Saito M, Watanabe H, Mano T
Laboratory of Applied Physiology, Toyota Technological Institute, Nagoya, Japan.
Eur J Appl Physiol Occup Physiol. 1993;66(2):108-15. doi: 10.1007/BF01427050.
To determine whether or not muscle endurance training alters exercise-induced sympathetic nerve response, we recorded muscle sympathetic nerve activity (MSNA) microneurographically during forearm exercise and compared MSNA between dominant (D) and non-dominant (ND) forearms of players of racket sports. Three kinds of forearm exercise were conducted on each side; static (SHG) and dynamic (DHG, at a rate of 1 Hz) handgrip exercise at a loading of 25% of maximal voluntary contraction until exhaustion, and 10-min submaximal dynamic handgrip (at a rate of 1 Hz) at an intensity of 0.9 W. Heart rate, ventilation and blood pressure were also monitored at rest and during SHG and DHG exercises. During the last minute of SHG exercise, MSNA burst rate had increased on average by 290 (SEM 46)% in D and 330 (SEM 46)% in ND, while during DHG it increased by 288 (SEM 38)% in D and 344 (SEM 36)% in ND, respectively. There were no significant differences in the MSNA responses between D and ND forearms in either exercise modes. Significant increases in heart rate, ventilation and blood pressure during the last minute of fatiguing SHG and DHG were observed, but there were no significant differences between the two forearms. During submaximal DHG, while MSNA increased significantly above control values in both D and ND, the MSNA response was less in D than that in ND forearm. The results would suggest that exercise-induced MSNA responsiveness is influenced little by muscle endurance training but the intensity of response may be due to the magnitude of metaboreceptor stimulation in the exercising muscle.
为了确定肌肉耐力训练是否会改变运动诱发的交感神经反应，我们在前臂运动期间通过微神经电图记录肌肉交感神经活动（MSNA），并比较了球拍运动运动员优势（D）和非优势（ND）前臂之间的MSNA。在每一侧进行三种前臂运动：以最大自主收缩的25%负荷进行静态（SHG）和动态（DHG，频率为1 Hz）握力运动直至疲劳，以及以0.9 W强度进行10分钟次最大动态握力（频率为1 Hz）。在休息时以及SHG和DHG运动期间还监测心率、通气和血压。在SHG运动的最后一分钟，D侧的MSNA爆发率平均增加了290（标准误46）%，ND侧增加了330（标准误46）%，而在DHG期间，D侧增加了288（标准误38）%，ND侧增加了344（标准误36）%。在两种运动模式下，D侧和ND侧前臂的MSNA反应均无显著差异。在疲劳性SHG和DHG的最后一分钟观察到心率、通气和血压显著增加，但两侧前臂之间无显著差异。在次最大DHG期间，虽然D侧和ND侧的MSNA均显著高于对照值增加，但D侧的MSNA反应小于ND侧前臂。结果表明，运动诱发的MSNA反应性受肌肉耐力训练的影响很小，但反应强度可能归因于运动肌肉中代谢感受器刺激的程度。
