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Related Concept Videos

Muscle Recovery and Fatigue01:24

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
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The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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Somatic spinal reflexes are rapid, involuntary muscular responses to external stimuli that involve the somatic musculature and the spinal cord.
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Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
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Pain-evoked trunk muscle activity changes during fatigue and DOMS.

L H Larsen1,2, R P Hirata1, T Graven-Nielsen1

  • 1Department of Health Science and Technology, Faculty of Medicine, Center for Neuroplasticity and Pain (CNAP), SMI, Aalborg University, Denmark.

European Journal of Pain (London, England)
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Muscle pain from delayed onset muscle soreness (DOMS) significantly alters trunk muscle activity more than fatigue. Bilateral pain amplifies back muscle responses, while unilateral pain attenuates them, impacting stability during perturbations.

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Area of Science:

  • Neuromuscular control
  • Exercise physiology
  • Pain science

Background:

  • Muscle pain can alter trunk muscle activity, but its interaction with exercise-induced muscle fatigue and delayed onset muscle soreness (DOMS) requires clarification.
  • Understanding these interactions is crucial for managing musculoskeletal conditions and optimizing rehabilitation strategies.

Purpose of the Study:

  • To investigate the differential effects of fatigue and DOMS on trunk muscle activity during unpredictable surface perturbations.
  • To compare the impact of unilateral and bilateral low back pain (LBP) on muscle responses under these conditions.

Main Methods:

  • Nineteen healthy participants underwent controlled low back pain induction using hypertonic saline.
  • Trunk muscle activity was recorded during multi-directional surface perturbations under conditions of muscle fatigue (Day 1) and DOMS (Day 2).
  • Electromyographic (EMG) signals were analyzed to quantify changes in back and abdominal muscle activity (Delta-RMS-EMG) relative to baseline.

Main Results:

  • Delayed onset muscle soreness (DOMS) resulted in higher pain intensity and larger pain distribution areas compared to fatigue.
  • Back muscle activity (Delta-RMS-EMG) increased during bilateral pain and decreased during unilateral pain, with these effects being more pronounced in the DOMS condition.
  • Abdominal muscle activity showed no significant changes across conditions.

Conclusions:

  • Exercise-induced muscle soreness, particularly DOMS, leads to more pronounced alterations in trunk muscle responses to perturbations than fatigue.
  • The findings highlight the differential impact of pain intensity and distribution on neuromuscular control, with bilateral pain facilitating and unilateral pain attenuating back muscle activity.