Abstract：
The aim of this study was to investigate the effect of aging and resistance training with a moderate load on the size and mechanical properties of the patellar (PT) and Achilles tendon (AT) and their associated aponeuroses; medial gastrocnemius (MG) and vastus lateralis (VL). Young (Y55; 24.8 ± 3.8 yrs, n = 11) and old men (O55; 70.0 ± 4.6 yrs, n = 13) were assigned to undergo a training program (12 weeks; 3 times/week) of moderate slow resistance training [55% of one repetition maximum (RM)] of the triceps surae and quadriceps muscles. Tendon dimensions were assessed using 1.5 T magnetic resonance imaging before and after 12 weeks. AT and PT cross sectional area (CSA) were determined every 10% of tendon length. Mechanical properties of the free AT, MG aponeurosis, PT, and VL aponeurosis were assessed using ultrasonography (deformation) and tendon force measurements. CSA of the AT but not PT was greater in O55 compared with Y55. At baseline, mechanical properties were generally lower in O55 than Y55 for AT, MG aponeurosis and VL aponeurosis (Young\'s modulus) but not for PT. CSA of the AT and PT increased equally in both groups following training. Further, for a given force, stiffness and Young\'s modulus also increased equally for VL aponeurosis and AT, for boths groups. The present study highlights that except for the PT, older men have lower tendon (AT, MG aponeurosis, and VL aponeurosis) mechanical properties than young men and 12-weeks of moderate slow resistance training appears sufficient to improve tendon size and mechanical adaptations in both young and older men. New and Noteworthy: These novel findings suggest that short-term moderate slow resistance training induces equal improvements in tendon size and mechanics regardless of age.
摘要：
这项研究的目的是研究中等负荷的衰老和阻力训练对the骨（PT）和跟腱（AT）及其相关的腱神经的大小和机械性能的影响；内侧腓肠肌（MG）和股外侧肌（VL）。年轻（Y55；24.8±3.8年，n=11)和老年男性(O55；70.0±4.6岁，n=13）被分配接受训练计划（12周；3次/周），对肱三头肌和股四头肌进行中等程度的缓慢阻力训练[一次重复最大（RM）的55％]。在12周之前和之后，使用1.5T磁共振成像评估肌腱尺寸。每10%的肌腱长度确定AT和PT横截面积(CSA)。自由AT的机械性能，MG腱膜，PT,使用超声检查（变形）和肌腱力测量评估VL肌腱膜。与Y55相比，O55中AT而不是PT的CSA更大。在基线,对于AT，O55的机械性能通常低于Y55，MG膜和VL膜膜（杨氏模量），但不是PT。训练后，两组的AT和PT的CSA均增加。Further,对于给定的力量，VL膜和AT的刚度和杨氏模量也同样增加，对于两个群体。本研究强调，除了PT，老年男性有较低的肌腱(AT，MG腱膜，和VL腱膜）的机械性能比年轻男性高，并且12周的中度缓慢阻力训练似乎足以改善年轻和老年男性的肌腱大小和机械适应性。新的和值得注意的：这些新的发现表明，无论年龄大小，短期适度的缓慢阻力训练都会引起肌腱大小和力学的同等改善。
