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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...
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...
Muscles that Move the Thigh01:20

Muscles that Move the Thigh

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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.
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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
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Excitation-Contraction Coupling in Skeletal Muscles01:20

Excitation-Contraction Coupling in Skeletal Muscles

Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action potential...

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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

Hamstring activation during lower body resistance training exercises.

William P Ebben1

  • 1Marquette University, Milwaukee, WI, USA.

International Journal of Sports Physiology and Performance
|May 7, 2009
PubMed
Summary
This summary is machine-generated.

Different resistance exercises activate hamstring and quadriceps muscles unequally. Women show lower hamstring-to-quadriceps activation ratios than men, suggesting a need for targeted hamstring training.

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Lower Limb Biomechanical Analysis of Healthy Participants
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Area of Science:

  • Exercise Physiology
  • Biomechanics
  • Sports Science

Background:

  • Understanding muscle activation patterns is crucial for optimizing resistance training programs.
  • Hamstring and quadriceps muscle activation varies significantly across different lower body exercises.
  • Gender-based differences in muscle activation may influence training adaptations and injury risk.

Purpose of the Study:

  • To compare hamstring and quadriceps muscle activation during six common resistance exercises.
  • To evaluate hamstring-to-quadriceps (H-to-Q) muscle activation ratios.
  • To investigate potential gender differences in H-to-Q ratios during resistance training.

Main Methods:

  • Utilized a randomized repeated measures design with 34 college athletes.
  • Measured biceps femoris (hamstring) and rectus femoris (quadriceps) electromyography (EMG) during squat, leg curl, deadlift variations, good morning, and Russian curl exercises.
  • Calculated H-to-Q EMG ratios for each exercise.

Main Results:

  • Significant main effects for hamstring (H) and quadriceps (Q) activation were observed across exercises (P < 0.001).
  • Significant main effects for the H-to-Q ratio were found across all subjects (P < 0.001).
  • Women exhibited lower H-to-Q ratios compared to men, ranging from 53.9% to 89.5% (unadjusted) and 35.9% to 76.0% (strength-matched).

Conclusions:

  • Resistance exercises elicit differential hamstring and quadriceps activation and H-to-Q ratios.
  • Women demonstrate reduced hamstring activation relative to quadriceps activation compared to men.
  • Women may benefit from more targeted hamstring training to achieve balanced muscle development.