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Muscle Fiber Types Explained: Type 1, Type 2a, Type 2x | Muscle Physiology and Training Adaptations

Muscle Fiber Types Explained: Type 1 vs. Type 2a vs. Type 2x Type 1 -Slow Twitch (slow twitch speed/ slow rate of force development) * Small, red * Recruited first in response to action potential * Slow nerve conduction * HIGHLY fatigue resistant (oxidative) good for endurance – high aerobic enzyme content * Low Myosin ATPase (low contraction speed) * Low power * HIGH capillary & mitochondrial density * Cross country, marathon Type IIa * Medium, white/red * Larger motor units * Fast contract/relax speed and nerve conduction velocity, intermediate power * More anaerobic enzyme content * Intermediate capillary and mitochondrial density * Low myoglobin Type IIx * Largest motor units * Largest diameter fiber, white * High recruitment threshold * Fast conduction and contraction * Low fatigue resistance/ endurance * High force and power * Low capillary / mitochondrial density * Large fibers * Sprint, weightlifting Studying for the CSCS Exam? Check out the Strength and Conditioning Study Course: https://www.themovementsystem.com/str... 👇🏽Click here to Join a Facebook Strength and Conditioning Study Group!   / 2415992685342170   Comment below if you have any questions! 0:00 0:06 Intro 0:29 Muscle Structure 1:05 Motor Units and Mosaic Distribution 2:15 Size Principle 3:30 Type I Fibers 5:59 Type IIa Fibers 8:52 Type IIx Fibers 10:46 Muscular Adaptations 12:00 Detraining 13:20 Muscle Fiber Hypertrophy 14:20 Myosin Isoform ✅ Let’s Connect: 📱 Instagram: @themovementsystem