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Old 08-20-2011, 01:09 AM   #1
tpiob7976
 
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Default 不同运动对运动单位的募集

运动单位的募集指的是运动过程中不同类型的运动参与活动的次序和程度。运动时,人体骨髂肌运动单位的募集具 有以下几个特征:募集的运动单位数量而言,肌肉收缩产生的张力小,募集的运动单位数量少,红外线光波炉;产生的张力大,募集的运动单位数量多,此乃运动单位募集的大小原则。就不同类型的肌纤维募集顺序而言,低 强度运动,如走路,慢跑时,Ⅰ型肌纤维被优先募集;运动强度增加如快跑时,光波炉价格,Ⅱ a型肌纤维被动员参加活动;最大强度运动,光波炉,如短跑时Ⅱ b型肌纤维成为主要活动肌纤维。以上不同类型肌纤维随运动强度增加而表现出来的募集模式称为肌纤维类型的选 择性募集或顺序性募集;此外就长时间大强度运动而言,运动初期,光波炉正品,以Ⅰ和Ⅱ a型肌纤维的活动为主,随着运动时间的延长以及肌糖原消耗的增加,Ⅱ b型肌纤维也被动员参加活动。以上不同类型肌纤维在不同强度和持续时间的运动过程中被募集的特点告诉我们, 为了增进快肌纤维的代谢能力,光波炉的价格,训练内容必须由大强度的练习组成,才能够保证快运动单位在训练中充分活动;同理,要增强慢肌纤维的代谢能 力,训练必须由强度低,持续时间长的练习组成,才能保证慢运动单位在训练中的优先使用。
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