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Related Concept Videos

Exercise Stress Test01:26

Exercise Stress Test

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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.
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Exercise and Cardiovascular Response01:20

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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
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The intricate hormonal interplay essential for male reproductive health begins with the release of gonadotropin-releasing hormone (GnRH) by the hypothalamus. This hormone prompts the pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). LH targets the Leydig cells in the testes, stimulating them to produce and release testosterone. In concert with testosterone, FSH acts on the Sertoli cells within the seminiferous tubules to facilitate the release of...
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Muscle Recovery and Fatigue01:24

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Exercise and Muscle Performance01:27

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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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COPD: Management Using Bronchodilators and Corticosteroids

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Chronic obstructive pulmonary isease (COPD) involves a group of progressive lung disorders characterized by persistent airflow limitation and chronic respiratory symptoms. Asthma-COPD Overlap Syndrome (ACOS), encompassing features of both asthma and Chronic obstructive pulmonary disease (COPD), is a group of progressive lung disorders that includes chronic bronchitis, emphysema, and refractory (non-reversible) asthma. ACOS leads to complex clinical presentations that combine the inflammatory...
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Related Experiment Video

Updated: Dec 13, 2025

Impact of High-intensity Interval Exercise and Moderate-Intensity Continuous Exercise on the Cardiac Troponin T Level at an Early Stage of Training
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Exercise and Testosterone Countermeasures to Mitigate Metabolic Changes during Bed Rest.

Meghan E Downs1, Jessica M Scott2, Lori L Ploutz-Snyder3

  • 1National Aeronautics and Space Administration, Houston, TX.

Life Sciences in Space Research
|July 29, 2020
PubMed
Summary

Exercise helps astronaut health, but inactivity causes metabolic issues. Low-dose testosterone combined with exercise may offer additional metabolic benefits during spaceflight analogs.

Keywords:
Energy BalanceGlucose ToleranceInsulin SensitivityMetabolic RateSpaceflight

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Conducting Maximal and Submaximal Endurance Exercise Testing to Measure Physiological and Biological Responses to Acute Exercise in Humans
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Area of Science:

  • Space physiology
  • Metabolic health
  • Countermeasure research

Background:

  • Long-duration spaceflight poses risks to astronaut metabolic health.
  • Exercise is a primary countermeasure, but its efficacy is limited.
  • Adverse metabolic changes can still occur despite exercise interventions.

Purpose of the Study:

  • To investigate metabolic changes during a 70-day head-down bed rest analog.
  • To assess the effectiveness of exercise alone versus exercise with testosterone supplementation.
  • To identify strategies for mitigating metabolic decline in simulated spaceflight.

Main Methods:

  • Healthy men (<55 years) underwent 70-day head-down bed rest.
  • Participants were randomized into Control, Exercise + Testosterone (TEX), or Exercise + Placebo (PEX) groups.
  • Metabolic parameters including basal metabolic rate, glucose tolerance, and insulin sensitivity were measured serially.

Main Results:

  • Bed rest decreased basal metabolic rate and negatively impacted glucose metabolism.
  • Leptin levels decreased during bed rest across all groups.
  • Testosterone supplementation (TEX) protected against insulin resistance induced by bed rest.

Conclusions:

  • Seventy days of head-down bed rest adversely affects metabolic health.
  • Exercise countermeasures are beneficial but not fully protective against metabolic decline.
  • Testosterone may offer supplementary benefits to exercise in preserving metabolic health during inactivity.