Fluctuations in plantar flexion force are reduced after prolonged tendon vibration.
Fluctuations in plantar flexion force are reduced after prolonged tendon vibration.
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长时间肌腱振动后，跖屈力的波动会减少。
DOI：
10.1152/japplphysiol.00560.2004
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发表时间：
2004
影响因子：
3.3
通讯作者：
T. Fukunaga
中科院分区：
文献类型：
--
作者：
Y. Yoshitake;M. Shinohara;M. Kouzaki;T. Fukunaga
该研究的目的是检查在低力水平下执行力匹配任务期间长时间振动对力波动的影响。 14 名年轻健康男性在跟腱振动（n = 8，振动受试者）或不振动躺卧（n = 6，对照受试者）之前和之后执行次最大力匹配任务等长跖屈，持续 30 分钟。目标力是预振动最大自主收缩力的2.5-10%。振动后，目标力的力标准偏差平均下降了 29 +/- 20%，而对照组受试者的力标准偏差并未显着下降 (-5 +/- 12%)。与对照受试者相比，这种变化显着更大（两者 P < 0.01）。力的功率谱密度主要由低频带宽（<或=5 Hz）的信号组成，很少有高频分量。在振动受试者中，振动后 < 或 = 2 Hz 频率范围内的功率显着下降。该频率范围内功率的降低与力波动的降低呈线性相关（r = 0.96，P < 0.001）。结果表明，长时间的跟腱振动减少了低水平收缩期间<或=2 Hz频率范围内的跖屈力的波动。它表明 Ia 传入输入有助于跖屈的低频力波动。
The purpose of the study was to examine the effect of prolonged vibration on the force fluctuations during a force-matching task performed at low-force levels. Fourteen young healthy men performed a submaximal force-matching task of isometric plantar flexion before and after Achilles tendon vibration (n = 8, vibration subjects) or lying without vibration (n = 6, control subjects) for 30 min. The target forces were 2.5-10% of the previbration maximal voluntary contraction force. The standard deviation of force decreased by a mean of 29 +/- 20% across target forces after vibration, whereas it did not decrease significantly in control subjects (-5 +/- 12%). This change was significantly greater compared with control subjects (P < 0.01 for both). Power spectral density of the force was predominantly composed of signals of low-frequency bandwidth (<or =5 Hz) with few higher frequency components. In vibration subjects, there was a significant decrease in power in the frequency range < or =2 Hz after vibration. The decrease in power at this frequency range was linearly related to the decrease in the force fluctuations (r = 0.96, P < 0.001). The results indicate that prolonged Achilles tendon vibration reduces the fluctuations in plantar flexion force in the frequency range < or =2 Hz during low-level contractions. It suggests that Ia afferent inputs contribute to the low-frequency force fluctuations in plantar flexion.
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影响因子：
2.5
作者：
GALGANSKI, ME;FUGLEVAND, AJ;ENOKA, RM
通讯作者：
ENOKA, RM
影响因子：
2.5
作者：
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通讯作者：
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2.5
作者：
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通讯作者：
Tracy, BL
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2.5
作者：
Taylor, AM;Christou, EA;Enoka, RM
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Enoka, RM