Faculty of Bioscience and Applied Chemistry, Hosei University, 3-7-2, Kajino, Koganei, Tokyo, 184-8584, Japan.
Graduate School of Sports and Health Studies, Hosei University, Tokyo, Japan.
Eur J Appl Physiol. 2021 Nov;121(11):3069-3081. doi: 10.1007/s00421-021-04773-7. Epub 2021 Jul 27.
This study was aimed at investigating the effect of eccentric contractions (ECCs) of flexor pollicis brevis muscles (FPBMs) on motor and sensory nerve functions as well as the ipsilateral repeated bout effect (IL-RBE) and contralateral (CL)-RBE of motor and sensory nerve conduction velocities following ECCs.
Thirty-two young healthy men (age: 19.6 ± 0.2 years, height: 173.2 ± 1.2 cm, body mass: 69.7 ± 1.9 kg) performed two bouts of ECCs. During the first ECCs bout (ECCs-1), all participants performed 100 ECCs with 1 hand; for the second bout, 3 groups (2 weeks [W]: n = 11, 4W: n = 10, 8W: n = 11) performed ECCs with both hands 2, 4, or 8 weeks after ECCs-1. The maximal voluntary isometric contraction (MVC), range of motion (ROM), visual analog scale for pain (VAS), motor and sensory nerve conduction velocities were measured before, immediately after, and 1, 2, 3, and 5 days after ECCs.
ECCs-1 decreased the MVC, limited the ROM, developed VAS, and decreased the motor and sensory nerve conduction velocities compared to non-exercise hand (p < 0.05). The repeated bout effect was observed in the ROM for IL-RBE in 2W and 4W, VAS for IL-RBE in 2 W, and ROM and VAS for CL-RBE in 2W (p < 0.05). However, RBEs of MVC and motor and sensory nerve conduction velocities were not observed, and no differences were confirmed depending on the interval.
In the present study, ECCs of the FPBM caused a sensory nerve dysfunction, while IL- or CL-RBE was not observed.
本研究旨在探讨指浅屈肌离心收缩（ECC）对运动和感觉神经功能的影响，以及 ECC 后运动和感觉神经传导速度的同侧重复收缩效应（IL-RBE）和对侧（CL-RBE）。
32 名年轻健康男性（年龄：19.6±0.2 岁，身高：173.2±1.2cm，体重：69.7±1.9kg）进行了两次 ECC 运动。在第一次 ECC 运动（ECCs-1）中，所有参与者用 1 只手进行了 100 次 ECC；对于第二次 ECC 运动，3 组（2 周[W]：n=11，4 周[4W]：n=10，8 周[8W]：n=11）在 ECCs-1 后 2、4 或 8 周用双手进行 ECC。在 ECC 之前、之后立即以及之后 1、2、3 和 5 天测量最大自主等长收缩（MVC）、运动范围（ROM）、疼痛视觉模拟量表（VAS）、运动和感觉神经传导速度。
与非运动手相比，ECCs-1 降低了 MVC，限制了 ROM，引起了 VAS，降低了运动和感觉神经传导速度（p<0.05）。在 2W 和 4W 中观察到 IL-RBE 的 ROM 出现重复收缩效应，在 2W 中观察到 IL-RBE 的 VAS 出现重复收缩效应，在 2W 中观察到 CL-RBE 的 ROM 和 VAS 出现重复收缩效应（p<0.05）。然而，没有观察到 MVC 和运动和感觉神经传导速度的重复收缩效应，并且在间隔上没有发现差异。
在本研究中，指浅屈肌的 ECC 导致了感觉神经功能障碍，而没有观察到 IL 或 CL-RBE。
