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Related Concept Videos

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 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.
Endurance exercises
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Running versus strength-based warm-up: acute effects on isometric knee extension function.

Olivier Girard1, Yvan Carbonnel, Robin Candau

  • 1Research and Education Centre, ASPETAR, Qatar Orthopaedic and Sports Medicine Hospital, PO Box 29222, Doha, Qatar. oliv.girard@gmail.com

European Journal of Applied Physiology
|April 10, 2009
PubMed
Summary

Both running-based (R(WU)) and strength-based (S(WU)) warm-ups enhance knee extensor force by improving muscle activation. These protocols show similar effects on muscle contractile properties and neural responses.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Neuromuscular Function

Background:

  • Warm-up protocols are crucial for optimizing athletic performance and injury prevention.
  • Understanding the specific physiological adaptations induced by different warm-up types is essential for training prescription.

Purpose of the Study:

  • To compare the effects of running-based (R(WU)) and strength-based (S(WU)) warm-ups on neuromuscular and contractile properties of knee extensors.
  • To determine if different warm-up strategies yield distinct adaptations in muscle force production and activation.

Main Methods:

  • Ten trained subjects underwent neuromuscular testing (voluntary and evoked contractions) before and after R(WU) and S(WU) protocols.
  • Measurements included maximal voluntary contraction torque, muscle activation, and twitch characteristics.
  • Both warm-up protocols were approximately 40 minutes in duration and involved comparable mechanical work.

Main Results:

  • Both R(WU) and S(WU) significantly increased maximal voluntary contraction torque and muscle activation to a similar extent.
  • Both protocols led to a significant reduction in time to contract.
  • No significant changes were observed in other isometric twitch parameters.

Conclusions:

  • Running-based and strength-based warm-ups similarly enhance knee extensor force-generating capacity, primarily through improved muscle activation.
  • Both warm-up strategies exhibit comparable effects on M-wave and isometric twitch characteristics, suggesting similar neural and contractile adaptations.