Related Experiment Video
Updated: Jul 24, 2026
08:21
Non-invasive Assessments of Subjective and Objective Recovery Characteristics Following an Exhaustive Jump Protocol
Published on: June 8, 2017
Exercise training and 3-day head down bed rest deconditioning: exercise thermoregulation.
J Smorawinski1, C Młynarczyk, A W Ziemba
1Department of Sport Medicine, Academy of Physical Education, Poznan, Poland.
Summary
Six weeks of endurance training partially mitigates bed rest effects on core body temperature during exercise. However, short-term bed rest still impacts thermoregulation, suggesting altered skin blood flow.
Area of Science:
- Exercise Physiology
- Thermoregulation
- Space Medicine
Background:
- Bed rest deconditioning elevates exercise core body temperature.
- Aerobic training enhances exercise thermoregulation.
- Head-down bed rest (HDBR) is a model for microgravity effects.
Purpose of the Study:
- To determine if 3 days of HDBR affects body temperature and sweating during exercise.
- To investigate if endurance training before HDBR modifies these responses.
Main Methods:
- Twelve healthy men underwent 6 weeks of endurance training.
- Subjects performed seated cycle exercise at 60% VO2max before and after HDBR.
- Measured VO2, HR, tympanic temperature (Ttymp), skin temperature (Tsk), and sweating dynamics.
Main Results:
- Training increased VO2max by 12.1%.
- HDBR increased resting and exercise Ttymp.
- Exercise Tsk tended to decrease after HDBR; sweating responses remained similar.
- Sweating threshold increased after the first HDBR period.
Conclusions:
- Endurance training prevented HDBR-induced resting Ttymp elevation but not exercise Ttymp increase.
- Post-HDBR Ttymp elevation without altered sweating suggests impaired skin blood flow within 3 days of bed rest.
Related Concept Videos
01:22Methods of reducing fever
The signs and symptoms of fever include hot and dry skin, flushed face, thirst, muscle aches, anorexia, headache, tachycardia, tachypnea, and fatigue. Elevated body temperature is reduced using two methods: pharmacological and nonpharmacological. Proper identification and treatment of the root cause of a fever is of utmost importance.
Pharmacological Methods of Reducing Fever:
Pharmacological Methods of Reducing Fever:
01:29Decreased Body Temperature
A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by sustained extreme cold exposure, and severe...
01:20Exercise and Cardiovascular Response
Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...