Sparto P J, Parnianpour M, Marras W S, Granata K P, Reinsel T E, Simon S
Biomedical Engineering Center, Ohio State University, Columbus 43210, USA.
J Spinal Disord. 1997 Apr;10(2):145-56.
A novel testing protocol was used to investigate changes in neuromuscular performance, muscle recruitment, and spinal loading as subjects became fatigued while performing an isometric endurance test of varying torque requirements. There was decreased accuracy in maintenance of a reference torque but no change in response time as subjects became fatigued. The study of trunk-muscle recruitment indicated significant increases in internal oblique and latissimus dorsi muscle activity. This change in recruitment led to changes in spinal loading despite a relatively constant torque output. The use of an electromyogram (EMG)-assisted model demonstrated that when subjects are expected to become fatigued during test performance, the assumption of a constant maximal stress capacity of the muscle may not be robust.
采用一种新的测试方案，研究在进行不同扭矩要求的等长耐力测试时，随着受试者疲劳，神经肌肉性能、肌肉募集和脊柱负荷的变化。随着受试者疲劳，维持参考扭矩的准确性降低，但反应时间没有变化。对躯干肌肉募集的研究表明，腹内斜肌和背阔肌的肌肉活动显著增加。尽管扭矩输出相对恒定，但这种募集变化导致了脊柱负荷的改变。使用肌电图（EMG）辅助模型表明，当预计受试者在测试过程中会疲劳时，假设肌肉的最大应力能力恒定可能并不可靠。
