White Olivier, Dehouck Victor, Boulanger Nicolas, Dierick Frédéric, Babič Jan, Goswami Nandu, Buisseret Fabien
INSERM UMR1093-CAPS, Université de Bourgogne, UFR des Sciences du Sport, 21000 Dijon, France.
Service de Physique de l'Univers, Champs et Gravitation, UMONS Research Institute for Complex Systems, Université de Mons, 20 Place du Parc, 7000 Mons, Belgium.
iScience. 2024 Mar 28;27(5):109618. doi: 10.1016/j.isci.2024.109618. eCollection 2024 May 17.
The human body exploits its neural mechanisms to optimize actions. Rhythmic movements are optimal when their frequency is close to the natural frequency of the system. In a pendulum, gravity modulates this spontaneous frequency. Participants unconsciously adjust their natural pace when cyclically moving the arm in altered gravity. However, the timescale of this adaptation is unexplored. Participants performed cyclic movements before, during, and after fast transitions between hypergravity levels (1g-3g and 3g-1g) induced by a human centrifuge. Movement periods were modulated with the average value of gravity during transitions. However, while participants increased movement pace on a cycle basis when gravity increased (1g-3g), they did not decrease pace when gravity decreased (3g-1g). We highlight asymmetric effects in the spontaneous adjustment of movement dynamics on short timescales, suggesting the involvement of cognitive factors, beyond standard dynamical models.
人体利用其神经机制来优化动作。当有节奏的动作频率接近系统的自然频率时，这些动作是最优的。在钟摆中，重力会调节这种自发频率。当参与者在改变的重力环境中循环移动手臂时，他们会无意识地调整自己的自然步速。然而，这种适应的时间尺度尚未得到探索。参与者在由人体离心机诱导的超重力水平快速转换（1g - 3g和3g - 1g）之前、期间和之后进行循环动作。动作周期在转换期间根据重力的平均值进行调节。然而，当重力增加（1g - 3g）时，参与者在每个周期基础上加快了动作步速，但当重力降低（3g - 1g）时，他们并没有减慢步速。我们强调了在短时间尺度上运动动力学自发调整中的不对称效应，这表明除了标准动力学模型之外，认知因素也参与其中。
