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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 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
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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Design Example: Frog Muscle Response01:14

Design Example: Frog Muscle Response

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A student is tasked to work on an intriguing experiment involving an RL (Resistor-Inductor) circuit to study the muscle response of a frog's leg to electrical stimulation. The RL circuit plays a crucial role in this experiment, providing the means to control and measure the electrical impulses that trigger muscle contraction.
When the switch connecting the RL circuit is closed, a brief muscle contraction is observed. This is because, at a steady state, the inductor acts like a short...
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Generation of Action Potential in Skeletal Muscles01:24

Generation of Action Potential in Skeletal Muscles

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Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the...
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Relaxation of Skeletal Muscles01:29

Relaxation of Skeletal Muscles

3.0K
The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open....
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Muscle Contraction01:10

Muscle Contraction

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In skeletal muscles, acetylcholine is released by nerve terminals at the motor endplate—the point of synaptic communication between motor neurons and muscle fibers. The binding of acetylcholine to its receptors on the sarcolemma allows entry of sodium ions into the cell and triggers an action potential in the muscle cell. Thus, electrical signals from the brain are transmitted to the muscle. Subsequently, the enzyme acetylcholinesterase breaks down acetylcholine to prevent excessive...
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Related Experiment Video

Updated: Jun 4, 2025

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People
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Effect of Reformer Spring Resistance Modifications on Core Muscle Activity During Basic Core Muscle Exercises.

Hee-Jeong Kim1, Jung-Ha Sung1, Jae-Kyun Ryu1,2

  • 1Graduate School of Physical Education, Kyung Hee University, Yongin 17104, Republic of Korea.

Healthcare (Basel, Switzerland)
|December 17, 2024
PubMed
Summary

Pilates Reformer spring resistance significantly impacts core muscle activity, with lower resistance increasing activation during exercises like hip roll and knee-off. This instability is crucial for rehabilitation and core stability programs.

Keywords:
EMGcore muscleselectromyographyreformertrunk stabilityunstable surface

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Kinesiology

Background:

  • Core muscles are vital for spinal stabilization during movement.
  • The Pilates Reformer is a key apparatus for core-focused exercises.
  • Understanding the influence of resistance on core muscle engagement is essential.

Purpose of the Study:

  • To investigate how varying Reformer spring resistance affects core muscle activity.
  • To determine the impact of platform instability on muscle engagement during Pilates exercises.

Main Methods:

  • 18 healthy females performed three core exercises (hip roll, knee-off, elephant).
  • Surface electromyography measured activity in six key core and leg muscles.
  • Exercises were performed under three conditions: fixed platform, low-resistance, and moderate-resistance springs.

Main Results:

  • Low-resistance springs significantly increased rectus abdominis and erector spinae activity during hip rolls.
  • Knee-off and elephant exercises showed increased rectus abdominis and multifidus activity with low-resistance springs.
  • Platform instability from springs enhanced core muscle activation across tested exercises.

Conclusions:

  • Reformer spring resistance, particularly low resistance, enhances core muscle activation.
  • Platform instability is a critical factor influencing core engagement in Pilates.
  • Consider spring-induced instability for optimizing rehabilitation and core stability training.