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Related Concept Videos

Muscles that Move the Leg01:23

Muscles that Move the Leg

The movement of the legs is facilitated by numerous muscles located within the anterior, medial, and posterior compartments of the thigh.
Anterior Compartment
The quadriceps femoris, the most visible muscle of the anterior compartment, is integral for leg extension and thigh flexion. It is formed by merging four distinct muscles — the vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris. The quadriceps tendon, a shared tendon of the four quadriceps muscles, is affixed to...
Muscles that Move the Thigh01:20

Muscles that Move the Thigh

The thigh's motion is primarily governed by muscles originating in the pelvic girdle and inserted into the femur. One crucial muscle, the iliopsoas, is a combination of the psoas major and the iliacus muscles, sharing a common insertion point on the lesser trochanter of the femur.
Three other significant muscles are the gluteus maximus, gluteus medius, and gluteus minimus. The gluteus maximus originates from the posterior surface of the ilium, sacrum, and coccyx, and the thoracolumbar fascia...
Muscles of the Leg that Move the Foot and Toes01:28

Muscles of the Leg that Move the Foot and Toes

The human leg comprises an intricate system of muscles that facilitate the movement of feet and toes. Within this system, the muscles are categorized into the anterior, lateral, and posterior compartments, each with a unique set of muscles carrying out specific functions.
Anterior Compartment
The anterior compartment includes muscles that contribute to the dorsiflexion of the foot. This compartment houses the tibialis anterior, extensor hallucis longus, and extensor digitorum longus muscles.
Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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...
Relaxation of Skeletal Muscles01:29

Relaxation of Skeletal Muscles

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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Related Experiment Video

Updated: May 23, 2026

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
07:30

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations

Published on: May 1, 2018

A dynamic warm-up model increases quadriceps strength and hamstring flexibility.

Alain J Aguilar1, Lindsay J DiStefano, Cathleen N Brown

  • 1Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.

Journal of Strength and Conditioning Research
|March 27, 2012
PubMed
Summary
This summary is machine-generated.

Dynamic warm-up (DWU) enhances hamstring flexibility and eccentric quadriceps strength, unlike static stretching. This study suggests DWU is a superior pre-exercise warm-up for improving physical performance.

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Biomechanics

Background:

  • Static stretching may impair muscle strength and power, potentially decreasing functional performance.
  • Dynamic warm-up (DWU) is an alternative, but research on its effects is limited.
  • Understanding the acute effects of different warm-up protocols is crucial for optimizing athletic preparation.

Purpose of the Study:

  • To compare the acute effects of dynamic warm-up (DWU) and static stretching warm-up (SWU) on muscle flexibility, strength, and vertical jump.
  • To investigate the efficacy of DWU as a pre-activity warm-up strategy.
  • To provide evidence-based recommendations for warm-up protocols in sports.

Main Methods:

  • A randomized controlled trial design was employed with 45 volunteers assigned to control (CON), SWU, or DWU groups.
  • Participants underwent a 10-minute warm-up protocol after a 5-minute stationary bicycle ride.
  • Measurements included flexibility (inclinometer), peak torque (isokinetic dynamometer), and vertical jump (force plate).

Main Results:

  • The DWU group showed significant increases in hamstring flexibility and eccentric quadriceps peak torque.
  • No significant changes in flexibility, strength, or vertical jump were observed in the CON or SWU groups.
  • DWU improved eccentric quadriceps strength and hamstring flexibility, while SWU had no significant impact.

Conclusions:

  • Dynamic warm-up may be a more effective pre-activity warm-up strategy than static stretching.
  • DWU can enhance specific measures of muscle function and flexibility.
  • Further research is warranted to explore the long-term effects and broader applications of DWU.