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Muscles that Move the Leg

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 Thigh

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 Toes

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.

Bones of the Lower Limb: Femur and Patella

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...

Work Done Over an Inclined Plane

Work Done Over an Inclined Plane

The center-of-mass framework helps to easily describe the work done on rigid bodies. Since the internal forces in a rigid body do no work, they can be ignored, and the external forces can be considered in the work-energy theorem.
The work done by gravity to move a rigid body, or the work done by an opposing force to move a rigid body against gravity, can be calculated using the center-of-mass framework. It is the line integral of the force of gravity over the path, considered positive if...

Knee Joint

Knee Joint

The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...

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Related Experiment Video

Updated: Jun 17, 2026

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

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

Published on: May 1, 2018

Quadriceps Muscle Function during Recreational Alpine Skiing.

Josef Kröll¹, James M Wakeling, John G Seifert

¹Department of Sport Science and Kinesiology, University of Salzburg, Austria. josef.kroell@sbg.ac.at

Medicine and Science in Sports and Exercise

|January 14, 2010

Summary

This summary is machine-generated.

Recreational skiers show varied quadriceps muscle activity. The rectus femoris (RF) is highly active on the inside leg, while vastus lateralis (VL) shows lower activity, challenging carving hypotheses.

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Area of Science:

Sports Science
Biomechanics
Human Physiology

Background:

Previous research on carving skis focused on expert skiers' muscle activity.
Understanding recreational skier biomechanics is crucial for injury prevention and performance enhancement.

Purpose of the Study:

To analyze functional differences within the quadriceps muscle during recreational skiing.
To investigate the topographical influence on muscle activity.
To apply time-frequency analysis to EMG intensities using wavelets.

Main Methods:

Seven female recreational skiers performed runs on slopes of varying inclinations (13°, 29°, 21°).
Knee angle and EMG of vastus lateralis (VL) and rectus femoris (RF) were measured.
EMG signals were analyzed using wavelets for time-frequency analysis, calculating EMG intensity and mean frequency (MF).

Main Results:

Rectus femoris (RF) showed higher mean frequency (MF) on the inside leg, with similar EMG intensities.
Vastus lateralis (VL) exhibited lower MF and EMG intensities on the inside leg.
Both muscles demonstrated increased EMG intensities with steeper slopes, while MF was not directly related to inclination.

Conclusions:

Results do not support the coloading hypothesis for VL in recreational carving.
The rectus femoris (RF) experiences significant functional demand on the inside leg during recreational skiing.
Situation-dependent loading/unloading of the RF is key to managing fatigue during skiing.