Grant-Beuttler Marybeth, Palisano Robert J, Miller Debra P, Reddien Wagner Barbara, Heriza Carolyn B, Shewokis Patricia A
Department of Physical Therapy, Chapman University, Orange, CA 92866, USA.
Phys Ther. 2009 Feb;89(2):136-48. doi: 10.2522/ptj.20070306. Epub 2009 Jan 8.
Differences in the gastrocnemius-soleus muscle and tendon have been documented shortly after birth in infants born preterm compared with infants born at term. Knowledge of muscle tendon unit lengths at term age to 12 weeks of age in infants born preterm may be useful in understanding motor development.
Gastrocnemius-soleus muscle tendon unit lengths were compared at term age, at 6 weeks of age, and at 12 weeks of age (preterm adjusted age) in 20 infants born full term and 22 infants born preterm.
Significant differences were found between the 2 groups on taut tendon, relaxed muscle length (A(O)); taut tendon, stretched muscle length (A(Max)); and muscle stretch (A(O) to A(Max)). Infants born preterm demonstrated measures of A(O) and A(Max) in positions of greater plantar flexion compared with infants born full term. Significant differences in measurements of A(O) were found between term age and 12 weeks of age, indicating that the tendon lengthens during this period for both groups.
These results provide knowledge of musculoskeletal development of the gastrocnemius-soleus muscle and tendon. Differences in musculoskeletal measurements are consistent with uterine confinement in the last weeks of full-term gestation. These findings have implications when examining the musculoskeletal system in infants born preterm who are demonstrating functional changes.
与足月儿相比，早产儿出生后不久，其腓肠肌 - 比目鱼肌及肌腱就存在差异。了解早产儿足月龄至12周龄时的肌肉肌腱单位长度，可能有助于理解运动发育情况。
比较了20名足月儿和22名早产儿在足月龄、6周龄及12周龄（早产儿矫正年龄）时的腓肠肌 - 比目鱼肌肌腱单位长度。
两组在紧张肌腱、松弛肌肉长度（A(O)）；紧张肌腱、伸展肌肉长度（A(Max)）；以及肌肉伸展度（从A(O)到A(Max)）方面存在显著差异。与足月儿相比，早产儿在更大跖屈位时的A(O)和A(Max)测量值有所不同。在足月龄和12周龄时，A(O)测量值存在显著差异，表明两组在此期间肌腱均会延长。
这些结果提供了腓肠肌 - 比目鱼肌及肌腱肌肉骨骼发育的相关知识。肌肉骨骼测量值的差异与足月妊娠最后几周的子宫内受限情况一致。这些发现对于检查出现功能变化的早产儿的肌肉骨骼系统具有重要意义。
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