Ch 11 Plyometrics In Rehabilitation

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  • 1/22 Questions

    Quick powerful movement involving ______ muscle and activating stretch-shortening cycle for stronger concentric contraction

    • Pre-stretching
    • Post-stretching
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About This Quiz

This quiz focuses on plyometrics within rehabilitation, assessing knowledge on muscle dynamics, the stretch-shortening cycle, and the roles of muscle components during different contractions. It's designed for learners in physical therapy and sports science, enhancing understanding of effective rehabilitation techniques.

Ch 11 Plyometrics In Rehabilitation - Quiz

Quiz Preview

  • 2. 

    Plyometric Prerequisites -Assess ability to produce explosive coordinated movement --Vertical or single leg jumping --Medicine ball toss

    • Biomechanical Evaluation

    • Stability Testing

    • Dynamic Movement Testing

    • Flexibility

    Correct Answer
    A. Dynamic Movement Testing
    Explanation
    Plyometric Prerequisites
    Biomechanical Evaluation
    -Should identify potential contraindications prior to initiation of program
    --Evaluation and functional tests
    -Require sound lower quarter mechanics
    --Stable base
    -Testing allows evaluation of base strength
    --Ensure appropriate stability
    -Eccentric strength is critical
    --Closed chain stability training may be necessary prior to engagement in program
    -Principle holds true for upper and lower extremity

    Stability Testing
    -Static stability
    --Ability to stabilize and control body
    --Postural stability
    --Centers on single leg strength and stability
    -Dynamic stability
    --Satisfactory static stability
    --Assess eccentric abilities
    --Stabilization jumping

    Dynamic Movement Testing
    -Assess ability to produce explosive coordinated movement
    --Vertical or single leg jumping
    --Medicine ball toss

    Flexibility
    -Requires general and specific flexibility
    -Program should begin with general warm-up and flexibility routine
    --Static and short dynamic stretching techniques
    -Ability to demonstrate static and dynamic control
    --Begin with single leg squats and low intensity in place plyometrics
    --Progress in slow deliberate fashion
    --Move to moderate intensity plyometrics
    --Advanced athletes with strong background will be able to perform ballistic-reactive drills

    Rate this question:

  • 3. 

    Plyometric Program Design -Horizontal movement is less stressful than vertical -Dependent on weight of athlete and technical proficiency

    • Direction of Body Movement

    • Weight of Athlete

    • Speed of Execution

    • External Load

    • Intensity

    • Volume

    • Frequency

    • Training Age

    • Recovery

    Correct Answer
    A. Direction of Body Movement
    Explanation
    Plyometric Program Design
    Direction of Body Movement
    -Horizontal movement is less stressful than vertical
    -Dependent on weight of athlete and technical proficiency

    Weight of Athlete
    -Heavier athlete = greater training demand

    Speed of Execution
    -Increasing speed of particular activity increases the demands being placed on the athlete

    External Load
    -Training demand is greatly increased by externally loading athlete
    -Should not slow speed of movement

    Intensity
    -Amount of effort exerted
    -Altered by activity performed (double  single leg)
    -Progress from simple to complex
    -Addition of external weight or increasing height

    Volume
    -Total amount of work performed
    -Total number of foot contacts
    --Varies inversely with intensity of exercise
    --Beginner = 75-100 (low intensity)
    --Advanced = 200-250 (low to moderate intensity)

    Frequency
    -Number of times exercise session is performed during a training cycle
    -Not known for plyometrics
    -Recommend 48-72 hours between sessions
    -Intensity dependent

    Training Age
    -Number of years athlete has been in formal training
    -Younger ages → training demand should be kept low

    Recovery
    -Time between sets
    -Power vs. Endurance
    --Power 1:3 or 1:4 ratio
    --Endurance 1:1 or 1:2
    -Emphasize eccentric loading and amortization

    Rate this question:

  • 4. 

    Plyometric Program Design -Heavier athlete = greater training demand

    • Direction of Body Movement

    • Weight of Athlete

    • Speed of Execution

    • External Load

    • Intensity

    • Volume

    • Frequency

    • Training Age

    • Recovery

    Correct Answer
    A. Weight of Athlete
    Explanation
    Plyometric Program Design
    Direction of Body Movement
    -Horizontal movement is less stressful than vertical
    -Dependent on weight of athlete and technical proficiency

    Weight of Athlete
    -Heavier athlete = greater training demand

    Speed of Execution
    -Increasing speed of particular activity increases the demands being placed on the athlete

    External Load
    -Training demand is greatly increased by externally loading athlete
    -Should not slow speed of movement

    Intensity
    -Amount of effort exerted
    -Altered by activity performed (double  single leg)
    -Progress from simple to complex
    -Addition of external weight or increasing height

    Volume
    -Total amount of work performed
    -Total number of foot contacts
    --Varies inversely with intensity of exercise
    --Beginner = 75-100 (low intensity)
    --Advanced = 200-250 (low to moderate intensity)

    Frequency
    -Number of times exercise session is performed during a training cycle
    -Not known for plyometrics
    -Recommend 48-72 hours between sessions
    -Intensity dependent

    Training Age
    -Number of years athlete has been in formal training
    -Younger ages → training demand should be kept low

    Recovery
    -Time between sets
    -Power vs. Endurance
    --Power 1:3 or 1:4 ratio
    --Endurance 1:1 or 1:2
    -Emphasize eccentric loading and amortization

    Rate this question:

  • 5. 

    Plyometric Program Design -Increasing speed of particular activity increases the demands being placed on the athlete

    • Direction of Body Movement

    • Weight of Athlete

    • Speed of Execution

    • External Load

    • Intensity

    • Volume

    • Frequency

    • Training Age

    • Recovery

    Correct Answer
    A. Speed of Execution
    Explanation
    Plyometric Program Design
    Direction of Body Movement
    -Horizontal movement is less stressful than vertical
    -Dependent on weight of athlete and technical proficiency

    Weight of Athlete
    -Heavier athlete = greater training demand

    Speed of Execution
    -Increasing speed of particular activity increases the demands being placed on the athlete

    External Load
    -Training demand is greatly increased by externally loading athlete
    -Should not slow speed of movement

    Intensity
    -Amount of effort exerted
    -Altered by activity performed (double  single leg)
    -Progress from simple to complex
    -Addition of external weight or increasing height

    Volume
    -Total amount of work performed
    -Total number of foot contacts
    --Varies inversely with intensity of exercise
    --Beginner = 75-100 (low intensity)
    --Advanced = 200-250 (low to moderate intensity)

    Frequency
    -Number of times exercise session is performed during a training cycle
    -Not known for plyometrics
    -Recommend 48-72 hours between sessions
    -Intensity dependent

    Training Age
    -Number of years athlete has been in formal training
    -Younger ages → training demand should be kept low

    Recovery
    -Time between sets
    -Power vs. Endurance
    --Power 1:3 or 1:4 ratio
    --Endurance 1:1 or 1:2
    -Emphasize eccentric loading and amortization

    Rate this question:

  • 6. 

    Plyometric Program Design -Number of years athlete has been in formal training -Younger ages → training demand should be kept low

    • Direction of Body Movement

    • Weight of Athlete

    • Speed of Execution

    • External Load

    • Intensity

    • Volume

    • Frequency

    • Training Age

    • Recovery

    Correct Answer
    A. Training Age
    Explanation
    Plyometric Program Design
    Direction of Body Movement
    -Horizontal movement is less stressful than vertical
    -Dependent on weight of athlete and technical proficiency

    Weight of Athlete
    -Heavier athlete = greater training demand

    Speed of Execution
    -Increasing speed of particular activity increases the demands being placed on the athlete

    External Load
    -Training demand is greatly increased by externally loading athlete
    -Should not slow speed of movement

    Intensity
    -Amount of effort exerted
    -Altered by activity performed (double  single leg)
    -Progress from simple to complex
    -Addition of external weight or increasing height

    Volume
    -Total amount of work performed
    -Total number of foot contacts
    --Varies inversely with intensity of exercise
    --Beginner = 75-100 (low intensity)
    --Advanced = 200-250 (low to moderate intensity)

    Frequency
    -Number of times exercise session is performed during a training cycle
    -Not known for plyometrics
    -Recommend 48-72 hours between sessions
    -Intensity dependent

    Training Age
    -Number of years athlete has been in formal training
    -Younger ages → training demand should be kept low

    Recovery
    -Time between sets
    -Power vs. Endurance
    --Power 1:3 or 1:4 ratio
    --Endurance 1:1 or 1:2
    -Emphasize eccentric loading and amortization

    Rate this question:

  • 7. 

    Goal is to _____ amount of time between _____loading contraction and _____force producing contraction

    • Decrease, eccentric, concentric

    • Increase, eccentric, concentric

    • Decrease, concentric, eccentric

    • Increase, concentric, eccentric

    Correct Answer
    A. Decrease, eccentric, concentric
    Explanation
    Goal is to decrease amount of time between eccentric loading contraction and concentric force producing contraction

    Rate this question:

  • 8. 

    Usually the focal point of motor control

    • Contractile Component

    • Series Elastic Component

    • Parallel Elastic Component

    Correct Answer
    A. Contractile Component
    Explanation
    Mechanical Characteristics
    Three components
    -Contractile component (CC)
    -Series elastic component (SEC)
    -Parallel elastic component (PEC)

    Concentric contraction
    -Force transferred externally through SEC

    Eccentric contraction
    -SEC lengthens and contributes to overall force output
    -Force output = CC + SEC

    Rate this question:

  • 9. 

    Plyometric Prerequisites -Static stability --Ability to stabilize and control body --Postural stability --Centers on single leg strength and stability -Dynamic stability --Satisfactory static stability --Assess eccentric abilities --Stabilization jumping

    • Biomechanical Evaluation

    • Stability Testing

    • Dynamic Movement Testing

    • Flexibility

    Correct Answer
    A. Stability Testing
    Explanation
    Plyometric Prerequisites
    Biomechanical Evaluation
    -Should identify potential contraindications prior to initiation of program
    --Evaluation and functional tests
    -Require sound lower quarter mechanics
    --Stable base
    -Testing allows evaluation of base strength
    --Ensure appropriate stability
    -Eccentric strength is critical
    --Closed chain stability training may be necessary prior to engagement in program
    -Principle holds true for upper and lower extremity

    Stability Testing
    -Static stability
    --Ability to stabilize and control body
    --Postural stability
    --Centers on single leg strength and stability
    -Dynamic stability
    --Satisfactory static stability
    --Assess eccentric abilities
    --Stabilization jumping

    Dynamic Movement Testing
    -Assess ability to produce explosive coordinated movement
    --Vertical or single leg jumping
    --Medicine ball toss

    Flexibility
    -Requires general and specific flexibility
    -Program should begin with general warm-up and flexibility routine
    --Static and short dynamic stretching techniques
    -Ability to demonstrate static and dynamic control
    --Begin with single leg squats and low intensity in place plyometrics
    --Progress in slow deliberate fashion
    --Move to moderate intensity plyometrics
    --Advanced athletes with strong background will be able to perform ballistic-reactive drills

    Rate this question:

  • 10. 

    Plyometric Program Design -Total amount of work performed -Total number of foot contacts --Varies inversely with intensity of exercise --Beginner = 75-100 (low intensity) --Advanced = 200-250 (low to moderate intensity)

    • Direction of Body Movement

    • Weight of Athlete

    • Speed of Execution

    • External Load

    • Intensity

    • Volume

    • Frequency

    • Training Age

    • Recovery

    Correct Answer
    A. Volume
    Explanation
    Plyometric Program Design
    Direction of Body Movement
    -Horizontal movement is less stressful than vertical
    -Dependent on weight of athlete and technical proficiency

    Weight of Athlete
    -Heavier athlete = greater training demand

    Speed of Execution
    -Increasing speed of particular activity increases the demands being placed on the athlete

    External Load
    -Training demand is greatly increased by externally loading athlete
    -Should not slow speed of movement

    Intensity
    -Amount of effort exerted
    -Altered by activity performed (double  single leg)
    -Progress from simple to complex
    -Addition of external weight or increasing height

    Volume
    -Total amount of work performed
    -Total number of foot contacts
    --Varies inversely with intensity of exercise
    --Beginner = 75-100 (low intensity)
    --Advanced = 200-250 (low to moderate intensity)

    Frequency
    -Number of times exercise session is performed during a training cycle
    -Not known for plyometrics
    -Recommend 48-72 hours between sessions
    -Intensity dependent

    Training Age
    -Number of years athlete has been in formal training
    -Younger ages → training demand should be kept low

    Recovery
    -Time between sets
    -Power vs. Endurance
    --Power 1:3 or 1:4 ratio
    --Endurance 1:1 or 1:2
    -Emphasize eccentric loading and amortization

    Rate this question:

  • 11. 

    Play an important role in providing stability and integrity to the individual fibers when a muscle is lengthened.

    • Contractile Component

    • Series Elastic Component

    • Parallel Elastic Component

    Correct Answer(s)
    A. Series Elastic Component
    A. Parallel Elastic Component
    Explanation
    Mechanical Characteristics
    Three components
    -Contractile component (CC)
    -Series elastic component (SEC)
    -Parallel elastic component (PEC)

    Concentric contraction
    -Force transferred externally through SEC

    Eccentric contraction
    -SEC lengthens and contributes to overall force output
    -Force output = CC + SEC

    Rate this question:

  • 12. 

    Concentric contraction

    • Force transferred externally through SEC

    • SEC lengthens and contributes to overall force output

    • Force output = CC + SEC

    Correct Answer
    A. Force transferred externally through SEC
    Explanation
    Mechanical Characteristics
    Three components
    -Contractile component (CC)
    -Series elastic component (SEC)
    -Parallel elastic component (PEC)

    Concentric contraction
    -Force transferred externally through SEC

    Eccentric contraction
    -SEC lengthens and contributes to overall force output
    -Force output = CC + SEC

    Rate this question:

  • 13. 

    Eccentric contraction

    • Force transferred externally through SEC

    • SEC lengthens and contributes to overall force output

    • Force output = CC + SEC

    Correct Answer(s)
    A. SEC lengthens and contributes to overall force output
    A. Force output = CC + SEC
    Explanation
    Mechanical Characteristics
    Three components
    -Contractile component (CC)
    -Series elastic component (SEC)
    -Parallel elastic component (PEC)

    Concentric contraction
    -Force transferred externally through SEC

    Eccentric contraction
    -SEC lengthens and contributes to overall force output
    -Force output = CC + SEC

    Rate this question:

  • 14. 

    Force production

    • Mechanoreceptors detect stretch resulting in alterations in muscle tone, motor execution and kinesthetic awareness

    • Muscle spindle response is graded by the rate of stretch

    • Rapid loading = greater firing frequency = greater reflexive contraction

    • During eccentric loading, muscle tension increases, triggering golgi tendon organ to initiate reduction in muscle excitation

    • While muscle spindle and GTO oppose each other – both contribute to increased force production

    • Length is proportional to amount of stretching force applied

    • Absolute strength of fiber

    • Increased force production is dependent on transition from eccentric to concentric contraction

    Correct Answer
    A. Increased force production is dependent on transition from eccentric to concentric contraction
    Explanation
    Neurophysiological Mechanism
    Proprioceptive stretch reflex
    -Mechanoreceptors detect stretch resulting in alterations in muscle tone, motor execution and kinesthetic awareness
    -Muscle spindle response is graded by the rate of stretch
    --Rapid loading = greater firing frequency = greater reflexive contraction
    -During eccentric loading, muscle tension increases, triggering golgi tendon organ to initiate reduction in muscle excitation
    -While muscle spindle and GTO oppose each other – both contribute to increased force production

    Degree of Muscle Fiber Elongation
    -Length is proportional to amount of stretching force applied
    -Absolute strength of fiber

    Force production
    -Increased force production is dependent on transition from eccentric to concentric contraction

    Rate this question:

  • 15. 

    Plyometric Prerequisites -Should identify potential contraindications prior to initiation of program --Evaluation and functional tests -Require sound lower quarter mechanics --Stable base -Testing allows evaluation of base strength --Ensure appropriate stability -Eccentric strength is critical --Closed chain stability training may be necessary prior to engagement in program -Principle holds true for upper and lower extremity

    • Biomechanical Evaluation

    • Stability Testing

    • Dynamic Movement Testing

    • Flexibility

    Correct Answer
    A. Biomechanical Evaluation
    Explanation
    Plyometric Prerequisites
    Biomechanical Evaluation
    -Should identify potential contraindications prior to initiation of program
    --Evaluation and functional tests
    -Require sound lower quarter mechanics
    --Stable base
    -Testing allows evaluation of base strength
    --Ensure appropriate stability
    -Eccentric strength is critical
    --Closed chain stability training may be necessary prior to engagement in program
    -Principle holds true for upper and lower extremity

    Stability Testing
    -Static stability
    --Ability to stabilize and control body
    --Postural stability
    --Centers on single leg strength and stability
    -Dynamic stability
    --Satisfactory static stability
    --Assess eccentric abilities
    --Stabilization jumping

    Dynamic Movement Testing
    -Assess ability to produce explosive coordinated movement
    --Vertical or single leg jumping
    --Medicine ball toss

    Flexibility
    -Requires general and specific flexibility
    -Program should begin with general warm-up and flexibility routine
    --Static and short dynamic stretching techniques
    -Ability to demonstrate static and dynamic control
    --Begin with single leg squats and low intensity in place plyometrics
    --Progress in slow deliberate fashion
    --Move to moderate intensity plyometrics
    --Advanced athletes with strong background will be able to perform ballistic-reactive drills

    Rate this question:

  • 16. 

    Plyometric Prerequisites -Requires general and specific flexibility -Program should begin with general warm-up and flexibility routine --Static and short dynamic stretching techniques -Ability to demonstrate static and dynamic control --Begin with single leg squats and low intensity in place plyometrics --Progress in slow deliberate fashion --Move to moderate intensity plyometrics --Advanced athletes with strong background will be able to perform ballistic-reactive drills

    • Biomechanical Evaluation

    • Stability Testing

    • Dynamic Movement Testing

    • Flexibility

    Correct Answer
    A. Flexibility
    Explanation
    Plyometric Prerequisites
    Biomechanical Evaluation
    -Should identify potential contraindications prior to initiation of program
    --Evaluation and functional tests
    -Require sound lower quarter mechanics
    --Stable base
    -Testing allows evaluation of base strength
    --Ensure appropriate stability
    -Eccentric strength is critical
    --Closed chain stability training may be necessary prior to engagement in program
    -Principle holds true for upper and lower extremity

    Stability Testing
    -Static stability
    --Ability to stabilize and control body
    --Postural stability
    --Centers on single leg strength and stability
    -Dynamic stability
    --Satisfactory static stability
    --Assess eccentric abilities
    --Stabilization jumping

    Dynamic Movement Testing
    -Assess ability to produce explosive coordinated movement
    --Vertical or single leg jumping
    --Medicine ball toss

    Flexibility
    -Requires general and specific flexibility
    -Program should begin with general warm-up and flexibility routine
    --Static and short dynamic stretching techniques
    -Ability to demonstrate static and dynamic control
    --Begin with single leg squats and low intensity in place plyometrics
    --Progress in slow deliberate fashion
    --Move to moderate intensity plyometrics
    --Advanced athletes with strong background will be able to perform ballistic-reactive drills

    Rate this question:

  • 17. 

    Plyometric Program Design -Amount of effort exerted -Altered by activity performed (double  single leg) -Progress from simple to complex -Addition of external weight or increasing height

    • Direction of Body Movement

    • Weight of Athlete

    • Speed of Execution

    • External Load

    • Intensity

    • Volume

    • Frequency

    • Training Age

    • Recovery

    Correct Answer
    A. Intensity
    Explanation
    Plyometric Program Design
    Direction of Body Movement
    -Horizontal movement is less stressful than vertical
    -Dependent on weight of athlete and technical proficiency

    Weight of Athlete
    -Heavier athlete = greater training demand

    Speed of Execution
    -Increasing speed of particular activity increases the demands being placed on the athlete

    External Load
    -Training demand is greatly increased by externally loading athlete
    -Should not slow speed of movement

    Intensity
    -Amount of effort exerted
    -Altered by activity performed (double  single leg)
    -Progress from simple to complex
    -Addition of external weight or increasing height

    Volume
    -Total amount of work performed
    -Total number of foot contacts
    --Varies inversely with intensity of exercise
    --Beginner = 75-100 (low intensity)
    --Advanced = 200-250 (low to moderate intensity)

    Frequency
    -Number of times exercise session is performed during a training cycle
    -Not known for plyometrics
    -Recommend 48-72 hours between sessions
    -Intensity dependent

    Training Age
    -Number of years athlete has been in formal training
    -Younger ages → training demand should be kept low

    Recovery
    -Time between sets
    -Power vs. Endurance
    --Power 1:3 or 1:4 ratio
    --Endurance 1:1 or 1:2
    -Emphasize eccentric loading and amortization

    Rate this question:

  • 18. 

    Plyometric Program Design -Number of times exercise session is performed during a training cycle -Not known for plyometrics -Recommend 48-72 hours between sessions -Intensity dependent

    • Direction of Body Movement

    • Weight of Athlete

    • Speed of Execution

    • External Load

    • Intensity

    • Volume

    • Frequency

    • Training Age

    • Recovery

    Correct Answer
    A. Frequency
    Explanation
    Plyometric Program Design
    Direction of Body Movement
    -Horizontal movement is less stressful than vertical
    -Dependent on weight of athlete and technical proficiency

    Weight of Athlete
    -Heavier athlete = greater training demand

    Speed of Execution
    -Increasing speed of particular activity increases the demands being placed on the athlete

    External Load
    -Training demand is greatly increased by externally loading athlete
    -Should not slow speed of movement

    Intensity
    -Amount of effort exerted
    -Altered by activity performed (double  single leg)
    -Progress from simple to complex
    -Addition of external weight or increasing height

    Volume
    -Total amount of work performed
    -Total number of foot contacts
    --Varies inversely with intensity of exercise
    --Beginner = 75-100 (low intensity)
    --Advanced = 200-250 (low to moderate intensity)

    Frequency
    -Number of times exercise session is performed during a training cycle
    -Not known for plyometrics
    -Recommend 48-72 hours between sessions
    -Intensity dependent

    Training Age
    -Number of years athlete has been in formal training
    -Younger ages → training demand should be kept low

    Recovery
    -Time between sets
    -Power vs. Endurance
    --Power 1:3 or 1:4 ratio
    --Endurance 1:1 or 1:2
    -Emphasize eccentric loading and amortization

    Rate this question:

  • 19. 

    Plyometric Program Design -Time between sets -Power vs. Endurance --Power 1:3 or 1:4 ratio --Endurance 1:1 or 1:2 -Emphasize eccentric loading and amortization

    • Direction of Body Movement

    • Weight of Athlete

    • Speed of Execution

    • External Load

    • Intensity

    • Volume

    • Frequency

    • Training Age

    • Recovery

    Correct Answer
    A. Recovery
    Explanation
    Plyometric Program Design
    Direction of Body Movement
    -Horizontal movement is less stressful than vertical
    -Dependent on weight of athlete and technical proficiency

    Weight of Athlete
    -Heavier athlete = greater training demand

    Speed of Execution
    -Increasing speed of particular activity increases the demands being placed on the athlete

    External Load
    -Training demand is greatly increased by externally loading athlete
    -Should not slow speed of movement

    Intensity
    -Amount of effort exerted
    -Altered by activity performed (double  single leg)
    -Progress from simple to complex
    -Addition of external weight or increasing height

    Volume
    -Total amount of work performed
    -Total number of foot contacts
    --Varies inversely with intensity of exercise
    --Beginner = 75-100 (low intensity)
    --Advanced = 200-250 (low to moderate intensity)

    Frequency
    -Number of times exercise session is performed during a training cycle
    -Not known for plyometrics
    -Recommend 48-72 hours between sessions
    -Intensity dependent

    Training Age
    -Number of years athlete has been in formal training
    -Younger ages → training demand should be kept low

    Recovery
    -Time between sets
    -Power vs. Endurance
    --Power 1:3 or 1:4 ratio
    --Endurance 1:1 or 1:2
    -Emphasize eccentric loading and amortization

    Rate this question:

  • 20. 

    Proprioceptive stretch reflex

    • Mechanoreceptors detect stretch resulting in alterations in muscle tone, motor execution and kinesthetic awareness

    • Muscle spindle response is graded by the rate of stretch

    • Rapid loading = greater firing frequency = greater reflexive contraction

    • During eccentric loading, muscle tension increases, triggering golgi tendon organ to initiate reduction in muscle excitation

    • While muscle spindle and GTO oppose each other – both contribute to increased force production

    • Length is proportional to amount of stretching force applied

    • Absolute strength of fiber

    • Increased force production is dependent on transition from eccentric to concentric contraction

    Correct Answer(s)
    A. Mechanoreceptors detect stretch resulting in alterations in muscle tone, motor execution and kinesthetic awareness
    A. Muscle spindle response is graded by the rate of stretch
    A. Rapid loading = greater firing frequency = greater reflexive contraction
    A. During eccentric loading, muscle tension increases, triggering golgi tendon organ to initiate reduction in muscle excitation
    A. While muscle spindle and GTO oppose each other – both contribute to increased force production
    Explanation
    Neurophysiological Mechanism
    Proprioceptive stretch reflex
    -Mechanoreceptors detect stretch resulting in alterations in muscle tone, motor execution and kinesthetic awareness
    -Muscle spindle response is graded by the rate of stretch
    --Rapid loading = greater firing frequency = greater reflexive contraction
    -During eccentric loading, muscle tension increases, triggering golgi tendon organ to initiate reduction in muscle excitation
    -While muscle spindle and GTO oppose each other – both contribute to increased force production

    Degree of Muscle Fiber Elongation
    -Length is proportional to amount of stretching force applied
    -Absolute strength of fiber

    Force production
    -Increased force production is dependent on transition from eccentric to concentric contraction

    Rate this question:

  • 21. 

    Degree of Muscle Fiber Elongation

    • Mechanoreceptors detect stretch resulting in alterations in muscle tone, motor execution and kinesthetic awareness

    • Muscle spindle response is graded by the rate of stretch

    • Rapid loading = greater firing frequency = greater reflexive contraction

    • During eccentric loading, muscle tension increases, triggering golgi tendon organ to initiate reduction in muscle excitation

    • While muscle spindle and GTO oppose each other – both contribute to increased force production

    • Length is proportional to amount of stretching force applied

    • Absolute strength of fiber

    • Increased force production is dependent on transition from eccentric to concentric contraction

    Correct Answer(s)
    A. Length is proportional to amount of stretching force applied
    A. Absolute strength of fiber
    Explanation
    Neurophysiological Mechanism
    Proprioceptive stretch reflex
    -Mechanoreceptors detect stretch resulting in alterations in muscle tone, motor execution and kinesthetic awareness
    -Muscle spindle response is graded by the rate of stretch
    --Rapid loading = greater firing frequency = greater reflexive contraction
    -During eccentric loading, muscle tension increases, triggering golgi tendon organ to initiate reduction in muscle excitation
    -While muscle spindle and GTO oppose each other – both contribute to increased force production

    Degree of Muscle Fiber Elongation
    -Length is proportional to amount of stretching force applied
    -Absolute strength of fiber

    Force production
    -Increased force production is dependent on transition from eccentric to concentric contraction

    Rate this question:

  • 22. 

    Plyometric Program Design -Training demand is greatly increased by externally loading athlete -Should not slow speed of movement

    • Direction of Body Movement

    • Weight of Athlete

    • Speed of Execution

    • External Load

    • Intensity

    • Volume

    • Frequency

    • Training Age

    • Recovery

    Correct Answer
    A. External Load
    Explanation
    Plyometric Program Design
    Direction of Body Movement
    -Horizontal movement is less stressful than vertical
    -Dependent on weight of athlete and technical proficiency

    Weight of Athlete
    -Heavier athlete = greater training demand

    Speed of Execution
    -Increasing speed of particular activity increases the demands being placed on the athlete

    External Load
    -Training demand is greatly increased by externally loading athlete
    -Should not slow speed of movement

    Intensity
    -Amount of effort exerted
    -Altered by activity performed (double  single leg)
    -Progress from simple to complex
    -Addition of external weight or increasing height

    Volume
    -Total amount of work performed
    -Total number of foot contacts
    --Varies inversely with intensity of exercise
    --Beginner = 75-100 (low intensity)
    --Advanced = 200-250 (low to moderate intensity)

    Frequency
    -Number of times exercise session is performed during a training cycle
    -Not known for plyometrics
    -Recommend 48-72 hours between sessions
    -Intensity dependent

    Training Age
    -Number of years athlete has been in formal training
    -Younger ages → training demand should be kept low

    Recovery
    -Time between sets
    -Power vs. Endurance
    --Power 1:3 or 1:4 ratio
    --Endurance 1:1 or 1:2
    -Emphasize eccentric loading and amortization

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Quiz Review Timeline (Updated): Jan 19, 2024 +

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  • Current Version
  • Jan 19, 2024
    Quiz Edited by
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  • Feb 19, 2012
    Quiz Created by
    Shinichiro
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