Evaluation of viscoelastic parameters of the skeletal muscles in junior triathletes
Evaluation of viscoelastic parameters of the skeletal muscles in junior triathletes
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DOI：
10.1088/0967-3334/28/6/002
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发表时间：
2007-06-01
影响因子：
3.2
通讯作者：
Maaroos, Jaak
中科院分区：
文献类型：
--
作者：
Gavronski, Georg;Veraksits, Alar;Maaroos, Jaak
在为期七周的比赛期间，观察了爱沙尼亚国家青年队的五名男子铁人三项运动员。采用Myoton-2型粘弹性参数测定仪测定骨骼肌的粘弹性参数。肌肉组织阻尼机械振荡的频率（Hz -表示肌肉中的张力），振荡的对数衰减在放松和收缩状态下，记录了8块肌肉的双侧肌肉组织的弹性（θ-表示肌肉的弹性）和刚度（Nm（-1））：（长头）; TB -肱三头肌（长头）; BF股二头肌（长头）; RF -股直肌; TA -胫骨前肌; GC -腓肠肌（内侧头）; LD -背阔肌; PM -胸大肌（胸肋部）。在测量过程中，使用便携式按摩台供受试者休息。对于前部肌肉的测量，受试者仰卧;对于后部肌肉，使用俯卧位。简单地通过肢体的相同测量位置来标准化（等长）收缩-受试者将他的手臂或腿从水平面抬起到45度角，使用2.3 kg哑铃作为上肢的额外重量。踝背屈和跖屈是在固定的桌子上进行的，以收缩小腿肌肉。骨骼肌的弹性在收缩状态下比在松弛状态下更高（p < 0.0001），并且通过对数衰减值的下降来描述，肌肉中的刚度和张力增加（对于两个参数，p < 0.0001）。测量的骨骼肌在松弛状态下的粘弹性质显著不同（p < 0.0018）。在放松状态下，TA是最有弹性的（平均值+/- SD; Theta - 0.74 +/- 0.13），僵硬的（平均值+/- SD; 346.68 +/- 60.34 Nm（-1））和紧张的肌肉（平均值SD; 18.72 +/- 1.55 Hz）。在收缩状态下，TA的弹性没有变化（0.76 +/- 0.14），而该肌肉的刚度和张力显著上升（分别为93%和38%）。如果将来自肌肉的汇总数据在受试者之间进行比较，则存在个人差异（p < 0.005）。
Five male triathletes of the Estonian national junior team were observed during a seven-week competition period. The Myoton-2 equipment was used to describe the viscoelastic parameters of the skeletal muscles. The frequency of damped mechanical oscillation of the muscle tissue (Hz - indicating the tension in the muscle), logarithmic decrement of the oscillations (Theta - indicating the elasticity of the muscle) and stiffness (N m(-1)) of the muscle tissue were registered bilaterally in eight muscles in both the relaxed and the contracted states: BB biceps brachii (caput longum); TB - triceps brachii (caput longum); BF biceps femoris (caput longum); RF - rectus femoris; TA - tibialis anterior; GC - gastrocnemius (caput mediale); LD - latissimus dorsi; PM - pectoralis major (pars sternocostalis). A portable massage table was used for the subject to rest on during the measuring. For the measurement of the anterior muscles, the subject lay supine; for the posterior muscles the prone position was used. The (isometric) contraction was standardized simply by the same measuring position of the limb - the subject raised his arm or leg to an angle of 45 degrees from the horizontal level, using a 2.3 kg dumb-bell as an additional weight for the upper limb. The tarsal dorsiflexion and plantarflexion was performed against a fixed table to contract the crural muscles. The elasticity of the skeletal muscle is higher for the contracted state with respect to the relaxed one (p < 0.0001) and is described by decline of the value of logarithmic decrement, the stiffness and the tension in the muscle increases (p < 0.0001 for both parameters). The measured skeletal muscles differ significantly (p < 0.0018) by the viscoelastic properties in the relaxed state. In the relaxed state, TA was the most elastic (mean +/- SD; Theta - 0.74 +/- 0.13), stiff (mean +/- SD; 346.68 +/- 60.34 N m(-1)) and tense muscle (mean SD; 18.72 +/- 1.55 Hz). In the contracted state, the elasticity of TA did not change (0.76 +/- 0.14) while the stiffness and the tension in this muscle rose significantly (93% and 38%, accordingly). Personal differences (p < 0.005) exist if pooled data from the muscles are compared between the subjects.