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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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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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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.
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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.
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Energy Supply for Muscle Contraction01:25

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Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...
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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.
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Human Skeletal Muscle Biopsy Procedures Using the Modified Bergström Technique
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Exercise training and Beta-alanine-induced muscle carnosine loading.

Tine Bex1, Weiliang Chung1, Audrey Baguet1

  • 1Department of Movement and Sports Sciences, Ghent University , Ghent , Belgium.

Frontiers in Nutrition
|May 20, 2015
PubMed
Summary

Beta-alanine (BA) supplementation increases muscle carnosine. Both high-volume (HV) and high-intensity (HI) exercise training enhanced BA-induced carnosine loading in untrained individuals, with no significant difference between HV and HI protocols.

Keywords:
beta-alaninecarnosine loadingmuscle contractionssport supplementstraining

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Area of Science:

  • Exercise Physiology
  • Nutritional Biochemistry
  • Sports Science

Background:

  • Beta-alanine (BA) supplementation is known to increase muscle carnosine levels, which can enhance high-intensity exercise performance.
  • Athletes' trained muscles show greater carnosine increases post-BA supplementation than untrained muscles, suggesting training status influences loading.
  • The role of acute exercise stimuli versus chronic training adaptations in this process remains unclear.

Purpose of the Study:

  • To investigate the impact of high-volume (HV) and high-intensity (HI) exercise on beta-alanine-induced muscle carnosine loading in untrained individuals.
  • To determine if specific exercise training protocols can optimize carnosine accumulation during BA supplementation.

Main Methods:

  • Twenty-eight untrained participants received 6.4 g/day of BA for 23 days.
  • Participants were assigned to a control group, a high-volume (HV) cycling group (75-90 min at 35-45% Wmax), or a high-intensity (HI) cycling group (3-5 x 30s at 165% Wmax).
  • Muscle carnosine content in the soleus and gastrocnemius medialis was measured using proton magnetic resonance spectroscopy.

Main Results:

  • Both HV and HI training groups showed a significantly greater absolute increase in average muscle carnosine content compared to the control group.
  • The HV group increased average carnosine by +2.95 mM (P=0.046) and the HI group by +3.26 mM (P=0.028), versus +1.91 mM in the control group.
  • No significant difference in carnosine loading was observed between the HV and HI training groups.

Conclusions:

  • Neither high-volume nor high-intensity exercise training demonstrated a significant difference in enhancing beta-alanine-induced muscle carnosine loading in the soleus and gastrocnemius muscles.
  • A potential small cumulative effect of exercise on BA supplementation efficiency may exist, though not statistically significant at the individual muscle level.
  • These findings suggest that while exercise may aid carnosine loading, specific protocols do not offer a distinct advantage over others in untrained individuals.