Ford W J, Bailey S D, Babich K, Worrell T W
Krannert Graduate School of Physical Therapy, University of Indianapolis, IN 46277.
Med Sci Sports Exerc. 1994 Feb;26(2):230-4. doi: 10.1249/00005768-199402000-00014.
Hip position has been hypothesized to influence gravity effect torque (GET) at the knee during isokinetic testing; however, no data exist to support or refute this hypothesis. Therefore, the purposes of this study were 1) to determine if a significant difference exists between GET in seated and supine positions, 2) to determine the effect of the supine and seated GET on isokinetic peak torque values, and 3) to determine the relationship between hamstring flexibility and GET. Gravity effect torque was recorded in supine and seated positions. Peak torque values in flexion and extension were obtained on a isokinetic dynamometer at 1.047 and 5.235 rads.s-1 (60 and 300 degrees.s-1, respectively). Hamstring flexibility was assessed by the active knee extension test (AKET). The mean seated GET value was 5.64 Nm higher than the mean supine GET value (F(1,82) = 97.85, P = 0.0001). Significant correlations existed between hamstring flexibility and GET values measured in the seated and supine positions (r = 0.45, P = 0.0001, and r = 0.30, P = 0.0058, respectively). Significant differences in peak torque values occurred for three of the four isokinetic conditions when using different GET values (P-value 0.0002-0.0049). Although mean differences in peak torque values were only 2.43-4.23 Nm, these differences may translate to significant errors in the isokinetic measurement of the injured population undergoing rehabilitation. Furthermore, every attempt should be made to improve the validity of isokinetic testing. Therefore, we recommend the supine position for GET determination.
据推测，在等速测试过程中，髋关节位置会影响膝关节的重力效应扭矩（GET）；然而，尚无数据支持或反驳这一假设。因此，本研究的目的是：1）确定坐位和仰卧位的GET之间是否存在显著差异；2）确定仰卧位和坐位GET对等速峰值扭矩值的影响；3）确定腘绳肌柔韧性与GET之间的关系。在仰卧位和坐位记录重力效应扭矩。在等速测力计上，分别以1.047和5.235弧度·秒⁻¹（分别为60和300度·秒⁻¹）获取屈伸时的峰值扭矩值。通过主动膝关节伸展试验（AKET）评估腘绳肌柔韧性。坐位GET的平均数值比仰卧位GET的平均数值高5.64牛米（F(1,82)=97.85，P=0.0001）。在坐位和仰卧位测量的腘绳肌柔韧性与GET值之间存在显著相关性（r分别为0.45，P=0.0001；r为0.30，P=0.0058）。当使用不同的GET值时，四种等速测试条件中的三种出现了峰值扭矩值的显著差异（P值为0.0002 - 0.0049）。虽然峰值扭矩值的平均差异仅为2.43 - 4.23牛米，但这些差异可能会在接受康复治疗的受伤人群的等速测量中转化为显著误差。此外，应尽一切努力提高等速测试的有效性。因此，我们建议采用仰卧位来确定GET。
