Question

1. which contraction happens when you hold a yoga pose?
2. when you run downhill, which contraction type controls your legs?
3. which contraction builds strength without visible movement?
4. why is it important for athletes to train all three types of contractions?

part 3: muscle fibers
muscles have three main types of fibers:

• slow - twitch (type i): endurance, uses oxygen, long - lasting.
• fast - twitch oxidative (type iia): moderate power, lasts 60–90 sec.
• fast - twitch glycolytic (type iib): short bursts, very powerful, fatigues quickly.

1. which muscle fiber is used for a marathon?
2. which muscle fiber is used for sprinting?
3. which fiber type lasts about 8 seconds?
4. what type of athlete would use more slow - twitch fibers?
5. what energy source do fast - twitch glycolytic fibers rely on?
6. which type of fiber do you think is most common in weightlifters? why?

Explanation:

1. When holding a yoga pose, isometric contraction occurs as muscles maintain tension without changing length.
2. When running downhill, eccentric contraction controls the legs as muscles lengthen under tension.
3. Isometric contraction builds strength without visible movement as muscles contract against an immovable object.
4. Athletes need to train all three types of contractions (isometric, concentric, eccentric) to improve overall strength, power, endurance, and reduce injury risk.
5. Slow - Twitch (Type I) fibers are used for a marathon as they are endurance - based and use oxygen for long - lasting activity.
6. Sprinting uses Fast - Twitch Glycolytic (Type IIb) fibers which provide short, powerful bursts.
7. Fast - Twitch Glycolytic (Type IIb) fibers last about 8 seconds as they are for short, intense efforts.
8. Endurance athletes like long - distance runners use more slow - twitch fibers due to their endurance properties.
9. Fast - twitch glycolytic fibers rely on glycogen (anaerobic glycolysis) as an energy source for quick, powerful bursts.
10. Fast - Twitch Glycolytic (Type IIb) fibers are most common in weightlifters because weightlifting requires short, very powerful bursts of energy.

Answer:

1. Isometric contraction
2. Eccentric contraction
3. Isometric contraction
4. To improve overall strength, power, endurance, and reduce injury risk
5. Slow - Twitch (Type I) fibers
6. Fast - Twitch Glycolytic (Type IIb) fibers
7. Fast - Twitch Glycolytic (Type IIb) fibers
8. Endurance athletes
9. Glycogen (anaerobic glycolysis)
10. Fast - Twitch Glycolytic (Type IIb) fibers because weightlifting requires short, very powerful bursts of energy.