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Module 5 Skeletal Muscle Fiber Types
Skeletal Muscle Fiber Types
Tyler Pacheco
November 23, 2018
What is a Muscle Fiber?
Introduction
- Long muscle cells that have many nuclei positioned on the periphery of the cell (Haff & Triplett, 2016)
Types
S
W
Types
O
T
Type I
- Slow-Twitched (Haff & Triplett, 2016)
- Efficient and fatigue resistant (Haff & Triplett, 2016)
- High capacity for aerobic energy supply (Haff & Triplett, 2016)
- Low myosin ATPase and anaerbic power (Haff & Triplett, 2016)
- Limited rapid force development potential (Haff & Triplett, 2016)
Type IIA
- Fast-twitch (Haff & Triplett, 2016)
- Inefficient and fatigable (Haff & Triplett, 2016)
- Low aerobic power (Haff & Triplett, 2016)
- Rapid force development potential (Haff & Triplett, 2016)
- High anaerobic power and myosin ATPase activity (Haff & Triplett, 2016)
- Aerobic-oxidative energy supply (Haff & Triplett, 2016)
- Greater capacity for aerobic metabolism than type IIx fibers (Haff & Triplett, 2016)
Type IIx
- Similar characteristics as type IIa fibers (Haff & Triplett, 2016)
- Less resistance to fatigue than type IIa fibers (Haff & Triplett, 2016)
Type IIx
Characteristics of Muscle Fiber Types
*Haff & Triplett, 2016
Relative Involvement of Muscle Fiber Types in Sports Events
*Haff & Triplett, 2016
Type I and Type II muscle fibers
*Note Type I muscle are weak or low power whereas Type II are high or strong power (Haff & Triplett, 2016)
*Narayan, 2013
- While in the weight room the Head Coach of the football team approaches you to create a specific strength program for their Running Backs. Would you target one specific muscle fiber type or go with a more balanced approach and Why? What are some exercises you would incorporate to target your desired muscle fibers?
Questions
Your friend wants to train for an upcoming Triathlon. What muscle fiber is the most utilized during Triathlons? How can you specifically target the muscle fibers to help them train for their event?
Question #2
An athlete approaches you one day after reading an article on Facebook highlighting a specific training routine to help change Type I muscle fibers into Type II muscle fibers. Is this article true? If not, how could you help improve the athlete Type II activation?
Question #3
Reference
Haff, G. G., and Triplett, N. T. (2016). Essentials of strength
training and conditioning. Champaign, IL: Human Kinetics
Khan Academy Medicine. (2013). Type I and type 2 muscle
fibers| muscular-skeletal system physiology| NCLEX-RN| khan academy. Available from https://www.youtube.com/watch?v=l5yMz2lFgx0
References