Nicolaisen T, Jørgensen K
Scand J Rehabil Med. 1985;17(3):121-7.
The strength and endurance of the trunk muscles was studied in relation to the extent of earlier low-back trouble (LBT) in a homogeneous, and occupationally active group. Twenty-four female and 53 male postmen with an occupational seniority of more than 2 years took part in the investigation. The cumulative lifetime prevalence, the one-year and the point prevalence of LBT were 67%, 62%, and 4% in females and 55%, 52%, and 0% in males. The rates are higher than in a representative Danish population 40 years old. Anthropometrical measurements and isometric strength (MVC) in trunk flexors and extensors were recorded. The flexibility of the spine, hip and knee joints, the fingertip-floor distance, and the restricted extension of the knee were evaluated. The isometric endurance in the trunk extensors was measured by two methods: 1) prone with the unsupported trunk in a horizontal position and the legs and hips fixated to a couch; and 2) standing, at 60% MVC. The participants were divided into three groups according to the extent of previous LBT, Group I: LBT to a degree that made work impossible, Group II: LBT experienced but not to such a degree that work was hindered, and Group III: LBT never experienced. The main findings were that the isometric endurance time of the trunk extensors was shorter in group I than in II and III, while the trunk muscle strength, anthropometrical measures and joint flexibility were independent of the persons' earlier low-back episodes. Differences in the distribution of ST and FT muscle fibres are suggested as an explanation of the endurance difference.(ABSTRACT TRUNCATED AT 250 WORDS)
在一个职业活跃的同质群体中，研究了躯干肌肉的力量和耐力与早期下背痛（LBT）程度之间的关系。24名职业工龄超过2年的女性和53名男性邮递员参与了调查。女性LBT的累积终生患病率、一年患病率和点患病率分别为67%、62%和4%，男性分别为55%、52%和0%。这些比率高于丹麦40岁的代表性人群。记录了人体测量数据以及躯干屈伸肌的等长力量（MVC）。评估了脊柱、髋关节和膝关节的灵活性、指尖到地面的距离以及膝关节伸展受限情况。通过两种方法测量躯干伸肌的等长耐力：1）俯卧，躯干在水平位置无支撑，腿部和臀部固定在沙发上；2）站立，60%MVC。根据既往LBT的程度将参与者分为三组，第一组：LBT严重到无法工作；第二组：经历过LBT，但未严重到妨碍工作；第三组：从未经历过LBT。主要发现是，第一组躯干伸肌的等长耐力时间比第二组和第三组短，而躯干肌肉力量、人体测量指标和关节灵活性与个体早期的下背病史无关。ST和FT肌纤维分布的差异被认为是耐力差异的一个解释。（摘要截短至250字）
