PED 1323 Motor Control & Motor Learning

At what age do you need to start exercising to be as

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At what age do you need to start exercising to be as fit and functional for as long as possible? Aoyagi Y, Katsuta S. Relationship between the starting age of training and physical fitness in old age. Can J Sport Sci. 1990 Mar;15(1):65-71.
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Motor Control Section 1: Unit 5: Motor Unit Recruitment At what age do you need to start exercising to be as fit and functional for as long as possible? Answer: ??? Electrical stimulation of muscle: For healthy people: electrical stim does not add to strength gains from a strength training program electrical stim which does not produce significant muscle force does not result in strength gains due to low recruitment and lack of force generation (e.g., home muscle stimulation kits) For injured people: electrical stim does add to strength gains from a strength training program electrical stim does maintain muscle mass when a voluntary training program is not possible, if done correctly (i.e., sufficient recruitment & loading of muscle)
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Motor Control Section 2: Muscles fibers types and their use Unit 6a: Neuromuscular adaptations with resistance training What changes when a person weight trains to make them stronger? 6 months heavy resistance training plus explosive jump training ( Hakkinen et al, (1998) J Appl Physiol, 84:pp 1341) . Isometric strength CSA Men 40 36% 5% Women 40 66% 9% Men 70 36% 6% Women 70 57% Observe the changes seen in the following 4 strength training studies: 1) THE INCREASE IN STRENGTH THAT OCCURS IN THE FIRST FEW WEEKS OF A STRENGTH TRAINING PROGRAM PRECEDES INCREASES IN MUSCLE MASS muscle mass typically takes up to 8 weeks to increase significantly strength increases before this increased EMG is observed during these early weeks, when strength is increasing before muscle mass does (Komi 1986) 2) THE INCREASE IN STRENGTH THAT OCCURS IN A LONG TERM STRENGTH TRAINING PROGRAM EXCEEDS INCREASES IN MUSCLE MASS Study A: 60 days of training Quad CSA 8.5% MVC 21% EMG 42% (Narici et. al., 1989). Study B: 8 weeks of training biceps CSA 6.5 MVC 36% EMG 11% (Moritani & Devires, 1979) In both studies, strength increased more than muscle size did. So muscle hypertrophy alone does not explain all of the strength increase. 3) AN INCREASE IN STRENGTH COMMONLY OCCURS IN THE UNTRAINED LIMB IN A UNILATERAL STRENGTH TRAINING PROGRAM (Munn J, Herbert RD, Gandevia SC. Contralateral effects of unilateral resistance training: a meta-analysis. J Appl Physiol. 2004 May;96(5):1861-6. Adamson M et al., Unilateral arm strength training improves contralateral peak force and rate of force development. Eur J Appl Physiol. 2008 Jul;103(5):553- 9.) Study A: 60 days, examination of untrained contralateral limb Quad CSA NO CHANGE MVC 9%
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Motor Control Section 2: Muscles fibers types and their use Unit 6a: Neuromuscular adaptations with resistance training iEMG 25%(Narici et. al., 1989) Study B: 8 weeks isometric strength training, examination of untrained contralateral limb biceps CSA NO CHANGE MVC 24% EMG 21% (Moritani & Devires, 1979)
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  • Fall '11
  • John Smith
  • The Land, Motor control, Gordon Chalmers

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