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Chapter

BPK 143 Chapter Notes -Stretching, Mattress, Lactic Acid


Department
Biomedical Physio & Kines
Course Code
BPK 143
Professor
Tony Leyland

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KIN 143 UNIT 7
Study Questions
In the discussion on back health there is some overlap with the anatomy and back
strength exercises discussed in Unit 6.
1. Discuss the arguments for and against including static stretching in a warm-up
routine.
For:
1. Decreases risk of injury by increasing flexibility prior to activity
2. Increasing flexibility allows for greater ROM for athletic
performance
Against:
1. Increased stretchability causes tissues to rupture more easily
2. No effect on activities where muscle length is not a factor. Ex.
Jogging
3. Stretching doesn’t affect muscles during eccentric activity where
muscle strains usually occur
4. Stretching can produce damage to structures within muscle fibre
5. Can mask muscle pain leading to people overdoing it
6. May weaken the muscle
2. Discuss the arguments for and against including ballistic stretching in a warm-up
routine.
For:
1. Activities are dynamic in nature so ballistic stretching will adhere
to these dynamic activities, increasing flexibility when moving
2. Shown to be effective, but more research required
3. Can be performed in a team to promote camaraderie
4. Less boring
Against:
1. Heighten activity of stretch receptors, causing more injury risk
2. Can cause reflex action in muscles which will make it harder to
stretch
3. Describe two flexibility/warm-up exercises that are considered to be potentially
dangerous to the knee joint. Explain why each exercise is considered to be
potentially harmful.
Single or double leg inverted hurdler’s stretch
1. Results in over stretching tissues, crushing, pinching nerves and
jamming joints in knee
Hurdler Stretch
1. The bent knee will be over stretched. Tissue and nerve damage.
4. Describe two flexibility/warm-up exercises that are considered to be potentially
dangerous to the lower back. Explain why each exercise is considered to be
potentially harmful.
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