Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Muscles that Move the Leg01:23

Muscles that Move the Leg

5.3K
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...
5.3K
Poisson's Ratio01:23

Poisson's Ratio

1.2K
Poisson's ratio is a material property that indicates their stress response. It explains the connection between the elongation or compression a material undergoes in the direction of an applied force and the contraction or expansion it experiences perpendicular to that force. When a slender bar is loaded axially, it stretches in the direction of the force and contracts laterally. Poisson's ratio is the negative ratio of this lateral contraction to the axial elongation. The negative sign...
1.2K
Odds Ratio01:09

Odds Ratio

1.9K
The odds ratio (OR) is a statistical measure used extensively in epidemiology and research to quantify the strength of association between exposure and outcome across different groups. Unlike relative risk, which compares the probabilities of an event occurring, the odds ratio compares the odds of an event occurring in the exposed group to the odds of it occurring in the unexposed group. The odds, in this context, are calculated as the probability of the event happening divided by the...
1.9K
Hazard Ratio01:12

Hazard Ratio

613
The hazard ratio (HR) is a widely used measure in clinical trials to compare the risk of events, such as death or disease recurrence, between two groups over time. It reflects the ratio of hazard rates—the instantaneous risk of the event occurring—between a treatment group and a control group. This measure provides valuable insights into the relative effectiveness of a treatment by assessing how the risk of an event differs between the two groups.
For example, in a clinical trial...
613
Exercise Stress Test01:26

Exercise Stress Test

1.4K
Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
1.4K
Reducing Line Loss01:18

Reducing Line Loss

390
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
390

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Lateral dominance and (as)symmetry in 50 m all-out front crawl.

Anais da Academia Brasileira de Ciencias·2026
Same author

Optimising exercise prescription for cancer-related fatigue, lean mass, physical function and muscle strength in women with breast cancer: a systematic review with dose-response network meta-analysis.

British journal of sports medicine·2026
Same author

A systematic review and meta-analysis on the benefits of resistance exercise in patients with fibromyalgia.

Journal of bodywork and movement therapies·2026
Same authorSame journal

Unlocking mobility: A kinetic perspective on the 30-second chair stand test in older adults.

Journal of bodywork and movement therapies·2026
Same author

Do Combined Resistance and Aerobic Exercise Programs Cause an Interference Effect in Women with Breast Cancer? A Systematic Review and Network Meta-analysis.

Sports medicine (Auckland, N.Z.)·2026
Same author

Is lower limb muscle power by vertical jump a sensitive and specific measure for screening sarcopenia compared to handgrip strength and chair stand test?

Brazilian journal of physical therapy·2026

Related Experiment Video

Updated: Feb 6, 2026

Author Spotlight: Assessing the Reliability of Doppler Ultrasound in Measuring Leg Blood Flow
09:18

Author Spotlight: Assessing the Reliability of Doppler Ultrasound in Measuring Leg Blood Flow

Published on: December 15, 2023

3.5K

Leg press exercise can reduce functional hamstring:quadriceps ratio in the elderly.

Lucas Bet da Rosa Orssatto1, Bruno Monteiro de Moura1, Raphael Luiz Sakugawa1

  • 1Laboratório de Biomecânica, Universidade Federal de Santa Catarina, Florianópolis, Brazil.

Journal of Bodywork and Movement Therapies
|August 14, 2018
PubMed
Summary
This summary is machine-generated.

Twelve weeks of leg press strength training in the elderly did not improve conventional hamstring:quadriceps ratios. However, it significantly reduced the functional ratio, indicating potential risks for this population.

Keywords:
AgingConventional ratioFunctional ratioIsokinetic testingKnee joint stabilityResistance training

More Related Videos

Evaluating the Function of the Foot Core System in the Elderly
08:25

Evaluating the Function of the Foot Core System in the Elderly

Published on: March 11, 2022

3.3K
Muscle Function Obtained with Motion Mode Ultrasound and Surface Electromyography during Core Endurance Exercise
09:21

Muscle Function Obtained with Motion Mode Ultrasound and Surface Electromyography during Core Endurance Exercise

Published on: August 25, 2022

3.8K

Related Experiment Videos

Last Updated: Feb 6, 2026

Author Spotlight: Assessing the Reliability of Doppler Ultrasound in Measuring Leg Blood Flow
09:18

Author Spotlight: Assessing the Reliability of Doppler Ultrasound in Measuring Leg Blood Flow

Published on: December 15, 2023

3.5K
Evaluating the Function of the Foot Core System in the Elderly
08:25

Evaluating the Function of the Foot Core System in the Elderly

Published on: March 11, 2022

3.3K
Muscle Function Obtained with Motion Mode Ultrasound and Surface Electromyography during Core Endurance Exercise
09:21

Muscle Function Obtained with Motion Mode Ultrasound and Surface Electromyography during Core Endurance Exercise

Published on: August 25, 2022

3.8K

Area of Science:

  • Gerontology
  • Exercise Physiology
  • Biomechanics

Background:

  • Muscle strength and balance decline with age, increasing fall risk in the elderly.
  • Maintaining adequate hamstring and quadriceps strength ratios is crucial for functional mobility and injury prevention.

Purpose of the Study:

  • To investigate the effects of 12 weeks of 45° leg press strength training on hamstring:quadriceps ratios in elderly individuals.
  • To determine if leg press exercise alone can improve or maintain these critical strength ratios.

Main Methods:

  • Twelve elderly participants underwent a 12-week progressive 45° leg press training program (2 sessions/week).
  • Measurements included one repetition maximum (1RM), concentric and eccentric knee flexor peak torques, and concentric knee extensor peak torque.
  • Conventional and functional hamstring:quadriceps ratios were calculated and analyzed pre- and post-training.

Main Results:

  • Significant increases in 1RM and concentric knee extensor peak torque were observed.
  • No significant changes were found in knee flexor peak torques or the conventional hamstring:quadriceps ratio.
  • A significant reduction in the functional hamstring:quadriceps ratio was observed after 8 and 12 weeks of training.

Conclusions:

  • Isolated 45° leg press training in the elderly improves quadriceps strength but not hamstring strength.
  • The reduction in the functional ratio suggests an increased risk of injury.
  • 45° leg press exercise alone is not recommended for the elderly; it should be combined with specific hamstring exercises.