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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 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.
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...
Bones of the Lower Limb: Femur and Patella01:16

Bones of the Lower Limb: Femur and Patella

The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the neck...
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...

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Related Experiment Video

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

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Published on: May 1, 2018

Muscle dynamics differences between legs in healthy adults.

Eamonn P Flanagan1, Andrew J Harrison

  • 1Biomechanics Research Unit, College of Science, University of Limerick, Ireland.

Journal of Strength and Conditioning Research
|February 23, 2007
PubMed
Summary

Explosive exercise reveals differences in leg muscle dynamics. The nonpreferred leg shows stiffer mechanics in rebound jumps, while the preferred leg excels in single drop jumps, highlighting task-specific adaptations.

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Sports Science

Background:

  • Muscle dynamics vary between preferred and nonpreferred legs during explosive exercise.
  • Understanding these differences is crucial for optimizing training and performance.

Purpose of the Study:

  • To examine differences in muscle dynamics between preferred and nonpreferred jumping legs during maximal, explosive exercise.
  • To compare leg performance in single-legged drop jumps versus cyclical rebound jumps.

Main Methods:

  • Eight subjects performed nonfatiguing single-legged drop jumps and rebound jumps.
  • Measures included flight time, reactive strength index, peak vertical force, and vertical leg-spring stiffness.
  • Data were collected for both preferred and nonpreferred legs using a force sledge apparatus.

Main Results:

  • Subjects used a stiffer leg spring and more explosive action in the nonpreferred leg during rebound jumps compared to drop jumps.
  • The preferred leg performed similarly in both jump types.
  • Drop jumps showed greater flight time and reactive strength index in the preferred leg, unlike rebound jumps.

Conclusions:

  • Rebound jump protocols may reflect symmetrical running mechanics, while drop jumps reveal asymmetries due to preferred leg selection.
  • Leg-spring stiffness is modulated based on task demands.
  • Strength and conditioning coaches should carefully select jump protocols and interpret data cautiously.