Explain the primary physiological cause of DOMS, as described in the video.

DOMS is primarily caused by micro-tears and localized muscle damage resulting from eccentric muscle contractions, leading to inflammation, weakness, tenderness, and pain.

Describe what happens to sarcomeres during eccentric contractions that leads to muscle damage.

During eccentric contractions, greater force per muscle fiber area leads to micro-tears and damage to sarcomeres, resulting in Z-line streaming.

What evidence supports the claim that muscle damage occurs during activities involving eccentric contractions?

Elevated levels of intramuscular proteins like creatine kinase, myoglobin, and lactate dehydrogenase in the blood indicate muscle cell membrane damage.

What Causes Muscle Soreness? Lesson Plan for Grade 11th Grade

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Learning Objective

I can explain the physiological causes of delayed onset muscle soreness (DOMS).

1
Muscle soreness felt during exercise is primarily caused by a sustained isometric contraction that reduces blood flow and leads to acidosis.
2
Muscle cramps are thought to be caused by electrolyte imbalances or altered neuromuscular control, and can be relieved by passive stretching.
3
Delayed Onset Muscle Soreness (DOMS) is caused by eccentric contractions leading to muscle damage, and is NOT caused by lactic acid.

What Causes Muscle Soreness?

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Learning Objective

Warm-Up Video

Key Concepts

Practice Questions

Exit Ticket

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