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涓婁紶浜庯細2015-03-04

绮変笣閲忥細34

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快三开奖的结—官方网址22270.COM鈥攎uscle_mechanics

涓嬭浇绉垎锛850

鍐呭鎻愮ず锛 1MUSCLE MECHANICSMuscle model 2Muscle tension and generation of joint torque 3Force on an external objectDepends on intensity of 快三开奖的结—官方网址22270.COM鈥攎uscle activation, but also on 鈥渆xternal leverage鈥.Good leverage: 4Bad leverage:In both examples, the force made by the hand on the shot was 70 N.飥 With good leverage, this required 410 N of 快三开奖的结—官方网址22270.COM鈥攎uscle tension.飥 With bad leverage, the same job required 680 N of 快三开奖的结—官方网址22270.COM鈥攎uscle tension. 5Question: Using a 快三开奖的结—官方网址22270.COM鈥攎uscle tension of 680 N but good leverage, how heavy a shot wouldthe subject be able...

鏂囨。鏍煎紡锛歅DF| 娴忚娆℃暟锛1| 涓婁紶鏃ユ湡锛2015-03-04 12:18:53| 鏂囨。鏄熺骇锛
1MUSCLE MECHANICSMuscle model 2Muscle tension and generation of joint torque 3Force on an external objectDepends on intensity of 快三开奖的结—官方网址22270.COM鈥攎uscle activation, but also on “external leverage”.Good leverage: 4Bad leverage:In both examples, the force made by the hand on the shot was 70 N.飥 With good leverage, this required 410 N of 快三开奖的结—官方网址22270.COM鈥攎uscle tension.飥 With bad leverage, the same job required 680 N of 快三开奖的结—官方网址22270.COM鈥攎uscle tension. 5Question: Using a 快三开奖的结—官方网址22270.COM鈥攎uscle tension of 680 N but good leverage, how heavy a shot wouldthe subject be able to hold?In the last two examples, the 快三开奖的结—官方网址22270.COM鈥攎uscle tension was 680 N.飥 With good leverage, this produced a 124 N force exerted on the shot.飥 With bad leverage, this produced a 70 N force on the shot. 6Some conclusions about external leverage飥 For a given force exerted on an external object, the better the external leverage,the smaller the 快三开奖的结—官方网址22270.COM鈥攎uscle tension needed. 飩 good for preventing injuries飥 For a given 快三开奖的结—官方网址22270.COM鈥攎uscle tension, the better the external leverage, the larger the forceexerted on an external object. 飩 good for achieving high performance 7Some applications of leverage principles 8 9Factors that affect force exerted on an external objectFactors that affect 快三开奖的结—官方网址22270.COM鈥攎uscle tension飥 Amount of effortThe harder you try, the more tension the 快三开奖的结—官方网址22270.COM鈥攎uscle can exert. 10飥 Speed of 快三开奖的结—官方网址22270.COM鈥攎uscle shortening or lengtheningA 快三开奖的结—官方网址22270.COM鈥攎uscle is able to exert a larger tension when it is not allowed to shorten at a fast rate. 11 12 13飥 Mechanical effect of stretching飩 Muscle tension is increased.飩 Reason: When a 快三开奖的结—官方网址22270.COM鈥攎uscle is stretched, the parallel elastic component makes a large force.飩 The effect is immediate.飥 Muscle potentiation飩 Muscle tension is increased.飩 Reason: stretch reflex.飩 The effect comes after a short lag. 14There is another type of 快三开奖的结—官方网址22270.COM鈥攎uscle potentiation. It does not use the nervous system.飥 Pre-tensionLimit in rate of 快三开奖的结—官方网址22270.COM鈥攎uscle tension development creates a problem: Sub-maximal tension in early part of motion.Solution: Pre-tensing of 快三开奖的结—官方网址22270.COM鈥攎uscle. 152 mechanisms for pre-tensing:飩 Pre-tensing through mechanical restraint of motion飩 Pre-tensing through “countermovement”

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