School of Human Kinetics and Recreation, Memorial University of Newfoundland , St. John's, Newfoundland, Canada.
J Sports Sci Med. 2007 Dec 1;6(4):549-59. eCollection 2007.
Studies employing modified Biering-Sørenson tests have reported that low back endurance is related to the potential for developing low back pain. Understanding the manner in which spinal musculature fatigues in people with and without LBP is necessary to gain insight into the sensitivity of the modified Biering-Sørenson test to differentiate back health. Twenty male volunteers were divided into a LBP group of subjects with current subacute or a history of LBP that limited their activity (n = 10) and a control group (n = 10). The median frequency of the fast Fourier transform was calculated from bilateral surface electromyography (EMG) of the upper lumbar erector spinae (ULES), lower lumbar erector spinae (LLES) and biceps femoris while maintaining a prescribed modified Biering-Sørensen test position and exerting isometric forces equivalent to 100, 120, 140 and 160% of the estimated mass of the head-arms-trunk (HAT) segment. Time to failure was also investigated across the percentages of HAT. Fatigue time decreased with increasing load and differences between groups increased as load increased, however these differences were not significant. Significant differences in the EMG median frequency between groups occurred in the right biceps femoris (p ≤ 0.05) with significant pairwise differences occurring at 140% for the left biceps femoris and at 160% for the right biceps femoris. There were significant pairwise differences at 120% for average EMG of the right biceps femoris and at 140% for the right ULES, and right and left biceps femoris (p ≤ 0.05). The modified Biering-Sørensen test as usually performed at 100% HAT is not sufficient to demonstrate significant differences between controls and subjects with varying degrees of mild back disability based on the Oswestry classification. Key pointsThe results do not wholly support the modified Biering-Sørensen test utilizing resistance of 100% HAT to discern differences in fatigue in subjects with mild low back pain.A greater activation of the biceps femoris by low back pain individuals probably contributed to the lack of significant differences in back fatigue times.The possibility exists that subjects with more sophisticated strategies could yield higher fatigue times despite inferior neuromuscular fatigue and the existence of low back pain.
采用改良 Biering-Sørenson 测试的研究报告称，腰背耐力与患腰痛的潜在风险有关。了解腰背肌肉在有和没有腰痛的人群中疲劳的方式，对于了解改良 Biering-Sørenson 测试区分腰背健康的敏感性是必要的。20 名男性志愿者分为腰痛组（有当前亚急性或过去腰痛史，限制活动，n=10）和对照组（n=10）。从中计算双侧表面肌电图（EMG）的上腰椎竖脊肌（ULES）、下腰椎竖脊肌（LLES）和股二头肌的快速傅里叶变换中位数频率，同时保持规定的改良 Biering-Sørensen 测试姿势，并施加相当于头部-手臂-躯干（HAT）段估计质量 100%、120%、140%和 160%的等长力。还研究了失效时间在 HAT 百分比上的变化。随着负荷的增加，疲劳时间减少，随着负荷的增加，组间差异增加，但这些差异没有统计学意义。组间右侧股二头肌的 EMG 中位数频率存在显著差异（p≤0.05），左侧股二头肌在 140%时存在显著差异，右侧股二头肌在 160%时存在显著差异。右侧股二头肌平均 EMG 在 120%时有显著差异，右侧 ULES 和右侧、左侧股二头肌在 140%时有显著差异（p≤0.05）。通常在 100%HAT 下进行的改良 Biering-Sørensen 测试不足以证明根据 Oswestry 分类，在具有不同程度轻度腰背功能障碍的对照组和受试者之间存在显著差异。关键点研究结果不完全支持改良 Biering-Sørensen 测试，该测试利用 100%HAT 的阻力来辨别轻度腰痛患者的疲劳差异。腰痛患者的股二头肌活动增加可能导致腰背疲劳时间无显著差异。尽管存在腰背疼痛和神经肌肉疲劳较差，但具有更复杂策略的受试者可能会产生更高的疲劳时间。
