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Related Concept Videos

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
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Exercise Stress Test01:26

Exercise Stress Test

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
Infertility in Females01:28

Infertility in Females

Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
Endometriosis, a condition characterized by abnormal growth of endometrial...
Competition02:34

Competition

When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.Intraspecific competition, which occurs between individuals of the same species, serves as a natural mechanism for regulating population size. Too much...
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...
Inclusive Fitness00:57

Inclusive Fitness

Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.

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Related Experiment Video

Updated: Jun 16, 2026

Effects of a Novel Neuromuscular Training Intervention on Jump, Sprint, and Change of Direction in Adult Female Soccer Players
10:08

Effects of a Novel Neuromuscular Training Intervention on Jump, Sprint, and Change of Direction in Adult Female Soccer Players

Published on: June 10, 2025

The young female athlete.

Michal Hurvitz1, Ram Weiss

  • 1Hebrew University School of Medicine, Department of Human Metabolism and Nutrition, Braun School of Public Health and Community Medicine, Faculty of Medicine, Jerusalem, Israel.

Pediatric Endocrinology Reviews : PER
|February 2, 2010
PubMed
Summary

Strenuous sports can cause the athletic triad in young women, including amenorrhea, low bone density, and eating disorders. Early education on nutrition and training is key to prevention and good long-term health outcomes.

Area of Science:

  • Endocrinology
  • Sports Medicine
  • Adolescent Health

Background:

  • Strenuous sports participation in adolescents and young women can lead to significant metabolic and psychological issues.
  • Common manifestations include primary/secondary amenorrhea, reduced bone mineral density, and eating disorders, collectively termed the athletic triad.
  • Hormonal factors like reduced leptin and chronic stress responses contribute to these conditions.

Purpose of the Study:

  • To highlight the clinical relevance of the athletic triad and exercise-related female reproductive dysfunction (ERFRD) in athletes.
  • To discuss the hormonal underpinnings, such as leptin levels and stress responses.
  • To emphasize the importance of prevention and early intervention strategies.

Main Methods:

  • Review of clinical manifestations and underlying hormonal drivers in female athletes.

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An Investigation of the Effects of Sports-related Concussion in Youth Using Functional Magnetic Resonance Imaging and the Head Impact Telemetry System
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An Investigation of the Effects of Sports-related Concussion in Youth Using Functional Magnetic Resonance Imaging and the Head Impact Telemetry System

Published on: January 12, 2011

Related Experiment Videos

Last Updated: Jun 16, 2026

Effects of a Novel Neuromuscular Training Intervention on Jump, Sprint, and Change of Direction in Adult Female Soccer Players
10:08

Effects of a Novel Neuromuscular Training Intervention on Jump, Sprint, and Change of Direction in Adult Female Soccer Players

Published on: June 10, 2025

An Investigation of the Effects of Sports-related Concussion in Youth Using Functional Magnetic Resonance Imaging and the Head Impact Telemetry System
07:02

An Investigation of the Effects of Sports-related Concussion in Youth Using Functional Magnetic Resonance Imaging and the Head Impact Telemetry System

Published on: January 12, 2011

  • Discussion of functional hypothalamic amenorrhea as a manifestation of ERFRD.
  • Emphasis on educational strategies for athletes, trainers, parents, and healthcare professionals.
  • Main Results:

    • The athletic triad (amenorrhea, low bone density, eating disorders) is a recognized complex in female athletes.
    • ERFRD can lead to short-term infertility and long-term osteoporosis.
    • Functional hypothalamic amenorrhea results from excessive stress, exercise, and/or low intake, suppressing GNRH secretion.

    Conclusions:

    • Prevention through education on nutrition and safe training is paramount for female athletes.
    • While prognosis is generally good, long-term morbidity is a concern.
    • Addressing the athletic triad and ERFRD requires a multidisciplinary approach involving education and support.