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Exercise and Muscle Performance01:27

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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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Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
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Early-Phase Satellite Cell and Myonuclear Domain Adaptations to Slow-Speed vs. Traditional Resistance Training

Jennifer R Herman-Montemayor1, Robert S Hikida, Robert S Staron

  • 11Department of Biomedical Sciences, College of Osteopathic Medicine, Rocky Vista University, Parker, Colorado; and 2Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, Ohio.

Journal of Strength and Conditioning Research
|March 11, 2015
PubMed
Summary

Slow-speed resistance training enhanced satellite cell (SC) content and myonuclear domain (MND) more than normal-speed training at similar intensities. However, high-intensity, normal-speed training yielded the most significant muscle fiber adaptations overall.

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Area of Science:

  • Exercise Physiology
  • Muscle Biology
  • Cellular Adaptations

Background:

  • Resistance training is known to induce muscle adaptations.
  • Investigating the effects of different training speeds on cellular adaptations like satellite cell (SC) content and myonuclear domain (MND) is crucial for optimizing training protocols.
  • Previous research has not fully elucidated the specific impacts of slow-speed versus traditional-speed resistance training on these cellular markers.

Purpose of the Study:

  • To compare the effects of 6-week slow-speed (SS) versus traditional-speed resistance training programs on satellite cell (SC) content and myonuclear domain (MND) in untrained females.
  • To determine if different training intensities and speeds elicit varying degrees of muscle fiber adaptations.

Main Methods:

  • Thirty-four untrained females were assigned to SS, traditional strength (TS), traditional muscular endurance (TE), or control (C) groups.
  • Training involved leg press, squat, and knee extension exercises 2-3 days/week for 6 weeks.
  • SS performed 6-10RM with slow contractions (10s concentric, 4s eccentric), TE performed 20-30RM at normal speed, and TS performed 6-10RM at normal speed (1-2s per contraction).

Main Results:

  • Satellite cell (SC) content significantly increased in type I, IIA, IIAX, and IIX fibers with TS training.
  • SS training led to increased SC content in type IIAX and IIX fibers only.
  • Myonuclear domain (MND) increased across all fiber types with TS, while SS training only increased MND in type IIA fibers. No changes were observed in TE or C groups.

Conclusions:

  • Slow-speed resistance training, compared to normal-speed training at similar intensities, induced greater increases in satellite cell (SC) content and myonuclear domain (MND).
  • High-intensity, normal-speed resistance training (TS) resulted in the most comprehensive muscle fiber adaptations across all measured variables.
  • Training speed and intensity are critical factors influencing cellular adaptations in skeletal muscle.