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Excitation-Contraction Coupling in Skeletal Muscles01:20

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Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
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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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Core Muscle Activation in Suspension Training Exercises.

Giovanni Cugliari1,2, Gennaro Boccia3,4

  • 1Department of Brain and Behavioral Sciences, Unit of Medical and Genomic Statistics, University of Pavia, Italy.

Journal of Human Kinetics
|May 5, 2017
PubMed
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Suspension training exercises like roll-out and bodysaw show high muscle activation for the rectus abdominis and oblique muscles. These findings help select effective suspension core exercises for strength training.

Keywords:
abdominal musclescore stabilitycore strengthelectromyography

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Area of Science:

  • Exercise Physiology
  • Biomechanics
  • Sports Science

Background:

  • Core training is crucial for athletic performance and injury prevention.
  • Suspension training offers a versatile modality for exercise.
  • Understanding muscle activation patterns is key to optimizing exercise selection.

Purpose of the Study:

  • To quantitatively assess muscle activation during four common suspension core exercises.
  • To compare the effectiveness of suspension roll-out, bodysaw, pike, and knee-tuck exercises.
  • To provide evidence-based guidance for selecting suspension core exercises.

Main Methods:

  • A prospective, single-group, repeated measures laboratory study.
  • Seventeen active male participants performed four suspension core exercises.
  • Surface electromyography (sEMG) measured activation in rectus abdominis, obliques, and erector spinae muscles.

Main Results:

  • The roll-out exercise demonstrated the highest activation for rectus abdominis and oblique muscles.
  • Roll-out and bodysaw exercises achieved over 60% maximal voluntary contraction (MVC) for rectus abdominis and external obliques.
  • Significant differences in muscle activation were observed across the four exercises.

Conclusions:

  • Suspension roll-out and bodysaw exercises are highly effective for targeting rectus abdominis and external oblique muscles.
  • This study provides quantitative data to inform the selection of suspension exercises for core strength training.
  • Exercise professionals can utilize these findings to design more targeted and effective core workouts.