Champagne Annick, Descarreaux Martin, Lafond Danik
Département des Sciences de l'Activité Physique, Université du Québec à Trois-Rivières, Trois-Rivières, Québec, Canada.
J Manipulative Physiol Ther. 2009 Sep;32(7):521-6. doi: 10.1016/j.jmpt.2009.08.008.
Endurance of the back extensor muscles has become important for clinical decisions that guide interventions, particularly for chronic low back pain patients. Very little information is available regarding back muscle endurance in the elderly. The aim of this study was to investigate back extensor muscle endurance in healthy elderly subjects during a modified Sorensen test.
Sixteen elderly and 20 young male adults participated in our cross-sectional study. The subjects performed a modified Sorensen test (on a 45 degrees Roman chair) to quantify lumbopelvic extensor muscle endurance. Pre and postfatigue back extension maximal voluntary force was assessed according to an isometric lift test in a semicrouched position. Endurance time, perceived exertion (Borg CR10 scale), and postfatigue reduction of lifting force were recorded and compared among groups.
Elderly subjects showed a trend toward decreased endurance time compared to young adults, but the difference was not significant. Similar perceived exertion and diminished maximal force after the fatiguing protocol were observed in both young and elderly subjects. Maximal isometric lift force was significantly associated with endurance time in young but not in elderly subjects.
Lumbopelvic extensor muscle endurance and perceived exertion do not differ between young and healthy elderly individuals. However, back muscle endurance seems to be modulated by different neurophysiologic factors in the elderly. Normative data on young adults should be interpreted with caution in assessing back fitness in elderly subjects.
背部伸肌耐力对于指导干预措施的临床决策已变得至关重要，尤其是对于慢性下腰痛患者。关于老年人背部肌肉耐力的信息非常少。本研究的目的是在改良索伦森试验期间，调查健康老年人的背部伸肌耐力。
16名老年人和20名年轻男性成年人参与了我们的横断面研究。受试者进行改良索伦森试验（在45度罗马椅上）以量化腰骨盆伸肌耐力。根据半蹲姿势的等长提升试验评估疲劳前后的背部伸展最大自主力量。记录并比较各组的耐力时间、主观用力程度（博格CR10量表）和疲劳后提升力的降低情况。
与年轻人相比，老年人的耐力时间有下降趋势，但差异不显著。在年轻人和老年人中均观察到类似的主观用力程度以及疲劳方案后最大力量的减弱。最大等长提升力在年轻人中与耐力时间显著相关，而在老年人中则不然。
年轻和健康老年人的腰骨盆伸肌耐力及主观用力程度没有差异。然而，老年人的背部肌肉耐力似乎受不同神经生理因素的调节。在评估老年人的背部健康状况时，应谨慎解读关于年轻人的规范性数据。
