肌肉工作的估计
Gertjan Ettema1, Jørgen Danielsen1, Vemund Øvstehage1
1Centre for Elite Sports Research, Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, 7491 Trondheim, Norway.
The Journal of experimental biology
|May 20, 2025
概括
步行中的总肌肉功率 (Ptot) 与代谢率 (MR) 呈现出独特的线性关系,类似于骑自行车. 这一发现表明Ptot准确地反映了跨越各种条件行走的能源成本.
科学领域:
- 生物力学 生物力学
- 人体生理学 人体生理学
- 运动科学 运动科学
背景情况:
- 代谢率和机械功率输出之间的关系在许多运动中是线性的,比如骑自行车.
- 这种线性在行走中没有被观察到,这使得其能源消耗难以预测.
- 了解行走的能源成本对于从康复到体育科学等领域至关重要.
研究的目的:
- 要确定步行中的总肌肉功率 (Ptot) 是否与代谢率 (MR) 呈现独特的线性关系.
- 评估这种关系是否独立于不同的行走条件,如速度,斜率和阻力.
- 将步行中的Ptot-MR关系与骑自行车时观察到的关系进行比较.
主要方法:
- 15名成年人在27种不同的条件下 (速度,倾斜,阻力) 在跑步机上行走.
- 使用运动跟踪捕获动力学,并通过气体交换测量代谢率 (MR).
- 总肌肉功率 (Ptot) 被计算为步骤过渡功率 (Psst) 和净外部功率 (Pext) 的总和.
主要成果:
- 外部功率 (Pext) 和MR之间的关系不是唯一的 (R2=0.883),并且受到步行速度的显著影响.
- 总肌肉功率 (Ptot) 和MR之间的关系非常独特和线性 (R2=0.972).
- 步行速度对Ptot-MR关系的影响很小,这表明了一致的能源成本模型.
结论:
- 总肌肉功率 (Ptot) 提供了一种统一而准确的预测步行过程中的新陈代谢率.
- 步行中的Ptot-MR关系与骑自行车的关系非常相似,这表明有一个共同的生理原理.
- 似乎Ptot有效地封装了跨越各种条件行走的主要能量需求.
相关概念视频
01:12Gross Anatomy of Skeletal Muscles
The connective tissues play a significant role in arranging the muscle fibers into a hierarchical structure that forms a complete muscle. Consider a muscle like the bicep brachii, commonly called the bicep. This muscle comprises thousands of muscle fibers enclosed by a protective layer of connective tissue called the endomysium. The endomysium is primarily composed of reticular fibers, a type of thin collagen fiber. It allows the exchange of nutrients and waste products at the fiber level,...
01:27Exercise 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...
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...