# Exercise Prepares Astronaut Hearts for Mars

> NASA study shows six-month space missions don't harm hearts enough to risk Mars landings with current exercise routines
- Title: Exercise Prepares Astronaut Hearts for Mars · Dallas Express
- Summary: NASA study shows six-month space missions don't harm hearts enough to risk Mars landings with current exercise routines Astronauts' hearts stay functional…
- Keywords: nasa, ut southwestern, international space station, mars mission, cardiac health, exercise countermeasures, orthostatic intolerance, pots, cardiac atrophy, spaceflight, news, politics
- Source: Dallas Express — https://dallasexpress.com/city/dallas-study-exercise-may-keep-astronaut-hearts-ready-for-mars
- Author: Dallas Express
- Published: 2026-09-24T12:00:08+00:00
- Read time: 1 min
- Topics: nasa, ut southwestern, international space station, mars mission, cardiac health, exercise countermeasures, orthostatic intolerance, pots, cardiac atrophy, spaceflight, news, politics
## Heart Changes in Space
Astronauts' hearts shrink early in spaceflight but return to normal with exercise
## Six-Month Mission Study
Researchers tracked 14 astronauts for 164 days on the International Space Station
## Mars Gravity Simulation
Scans measured hearts at 22-degree tilt to simulate Mars' 0.38 gravity environment
## Early Cardiac Shifts
Hearts became smaller and pumped less blood early in mission due to motion sickness
## Exercise Countermeasures
Astronauts did 45-60 minutes daily of strength and endurance exercises
## Heart Recovery Pattern
Cardiac measurements returned to preflight levels by mission end with exercise
## Mars Landing Readiness
Astronauts showed no greater heart stress in Mars gravity than on Earth before flight
## Real Mars Risks
Actual Mars missions face radiation, isolation, and longer durations than ISS missions
## Earth Health Applications
Findings help treat patients with orthostatic intolerance and POTS conditions
## Future Mars Research
NASA plans yearlong Moon and Mars analog missions starting August 2027
## Key takeaway

Astronauts' hearts stay functional for Mars gravity with existing exercise protocols during six-month missions