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Related Concept Videos

Exercise and Muscle Performance01:27

Exercise and Muscle Performance

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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.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
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Exercise and Cardiovascular Response01:20

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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
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Exercise and Cardiac Output01:17

Exercise and Cardiac Output

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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be...
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Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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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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Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

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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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GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

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Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
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Related Experiment Video

Updated: Mar 13, 2026

Human Skeletal Muscle Biopsy Procedures Using the Modified Bergström Technique
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OGG1 increases exercise endurance via elevated skeletal muscle FGF21.

Bhavya Blaze1, Priyanka Sharma1, Bhavya Prakash Gupta2

  • 1Department of Nutritional Sciences, Rutgers University, New Brunswick, New Jersey, USA; Rutgers Center for Lipid Research, Rutgers University, New Brunswick, New Jersey, USA.

The Journal of Biological Chemistry
|March 11, 2026
PubMed
Summary
This summary is machine-generated.

Overexpression of 8-oxoguanine DNA glycosylase (OGG1) enhances muscle endurance by increasing mitochondrial content and FGF21 signaling. This discovery highlights OGG1

Keywords:
base excision repairexercise tolerancefibroblast growth factormitochondriamyokineskeletal muscle

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Area of Science:

  • Genomic integrity and DNA repair
  • Metabolic health and mitochondrial function
  • Muscle physiology and endurance

Background:

  • The base excision repair (BER) pathway, initiated by DNA glycosylases like 8-oxoguanine DNA glycosylase (OGG1), is crucial for maintaining genomic stability against oxidative damage.
  • OGG1 is implicated in various diseases, including cancers and neurodegenerative disorders, and its proteins influence metabolic health.
  • Previous studies show OGG1-deficient mice are prone to obesity, while OGG1 overexpression reverses these metabolic issues.

Purpose of the Study:

  • To investigate the novel effects of OGG1 overexpression on muscle physiology and endurance.
  • To explore the molecular mechanisms underlying OGG1's impact on muscle function and metabolic health.

Main Methods:

  • Utilized OGG1-transgenic (Ogg1Tg) mice with overexpressed human OGG1.
  • Assessed muscle endurance, mitochondrial content and size, and gene/protein expression in skeletal muscle.
  • Measured circulating FGF21 levels and peripheral markers of FGF21 action.

Main Results:

  • OGG1 overexpression led to a significant, over 3-fold increase in muscle endurance in Ogg1Tg mice.
  • Mitochondrial content and size were significantly increased in the skeletal muscle of Ogg1Tg mice.
  • Selective upregulation of the myokine Fgf21 in skeletal muscle was observed, alongside elevated circulating FGF21 and peripheral markers of its action.

Conclusions:

  • Skeletal muscle OGG1 plays a novel role in enhancing muscle endurance.
  • OGG1 overexpression improves mitochondrial health and function within skeletal muscle.
  • The observed benefits are mediated through increased FGF21 secretion and signaling, linking OGG1 to improved metabolic and muscle performance.