EuroMov Digital Health in Motion, Univ Montpellier, IMT Mines Ales, Montpellier, France.
Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK.
Scand J Med Sci Sports. 2024 Jan;34(1):e14517. doi: 10.1111/sms.14517. Epub 2023 Oct 9.
Eccentric, compared to concentric exercise, is proposed to involve different neuro-motor processing strategies and a higher level of mental demand. This study compared eccentric and concentric cycling at matched perceived effort and torque for the mental demand and related-cortical activation patterns. Nineteen men (30 ± 6 years) performed four different 5-min cycling conditions at 30 RPM on a semi-recumbent isokinetic cycle ergometer: (1) concentric at a moderate perceived effort (23 on the CR100® scale) without torque feedback; (2) concentric and (3) eccentric at the same average torque produced in the first condition; and (4) eccentric at the same moderate perceived effort than the first concentric condition. The conditions two to four were randomized. After each condition, mental demand was monitored using the NASA Task Load Index scale. Changes in oxy-(O Hb) and deoxy-(HHb) hemoglobin during exercise were measured over both prefrontal cortices and the right parietal lobe from a 15-probe layout using a continuous-wave NIRS system. Mental demand was significantly higher during eccentric compared to concentric cycling (+52%, p = 0.012) and when the exercise intensity was fixed by the torque rather than the perceived effort (+70%, p < 0.001). For both torque- or perceived effort-matched exercises, O Hb increased significantly (p < 0.001) in the left and right prefrontal cortices, and right parietal lobe, and HHb decreased in the left, and right, prefrontal cortices during eccentric compared to concentric cycling. This study supports that acute eccentric cycling, compared to concentric cycling, involves a higher mental demand, and frontoparietal network activation.
离心运动与向心运动相比，被认为涉及不同的神经运动处理策略和更高的心理需求水平。本研究比较了在匹配感知努力和扭矩的情况下，离心和向心运动的心理需求和相关皮质激活模式。19 名男性（30±6 岁）在半斜倚等速循环测力计上以 30 RPM 进行了四项不同的 5 分钟循环运动：（1）在没有扭矩反馈的情况下以中等感知努力（CR100®量表上的 23）进行向心运动；（2）向心和（3）在第一种条件下产生相同平均扭矩的离心运动；（4）在与第一种向心条件相同的中等感知努力下进行离心运动。条件 2 到 4 是随机的。在每种条件后，使用 NASA 任务负荷指数量表监测心理需求。使用连续波 NIRS 系统，从 15 个探头布局测量前额皮质和右侧顶叶在运动过程中氧合（O Hb）和脱氧（HHb）血红蛋白的变化。与向心运动相比，离心运动时心理需求显著增加（+52%，p=0.012），当运动强度由扭矩而不是感知努力决定时，心理需求增加更多（+70%，p<0.001）。对于扭矩或感知努力匹配的运动，与向心运动相比，左、右前额皮质和右顶叶的 O Hb 显著增加（p<0.001），左、右前额皮质的 HHb 减少。这项研究支持急性离心运动比向心运动需要更高的心理需求和额顶叶网络激活。
