Hemborg B, Moritz U
Scand J Rehabil Med. 1985;17(1):5-13.
The aim of this study was to compare trunk muscle strength and intra-abdominal pressure during lifting in low-back patients and in healthy controls. Twenty male workers with 2-18 year history (median 5.5 years) of low-back pain went through strength tests of trunk flexion and extension and a series of standardized lifts. The intra-abdominal pressure (IAP) and the EMG activity of the oblique abdominal muscles and of the erector spinae muscles were recorded. The results were compared with those in 20 healthy men exposed to similar loads at work and at leisure. The low-back patients had reduced abdominal muscle strength (-25%) compared with the healthy controls. The IAP during lifting was the same in the two groups despite the difference in abdominal muscle strength. The trunk extension strength was the same in the two groups. The oblique abdominal muscles were only moderately activated during lifting (5-15% of maximum activity with 25 kg) both in low-back patients and in healthy controls. The erector spinae muscle was strongly activated during lifting (40-60% of maximum activity with 25 kg) both in low-back patients and in healthy controls. During backlifting the duration of erector spinae activity varied. Back patients had extended activity compared with the healthy controls. Stiffness seemed to affect the duration of activity in both groups. The oblique abdominal muscles seem to be of no decisive importance to the IAP.
本研究旨在比较腰痛患者和健康对照者在提举过程中的躯干肌肉力量和腹内压。20名有2至18年（中位数5.5年）腰痛病史的男性工人接受了躯干屈伸力量测试以及一系列标准化提举动作。记录了腹内压（IAP）、腹斜肌和竖脊肌的肌电图活动。将结果与20名在工作和休闲时承受类似负荷的健康男性的结果进行比较。与健康对照者相比，腰痛患者的腹部肌肉力量降低了25%。尽管腹部肌肉力量存在差异，但两组在提举过程中的腹内压相同。两组的躯干伸展力量相同。在提举过程中，腹斜肌在腰痛患者和健康对照者中均仅适度激活（25千克负荷时为最大活动的5%至15%）。在提举过程中，竖脊肌在腰痛患者和健康对照者中均强烈激活（25千克负荷时为最大活动的40%至60%）。在背举过程中，竖脊肌活动的持续时间有所不同。与健康对照者相比，腰痛患者的活动持续时间更长。僵硬似乎影响了两组的活动持续时间。腹斜肌似乎对腹内压没有决定性作用。
