McIntyre D R, Glover L H, Seeds R H, Levene J A
Isotechnologies, Inc., Hillsborough, North Carolina 27278.
J Spinal Disord. 1990 Jun;3(2):147-55.
The purposes of this study were to identify the loading effects on preferred low-back motion and to determine the consistency of preferred low-back motion. Fifteen male and female volunteers served as subjects. Each subject performed four trials of repeated flexion and extension until either the subject became exhausted or for 120s. Each trial corresponded to a relative load of 0, 25, 50, and 75% of the subject's prerecorded maximum torque in isometric flexion. The subjects were instructed to perform the movements at their own pace and through their preferred movement range. The results showed that above the 25% resistance level, the increased loads were accompanied by decreased velocities, with the changes due to the cycle temporal characteristics. The increased loads also resulted in decreased cycle excursions, with these changes due to reductions in the extension endpoints. With increased resistances the descriptive parameters became more variable, with a trend of increased variability toward the latter portion of a trial.
本研究的目的是确定负荷对腰椎偏好运动的影响，并确定腰椎偏好运动的一致性。15名男性和女性志愿者作为受试者。每个受试者进行四次重复屈伸试验，直到受试者筋疲力尽或持续120秒。每次试验对应于受试者等长屈曲预先记录的最大扭矩的0%、25%、50%和75%的相对负荷。受试者被指示以自己的节奏并通过其偏好的运动范围进行运动。结果表明，在25%阻力水平以上，负荷增加伴随着速度降低，这些变化归因于周期时间特征。负荷增加还导致周期偏移减少，这些变化归因于伸展终点的降低。随着阻力增加，描述性参数变得更具变异性，在试验后期有变异性增加的趋势。
