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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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Skeletal muscle relaxants are widely used for muscle paralysis and relieving pain following any muscle injury or stiffness. However, depending on the drug type, they can have adverse effects that range from mild to severe. Usually, nondepolarizing neuromuscular blockers have minimal side effects. For example, drugs like d-tubocurarine, cisatracurium, and rocuronium cause hypotension, whereas drugs like baclofen, when stopped abruptly, can lead to the recurrence of spastic conditions.
Unlike...
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Skeletal muscle relaxants are a group of drugs that can reduce muscle stiffness and induce temporary paralysis to relieve pain. These agents can act centrally to reduce muscle tone or spasms in painful conditions such as multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), or spinal injuries; they are called antispasmodics or spasmolytics.
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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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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
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Related Experiment Video

Updated: Mar 21, 2026

The Use of Thermal Infra-Red Imaging to Detect Delayed Onset Muscle Soreness
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The Use of Thermal Infra-Red Imaging to Detect Delayed Onset Muscle Soreness

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Perceived Muscle Soreness in Recreational Female Runners.

D Burnett1, K Smith1, C Smeltzer1

  • 1Department of Kinesiology, University of Central Missouri, Warrensburg, Mo.

International Journal of Exercise Science
|May 17, 2016
PubMed
Summary
This summary is machine-generated.

Perceived muscle soreness, not rating of perceived exertion, effectively monitors exercise intensity in female runners experiencing delayed onset muscle soreness (DOMS). DOMS also negatively impacts running economy.

Keywords:
delayed onset muscle sorenessmuscle strainovertrainingoveruse injuryrecovery

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biomedical Science

Background:

  • Delayed onset muscle soreness (DOMS) is a common issue for runners.
  • Understanding how DOMS affects physiological markers and perceived exertion is crucial for training.
  • Running economy is a key performance indicator that can be impacted by muscle damage.

Purpose of the Study:

  • To investigate the correlation between rating of perceived exertion (RPE) and perceived muscle soreness in female runners during DOMS.
  • To assess the impact of DOMS on running economy.
  • To determine the efficacy of RPE versus perceived muscle soreness in monitoring exercise intensity.

Main Methods:

  • Six female recreational runners underwent a 30-min downhill run at -15% grade.
  • Running economy and perceived muscle soreness were measured before, immediately after, and for four days following the downhill run.
  • Creatine kinase levels and oxygen consumption were also monitored.

Main Results:

  • Perceived muscle soreness significantly increased post-downhill run, peaking two days later.
  • Creatine kinase levels and oxygen consumption elevated after the downhill run.
  • Rating of perceived exertion (RPE) did not show significant changes throughout the study period.

Conclusions:

  • Perceived muscle soreness is a more effective indicator of exercise intensity than RPE for female runners with DOMS.
  • DOMS adversely affects running economy in female runners.
  • Monitoring perceived muscle soreness can aid in managing training loads during recovery from muscle damage.