Adjusting to Microgravity in Space

• Initial Challenges:
  • Group Captain Shubhanshu Shukla shared that he didn’t feel his usual self initially on the ISS.
  • It took a few days to adapt to microgravity.
  • He hopes not to experience similar symptoms upon return to Earth, though acknowledges the possibility of discomfort both ways.

Post-Splashdown Recovery

• Immediate Medical Checks:
  • After splashdown, astronauts are removed from the spacecraft by a SpaceX recovery team.
• First medical checks are done aboard the recovery vehicle.
• Return Logistics:
  • Astronauts are transported via helicopter to land from the recovery ship.

Reconditioning Process on Earth

• Health Monitoring:
  • Key health parameters recorded pre-flight are compared post-flight.
• Personalized Plans:
  • Recovery includes improving:
  • Mobility, balance, flexibility
  • Aerobic capacity, strength, endurance
  • Proprioception (body’s sense of position and movement)

Effects of Microgravity on the Brain

• Space Sickness:
  • Caused by sensory mismatch from the inner ear and gravity changes.
• Post-Return Challenges:
  • Brain adapts to ignore inner ear signals in space, causing balance issues back on Earth.

Why Splashdown is Preferred

• Safety and Simplicity:
  • Spacecraft re-enter atmosphere at ~27,000 km/h; deceleration on land is harder and riskier.
  • Water offers cushioning due to high density and low viscosity, reducing impact shock.
• Design Compatibility:
  • Capsules float; conical shape aids stability on water.
• Open Space Advantage:
  • Oceans provide flexibility; reduced collision risks from off-course landings.
• Controlled Deceleration:
  • Drogue (drag) parachutes deployed at ~18,000 feet stabilize and slow spacecraft before landing.