Neural Adaptations in Strength Training
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Questions and Answers

Which of the following neural adaptations contributes to increased force production after strength training?

  • Decreased motor unit recruitment
  • Increased co-activation of antagonist muscles
  • Increased maximal activation (correct)
  • Reduced rate coding
  • What does rate coding refer to in the context of muscle force production?

  • The number of motor units recruited
  • The speed of muscle contraction
  • The frequency at which a motor unit fires (correct)
  • The force generated per motor unit
  • Which training style is MOST effective for enhancing rate coding?

  • Endurance training
  • Power and speed training (correct)
  • Isometric training
  • Flexibility training
  • How does motor unit recruitment change following strength training?

    <p>Previously inactive motor units are activated (B)</p> Signup and view all the answers

    What is the primary function of muscular Electromyography (EMG) in studying neural adaptations?

    <p>Assessing electrical activity of muscles (B)</p> Signup and view all the answers

    According to research, what range of increase in force is possible due to rate coding?

    <p>2-4 fold (B)</p> Signup and view all the answers

    What potential impact could improved temporal and spatial motor recruitment have on force production?

    <p>Increased force by optimizing muscle activation patterns (D)</p> Signup and view all the answers

    What is the MOST direct effect of increased motor unit synchronization?

    <p>Greater force output (C)</p> Signup and view all the answers

    Which of the following best describes the bilateral limb deficit?

    <p>The force of combined single limbs is higher than the force of both limbs contracting together. (D)</p> Signup and view all the answers

    What effect does resistance training have on motor unit synchronization?

    <p>It decreases the variability in the temporal sequence of motor unit firing, leading to more units firing at the same time. (A)</p> Signup and view all the answers

    What is the primary effect of long-term potentiation on motor unit recruitment thresholds after training?

    <p>It is easier to activate the muscle. (D)</p> Signup and view all the answers

    What is the effect of potentiation on nerve impulses along previously used pathways?

    <p>It increases the strength of nerve impulses. (D)</p> Signup and view all the answers

    According to the provided text, which adaptation likely contributes the most to increased force production from a neural perspective?

    <p>Coordination of movement and muscle activity. (C)</p> Signup and view all the answers

    What neural adaptation is suggested by Vila-Cha et al. (2010) in the Journal of Applied Physiology?

    <p>Motor unit behaviour during submaximal contractions (B)</p> Signup and view all the answers

    According to Carolan & Cafarelli (1992), what adaptation was analyzed in their study published in The Journal of Applied Physiology?

    <p>Adaptations in coactivation after isometric resistance training. (B)</p> Signup and view all the answers

    What happens when both limbs contract together, according to the concept of bilateral limb deficit?

    <p>The neural system divides resources to engage both units. (D)</p> Signup and view all the answers

    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?

    <p>Hamstring coactivation decreased by 20% in the first week and a further 13% in the second week. (C)</p> Signup and view all the answers

    What is a limitation regarding the current body of research focused on muscle coactivation?

    <p>Study isometrically in fully stable situations (D)</p> Signup and view all the answers

    Besides hypertrophy, which morphological change in muscle can alter the force production?

    <p>Increased pennation angle. (D)</p> Signup and view all the answers

    What did Wells et al. (2014) discover about the vastus lateralis in relation to resistance training?

    <p>It exhibits non-homogenous adaptations with resistance training. (C)</p> Signup and view all the answers

    According to Dobrow and Gorgey (2016), what are use and disuse effects on skeletal muscle?

    <p>Impact non-paralyzed and paralyzed skeletal muscles. (B)</p> Signup and view all the answers

    Fry et al. (2003) investigated muscle fiber characteristics of competitive powerlifters. What aspect of muscle fibers did they analyze?

    <p>Fiber type ratio. (C)</p> Signup and view all the answers

    Why might a marathoner and a sprinter have different tissue adaptations?

    <p>Sprinters have a different distribution of fiber types. (C)</p> Signup and view all the answers

    What can be said about weightlifters, according to Serrano et al.?

    <p>They have a low proportion of IIx, but a very high proportion of IIa fibers. (D)</p> Signup and view all the answers

    Flashcards

    Maximal Activation

    The peak level of muscle activation through motor unit recruitment and rate coding.

    Motor Unit Recruitment

    The process of activating additional motor units to increase force production during muscle contractions.

    Rate Coding

    The increase in firing frequency of motor units as force demands rise, allowing for greater force production.

    Neural Excitability

    The ability of neurons to respond to stimulation, influencing muscle activation and force production.

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    Electromyography (EMG)

    A technique for measuring the electrical activity of muscles, aiding in the assessment of muscle activation.

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    Transcranial Brain Stimulation

    A non-invasive method used to stimulate the brain and assess the neural control of muscle activity.

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    Interpolated Twitch Technique

    A method to evaluate muscle activation by delivering electrical stimulation during contractions to measure force levels.

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    Co-activation of Antagonist Muscle

    Simultaneous activation of opposing muscles to stabilize joints and improve control during movement.

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    Bilateral Limb Deficit

    Condition where both limbs contract together, resulting in lower force than if one limb contracts alone.

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    Training Effect on Bilateral Limb Deficit

    Training can reduce bilateral limb deficit, enhancing performances of both limbs simultaneously.

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    Motor Unit Synchronization

    The timing pattern of motor unit firing during muscle contraction can vary; training reduces this variability.

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    Effect of Training on Motor Units

    Training leads to decreased variability in motor unit firing, enhancing synchronization.

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    Motor Neuron Excitability

    Increased readiness to activate motor units, seen with reduced recruitment thresholds after training.

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    Potentiation of Nerve Impulses

    Increased nerve impulse strength along pathways that have been frequently activated, occurring with training.

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    Coordination in Force Development

    Improved coordination of movement and muscle activity leads to increased force from a neural perspective.

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    Co-activation of Antagonists

    Simultaneous activation of opposing muscles to stabilize and enhance force production during movements.

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    Hamstring Coactivation

    The simultaneous activation of the hamstring and quadriceps during knee movements.

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    Isometric Training Effects

    Changes in muscle activation and coactivation from resistance training without joint movement.

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    Morphological Changes

    Alterations in muscle structure, including pennation angle and cross-sectional area (CSA).

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    Fiber Type Ratio

    Distribution of different muscle fibers, i.e., fast-twitch vs slow-twitch.

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    Power Production in Athletes

    High power athletes have a different muscle fiber distribution than endurance athletes.

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    Load Influence on Response

    The degree of external load can affect muscle adaptation and fiber composition.

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    Vastus Lateralis Adaptations

    The vastus lateralis shows non-homogenous adaptations after resistance training.

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    Control Group Findings

    The group that does not undergo training shows no change in muscle coactivation.

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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.

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