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Related Concept Videos

Exercise and Muscle Performance01:27

Exercise and Muscle Performance

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...
Isotonic and Isometric Muscle Contractions01:22

Isotonic and Isometric Muscle Contractions

Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
Isotonic contractions
Isotonic contractions occur when a muscle changes length while the...
Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

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...
Exercise and Cardiac Output01:17

Exercise and Cardiac Output

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 met...
Motor Unit Stimulation01:20

Motor Unit Stimulation

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.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
Muscle Contraction01:10

Muscle Contraction

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 muscle...

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Related Experiment Video

Updated: Jun 26, 2026

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People
12:59

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Published on: July 5, 2017

Concentric resistance training increases muscle strength without affecting microcirculation.

Marc-André Weber1, Wulf Hildebrandt, Leif Schröder

  • 1Department of Diagnostic and Interventional Radiology, University of Heidelberg, Heidelberg, Germany. MarcAndre.Weber@med.uni-heidelberg.de

European Journal of Radiology
|January 16, 2009
PubMed
Summary
This summary is machine-generated.

Resistance strength training significantly increases muscle size and strength. However, this study found no significant changes in resting skeletal muscle microcirculation or energy metabolites in vivo.

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Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People
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Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

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Dosage-Adjusted Resistance Training in Mice with a Reduced Risk of Muscle Damage
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Dosage-Adjusted Resistance Training in Mice with a Reduced Risk of Muscle Damage

Published on: August 31, 2022

Area of Science:

  • Exercise Physiology
  • Skeletal Muscle Biology
  • Cardiovascular Physiology

Background:

  • Endurance training is known to enhance muscular capillarity.
  • The effects of resistance training on muscle microcirculation remain debated.
  • Understanding microcirculatory adaptations is crucial for optimizing training protocols.

Purpose of the Study:

  • To investigate the impact of resistance strength training on resting skeletal muscle microcirculation in vivo.
  • To determine if resistance training influences capillary density and blood flow parameters.
  • To assess changes in muscle energy metabolites following resistance training.

Main Methods:

  • Thirty-nine middle-aged adults underwent 16 sessions of isokinetic resistance training.
  • Muscle cross-sectional area (CSA) and strength were measured.
  • Capillarization was assessed via muscle biopsies.
  • In vivo microcirculation was evaluated using contrast-enhanced ultrasound.
  • Muscle energy metabolites were quantified using magnetic resonance spectroscopy.

Main Results:

  • Successful training resulted in significant increases in quadriceps femoris muscle CSA and strength.
  • No significant changes were observed in capillary density (ex vivo).
  • Resting muscle blood flow, velocity, and high-energy phosphate levels remained unchanged post-training.

Conclusions:

  • Resistance strength training effectively enhances muscle size and strength.
  • The observed muscle adaptations occur without altering resting skeletal muscle microcirculation in vivo.
  • These findings suggest that microcirculatory adaptations may not be a primary driver of strength gains from this type of training.