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首页> 外文期刊>The European Journal of Neuroscience >Fibre-type composition of rabbit jaw muscles is related to their daily activity.
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Fibre-type composition of rabbit jaw muscles is related to their daily activity.

机译：兔颌骨肌肉的纤维类型组成与其日常活动有关。

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摘要

Skeletal muscles contain a mixture of fibres with different contractile properties, such as maximum force, contraction velocity and fatigability. Muscles adapt to altered functional demands, for example, by changing their fibre-type composition. This fibre-type composition can be changed by the frequency, duration and presumably the intensity of activation. The aim of this study was to analyse the relationship between the spontaneous daily muscle activation and fibre-type composition in rabbit jaw muscles. Using radio-telemetry combined with electromyography, the daily activity of five jaw muscles was characterized in terms of the total duration of muscle activity (duty time) and the number of activity bursts. Fibre-type composition of the muscles was classified by analysing the myosin heavy chain content of the fibres. The amount of slow-type fibres was positively correlated to the duty time and the number of bursts only for activations exceeding 20-30% of the maximum activity per day. Furthermore, cross-sectional areas of the slow-type fibres were positively correlated to the duty time for activations exceeding 30% of the maximum activity. The present data indicate that the amount of activation above a threshold (> 30% peak activity) is important for determining the fibre-type composition and cross-sectional area of slow-type fibres of a muscle. Activation above this threshold occurred only around 2% of the time in the jaw muscles, suggesting that contractile properties of muscle fibres are maintained by a relatively small number of powerful contractions per day.
机译：骨骼肌包含具有不同收缩特性的纤维混合物，例如最大力，收缩速度和易疲劳性。肌肉可以通过改变其纤维类型的成分来适应不断变化的功能需求。这种纤维类型的成分可以通过频率，持续时间以及激活强度来改变。这项研究的目的是分析兔颌骨肌肉中自发性每日肌肉激活与纤维类型组成之间的关系。使用无线电遥测结合肌电图，根据肌肉活动的总持续时间（工作时间）和活动爆发的次数来表征五只颌骨肌肉的日常活动。通过分析纤维的肌球蛋白重链含量来分类肌肉的纤维类型组成。慢型纤维的数量与工作时间呈正相关，而仅在超过每天最大活动量的20％至30％的激活时，突发数量才会呈正相关。此外，慢型纤维的横截面积与激活时间超过最大活性的30％正相关。目前的数据表明，超过阈值（> 30％的峰值活性）的激活量对于确定肌肉的慢速纤维的纤维类型组成和横截面积很重要。超过此阈值的激活仅在下颚肌肉中发生2％的时间，这表明每天通过相对少量的强力收缩来保持肌肉纤维的收缩特性。

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