van Dieën J H, Oude Vrielink H H, Toussaint H M
Work Study and Ergonomics Department, Institute of Agricultural Engineering (IMAG-DLO), Wageningen, The Netherlands.
Eur J Appl Physiol Occup Physiol. 1993;66(1):70-5. doi: 10.1007/BF00863403.
The aim of the present study was to evaluate the viability of a relationship between the temporal activation pattern of parts of the erector spinae muscle and endurance. Seven subjects performed intermittent isometric contractions [4s at 70% maximal voluntary contraction (MVC), 2 s rest] until exhaustion, during which the electromyographical (EMG) activity of the multifidus, iliocostalis thoracis and longissimus muscle segments was recorded. Endurance was defined as the time until exhaustion. Subjects were divided into a high and a low endurance group. The high endurance group showed significantly more variability of EMG amplitude over succeeding contractions. This group demonstrated significantly more alternations of EMG activity between parts of the muscle also. Variability of the EMG amplitude within the contractions did not differ between the groups, nor did MVC. The results indicated that alternating activity between different parts of the erector spinae muscle may function to postpone exhaustion of this muscle as a whole.
本研究的目的是评估竖脊肌部分的时间激活模式与耐力之间关系的可行性。七名受试者进行间歇性等长收缩[以最大自主收缩（MVC）的70%持续4秒，休息2秒]直至力竭，在此期间记录多裂肌、胸髂肋肌和最长肌节段的肌电图（EMG）活动。耐力定义为力竭前的时间。受试者被分为高耐力组和低耐力组。高耐力组在后续收缩过程中EMG幅度的变异性显著更大。该组在肌肉各部分之间的EMG活动交替也显著更多。两组之间收缩期内EMG幅度的变异性没有差异，MVC也没有差异。结果表明，竖脊肌不同部分之间的交替活动可能起到推迟该肌肉整体力竭的作用。
