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Questions and Answers
Which of the following neural adaptations contributes to increased force production after strength training?
Which of the following neural adaptations contributes to increased force production after strength training?
What does rate coding refer to in the context of muscle force production?
What does rate coding refer to in the context of muscle force production?
Which training style is MOST effective for enhancing rate coding?
Which training style is MOST effective for enhancing rate coding?
How does motor unit recruitment change following strength training?
How does motor unit recruitment change following strength training?
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What is the primary function of muscular Electromyography (EMG) in studying neural adaptations?
What is the primary function of muscular Electromyography (EMG) in studying neural adaptations?
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According to research, what range of increase in force is possible due to rate coding?
According to research, what range of increase in force is possible due to rate coding?
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What potential impact could improved temporal and spatial motor recruitment have on force production?
What potential impact could improved temporal and spatial motor recruitment have on force production?
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What is the MOST direct effect of increased motor unit synchronization?
What is the MOST direct effect of increased motor unit synchronization?
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Which of the following best describes the bilateral limb deficit?
Which of the following best describes the bilateral limb deficit?
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What effect does resistance training have on motor unit synchronization?
What effect does resistance training have on motor unit synchronization?
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What is the primary effect of long-term potentiation on motor unit recruitment thresholds after training?
What is the primary effect of long-term potentiation on motor unit recruitment thresholds after training?
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What is the effect of potentiation on nerve impulses along previously used pathways?
What is the effect of potentiation on nerve impulses along previously used pathways?
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According to the provided text, which adaptation likely contributes the most to increased force production from a neural perspective?
According to the provided text, which adaptation likely contributes the most to increased force production from a neural perspective?
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What neural adaptation is suggested by Vila-Cha et al. (2010) in the Journal of Applied Physiology?
What neural adaptation is suggested by Vila-Cha et al. (2010) in the Journal of Applied Physiology?
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According to Carolan & Cafarelli (1992), what adaptation was analyzed in their study published in The Journal of Applied Physiology?
According to Carolan & Cafarelli (1992), what adaptation was analyzed in their study published in The Journal of Applied Physiology?
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What happens when both limbs contract together, according to the concept of bilateral limb deficit?
What happens when both limbs contract together, according to the concept of bilateral limb deficit?
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In the study assessing quad and hamstring activation during isometric knee extension, what was the primary finding regarding hamstring coactivation after 8 weeks of training?
In the study assessing quad and hamstring activation during isometric knee extension, what was the primary finding regarding hamstring coactivation after 8 weeks of training?
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What is a limitation regarding the current body of research focused on muscle coactivation?
What is a limitation regarding the current body of research focused on muscle coactivation?
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Besides hypertrophy, which morphological change in muscle can alter the force production?
Besides hypertrophy, which morphological change in muscle can alter the force production?
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What did Wells et al. (2014) discover about the vastus lateralis in relation to resistance training?
What did Wells et al. (2014) discover about the vastus lateralis in relation to resistance training?
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According to Dobrow and Gorgey (2016), what are use and disuse effects on skeletal muscle?
According to Dobrow and Gorgey (2016), what are use and disuse effects on skeletal muscle?
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Fry et al. (2003) investigated muscle fiber characteristics of competitive powerlifters. What aspect of muscle fibers did they analyze?
Fry et al. (2003) investigated muscle fiber characteristics of competitive powerlifters. What aspect of muscle fibers did they analyze?
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Why might a marathoner and a sprinter have different tissue adaptations?
Why might a marathoner and a sprinter have different tissue adaptations?
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What can be said about weightlifters, according to Serrano et al.?
What can be said about weightlifters, according to Serrano et al.?
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Flashcards
Maximal Activation
Maximal Activation
The peak level of muscle activation through motor unit recruitment and rate coding.
Motor Unit Recruitment
Motor Unit Recruitment
The process of activating additional motor units to increase force production during muscle contractions.
Rate Coding
Rate Coding
The increase in firing frequency of motor units as force demands rise, allowing for greater force production.
Neural Excitability
Neural Excitability
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Electromyography (EMG)
Electromyography (EMG)
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Transcranial Brain Stimulation
Transcranial Brain Stimulation
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Interpolated Twitch Technique
Interpolated Twitch Technique
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Co-activation of Antagonist Muscle
Co-activation of Antagonist Muscle
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Bilateral Limb Deficit
Bilateral Limb Deficit
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Training Effect on Bilateral Limb Deficit
Training Effect on Bilateral Limb Deficit
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Motor Unit Synchronization
Motor Unit Synchronization
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Effect of Training on Motor Units
Effect of Training on Motor Units
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Motor Neuron Excitability
Motor Neuron Excitability
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Potentiation of Nerve Impulses
Potentiation of Nerve Impulses
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Coordination in Force Development
Coordination in Force Development
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Co-activation of Antagonists
Co-activation of Antagonists
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Hamstring Coactivation
Hamstring Coactivation
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Isometric Training Effects
Isometric Training Effects
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Morphological Changes
Morphological Changes
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Fiber Type Ratio
Fiber Type Ratio
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Power Production in Athletes
Power Production in Athletes
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Load Influence on Response
Load Influence on Response
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Vastus Lateralis Adaptations
Vastus Lateralis Adaptations
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Control Group Findings
Control Group Findings
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Study Notes
Exercise and Force Production
- Santos et al. (2023) conducted a systematic review examining long-term neurophysiological adaptations induced by strength training, with a focus on cross-sectional studies.
Classic Digby Sale Training Response
- Training responses exhibit a phased structure, with distinct short-term and long-term adaptations related to strength gains.
- Short-term gains are primarily attributed to neural adaptations (e.g., motor unit recruitment, rate coding).
- Long-term adaptations are predominantly driven by muscular hypertrophy (e.g., increases in the size of muscle fibers).
- Neural improvements persist even after adaptations driven by muscular hypertrophy.
Neural Signaling and Force
- Force output is heavily influenced by neural signaling.
- Key neural mechanisms influencing force production include maximal activation (motor unit recruitment and rate coding), spinal cord connections (bilateral facilitation), neural excitability, and coordination (co-activation of antagonist muscles).
Measuring Neural Changes
- Muscular electromyography (EMG) is a key technique used to measure neural adaptations to exercise.
- EMG techniques encompass surface EMG, isolated motor neuron stimulation, transcranial brain stimulation, and interpolated twitch techniques.
EMG Methodology
- EMG is a method for recording the electrical activity of muscles.
- The technique involves deploying electrodes on the skin overlying the muscle.
- The raw EMG signals are complex and subsequently processed to identify individual motor unit action potentials (MUAPs).
Transcranial Brain Stimulation (TBS)
- A method used to stimulate the brain non-invasively. These techniques include transcranial magnetic stimulation procedures.
Interpolated Twitch Technique
- A method to assess the voluntary activation (VA) of muscles by creating precise stimuli.
- It employs a specific sequence of pulses to evoke a controlled motor unit response with a known firing pattern to quantify voluntary activation.
- This allows for analysis of the precise firing of motor units.
General Summary of Neural Adaptions
- Factors influencing force include neural activation of muscles.
- Training alters motor unit recruitment and rate of firing.
- Neural adaptations contribute to increased force generation with training.
Maximal Activation
- Peak torque and voluntary activation are influenced by fatigue in the plantar flexors.
- Resistance training impacts peak torque and voluntary activation.
Motor Unit Recruitment
- Training increases the activation of previously inactive motor units.
- This recruitment process leads to increased forceful output of the muscle.
Rate Coding
- Training increases the firing rate of motor units.
- The ability of motor unit firing increases during training, especially for large motor units.
- Speed and power training procedures appear the most effective methods of increasing rate coding.
Discharge Rate Endurance
- Measurements of motor unit discharge rates at different intensities reveal variations during endurance and strength training.
- Differences in response to training emphasize the varied impacts based on training type.
Bilateral Limb Deficit
- The neural system allocates resources differently when contracting both limbs compared to just one.
- Strength training appears to improve bilateral limb facilitation.
Motor Unit Synchronization
- Variability in motor unit firing sequences declines.
- More motor units fire simultaneously, leading to more powerful contractions.
- This precise temporal synchronization contributes effectively to increased muscular output.
Motor Neuron Excitability
- Training can improve the ability to activate motor units more readily.
- This responsiveness is associated with long‐term potentiation of the relevant tissue.
Motor Unit Conduction Velocity
- Training influences the speed at which motor signals travel along motor units, affecting the force output.
- Enhanced conduction velocity is observed in specific muscle groups following training interventions.
Corticospinal Excitability
- Strength in signaling nerve impulses along pathways increases.
- This is a result of the previous use of those paths (short or long term).
- Training improves the functional capability of the pathways in the nervous system.
Coordination
- Coordination is a key factor in efficiently generating force.
- Changes in how the body moves and activates muscle groups are central contributors to increased force.
Co-activation of Antagonists
- Co-activation of antagonist muscles (e.g. biceps and triceps) reduces during training, leading to more efficient force production.
Limitations of Existing Research
- Much of the existing literature has focused on isometric exercises. Further studies are needed in open-chain situations to confirm findings.
- The role of antagonist co-activation in dynamic movements remains unclear
Muscular Adaptations
- Muscle adaptions are more extensive than just hypertrophy.
- Adaptations encompass functional changes like alterations in pennation angle and fiber type distributions.
Muscle Fiber Characteristics
- Muscle fibers (e.g., fast-twitch and slow-twitch) have distinct characteristics related to power potential and endurance.
Muscle adaptations and Response to Training
- Specialized muscle fiber distribution and characteristics can be observed based on specific types of training
- Training effectively leads to specific muscular adaptations in response to the demands place
The Influence of Load on Response
- Increased training load may elicit differential adaptations in the muscle fibers.
- Variations in neural adaptations may also be influenced by changes in training load
Take-home Message
- Hypertrophy is essential for force output.
- Neural adaptations, fiber-type shifts, and selective hypertrophy are pivotal in optimizing strength and power.
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Description
Test your knowledge on neural adaptations related to strength training. This quiz covers topics like rate coding, motor unit recruitment, and the effects of resistance training on force production. Explore the mechanisms behind muscle force increase and motor unit synchronization.