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These tools illustrate published standards and research. They are simplified, unvalidated and not reviewed. Do not use them to diagnose, treat, clear anyone to fly, or plan real operations. All calculations run in your browser; nothing you enter is stored or sent.
Post-flight Recovery Timeline
Also: astronaut recovery after landing · post-flight follow-up schedule
Gravity FieldsCardiovascularVestibular & SensorimotorMusculoskeletalNeuro-ophthalmicPostflight RecoveryLifetime SurveillanceLEO short-durationLEO long-durationClinicianPublicOperator / Spaceflight participantAstronaut & candidate
- Most astronauts return to normal activities within about 45 days of landing, after a daily reconditioning program that starts the day after landing [1][2]. ◆◆◆◇ Moderate · F E
- Orthostatic tolerance comes back within days (13 of 15 station astronauts passed a tilt test by R+3) [3]; walking returns to ~95% by about 15 days [4] and aerobic capacity by R+30 [5]. ◆◆◆◇ Moderate · F
- Bone and eye changes can outlast the mission by years: tibia strength was still below preflight at 1 year [6], and globe flattening has persisted beyond 7 years in some crew [7]. ◆◆◆◇ Moderate · F
- Use it to plan follow-up dates, not to judge an individual's recovery.
Proposed certainty (◆ High → ◇ Very low) and evidence-type tags: F flight · A analog · M model/animal · C computational · E expert/operational/standards. AI-proposed, pending reviewer confirmation. How to read the grades.
Timeline · post-flight recovery
Typical patterns from NASA crews · individuals varyRecovery horizon by body system (log scale, days after landing)
Tilt-test tolerance (most crew) [3]~3 d
Walking & balance (95%) [4]~15 d
Peak aerobic fitness [5]~30 d
Normal activities (most crew) [1]~45 d
Bone strength & density [6]> 365 d
Eye shape (some crew) [7]> 7 yr
Arrow-ended bars: not fully recovered at the last measurement. The orange line marks today.
Milestones
- R+0Whole body
Landing day (R+0): medical checks right away. Help with walking and moving is often needed because of muscle weakness and balance problems. [1] - R+0Heart & circulation
In a NASA study, only 2 of 6 long-duration (space station) astronauts could finish a 10-minute head-up tilt test on landing day. [3] - R+0Heart & circulation
In the same study, 52 of 65 Space Shuttle astronauts (short missions) finished the 10-minute tilt test on landing day. [3] - R+1–45Reconditioning
Supervised reconditioning starts the day after landing: 2 hours a day, 7 days a week, for 45 days. More time can be requested. [2] - R+1–3Eyes
Eye work-up 1–3 days after landing: vision, refraction, visual fields, retinal photos, optical coherence tomography (OCT), eye pressure, eye ultrasound and MRI of the brain and orbits. [7] - R+1–7Safety
First week: astronauts are usually advised not to drive or do physically demanding tasks. [1] - R+3Heart & circulation
3 days after landing, 13 of 15 space station astronauts finished the tilt test. Recovery was slower than after Shuttle flights. [3] - R+3Heart & circulation
3 days after landing, 19 of 19 Shuttle astronauts finished the tilt test. [3] - R+7Fitness
Post-flight fitness assessment (R+7). [2] - R+15Balance & walking
Obstacle-course walking typically back to 95% of preflight performance at about 15 days (space station crews, average flight 185 days). [4] - R+30Fitness
Peak aerobic capacity, lower on R+1 and R+10, had recovered by R+30 in space station astronauts. Second fitness assessment (R+30). [5][2] - R+30Bone
First post-flight bone density scan (DXA) within 30 days of landing in NASA's example 180-day schedule. [2] - R+45Whole body
Most astronauts return to normal activities within about 45 days. Longer missions may need more time. [1] - R+182Bone
Bone density scans at 6 months, 1 year, 2 years and 3 years, or until back within the scanner's least significant change from preflight. [2] - R+365Bone
At 12 months, tibia bone strength and density were still 0.9–2.1% below preflight (median); 9 of 17 astronauts had not fully recovered. Missions over 6 months recovered less. [6] - R+730Bone
Bone density scan, 2 years. [2] - R+1095Bone
Bone density scan, 3 years. [2] - R+2557Eyes
Flattening of the back of the eye has been seen on MRI more than 7 years after flight in some crewmembers. [7] - LifelongLifelong
Lifelong follow-up: NASA-STD-3001 requires crew to be monitored over time for health and well-being [V1 3018]. [8]
“R+N” means N days after landing (return). Most measurements come from NASA astronauts after space station or Shuttle missions; commercial flyers may differ. Nothing you enter leaves your browser.
How to use it
Enter the landing date and choose the mission length. The tool turns each published milestone into a calendar date and shows where today falls. “R+N” means N days after landing.
Where the milestones come from
| Area | Milestone | Source |
|---|---|---|
| Landing day | Medical checks; help with walking often needed | [1] |
| Heart and circulation | Tilt test finished on landing day by 2 of the 6 station astronauts tested (20 enrolled) vs 52 of 65 Shuttle astronauts; by R+3, 13 of 15 and 19 of 19 | [3] |
| Safety | No driving or demanding tasks in the first week | [1] |
| Reconditioning | 2 hours a day, 7 days a week, from R+1 for 45 days | [2] |
| Balance and walking | About 95% of preflight by ~15 days after ~6-month missions | [4] |
| Fitness | Peak aerobic capacity recovered by R+30 | [5] |
| Whole body | Most return to normal activities within about 45 days | [1] |
| Bone | Scans at R+30 or less, 6 months, 1, 2 and 3 years; tibia still 0.9–2.1% below preflight at 1 year | [2][6] |
| Eyes (SANS) | Full eye work-up 1–3 days after landing, including optical coherence tomography (OCT) and MRI; globe flattening can persist more than 7 years | [7] |
| Lifelong | Longitudinal monitoring required [V1 3018] | [8] |
What to do with it
- Function returns in weeks; structure can take years. Plan bone density (DXA) and eye follow-up beyond the first month [2][7].
- Compare with the person’s own preflight results. Post-flight testing is judged against preflight levels [2].
- Red flags in recovery: fainting with injury, chest pain, new headache with visual change, flank pain or blood in urine, one-sided limb swelling, persistent low mood. See Postflight recovery & surveillance.
Limits of this tool
- Data come from small groups of NASA astronauts, mostly after space station or Shuttle flights. Individuals vary widely.
- Commercial flyers may differ and usually return to their own clinicians. SMF found no published recovery data for suborbital flyers comparable with the NASA data used here, so the timeline should not be applied to them.
Evidence profile
- Overall certainty
- ◆◆◆◇ Moderate (proposed)
- Evidence types
- F · Flight dataE · Expert / operational / standards
- Literature through
- 2026-10-14
- Validation
- Formulas checked against the cited sources; tool output not clinically validated
- Credit
- Educational only; no CME or other credit
Requirements referenced 3
| Requirement | Title | Plain-language meaning |
|---|---|---|
| [V1 3017] | Post-Mission Reconditioning | Programs provide an individualized, phased reconditioning program starting at landing. |
| [V1 3018] | Post-Mission Long-Term Monitoring | Returning crew are monitored over time for health and well-being. |
| [V1 4028] | Post-Mission Bone Reconditioning | Reconditioning aims to return bone density to preflight values. |
IDs as published in NASA-STD-3001 Vol. 1 Rev C (2023-09-15) and NASA-STD-3001 Vol. 2 Rev F (2026-07-14). NASA-STD-3001 binds NASA programs; it is not a regulation for commercial flights. Paraphrased. Standards quick reference.
References 8
- NASA OCHMO. Crew Medical Support for Entry, Descent, and Landing. Technical Brief OCHMO-TB-051 (2026). www.nasa.gov/wp-content/uploads/2026/05/ochmo-tb-051-crew-me… NASA E
- NASA OCHMO. Bone Loss. Medical Technical Brief OCHMO-MTB-013, Revision D (2026). www.nasa.gov/wp-content/uploads/2026/02/ochmo-mtb-013-bone-l… NASA E
- Lee SMC, Feiveson AH, Stein S, Stenger MB, Platts SH. Orthostatic intolerance after ISS and Space Shuttle missions. Aerosp Med Hum Perform. 2015;86(12 Suppl):A54–A67. doi:10.3357/AMHP.EC08.2015 PMID:26630196 Peer-reviewed F
- Mulavara AP, Feiveson AH, Fiedler J, et al. Locomotor function after long-duration space flight: effects and motor learning during recovery. Exp Brain Res. 2010;202(3):649–659. doi:10.1007/s00221-010-2171-0 PMID:20135100 Peer-reviewed F
- Moore AD Jr, Downs ME, Lee SMC, Feiveson AH, Knudsen P, Ploutz-Snyder L. Peak exercise oxygen uptake during and following long-duration spaceflight. J Appl Physiol. 2014;117(3):231–238. doi:10.1152/japplphysiol.01251.2013 PMID:24970852 Peer-reviewed F
- Gabel L, Liphardt AM, Hulme PA, et al. Incomplete recovery of bone strength and trabecular microarchitecture at the distal tibia 1 year after return from long duration spaceflight. Sci Rep. 2022;12:9446. doi:10.1038/s41598-022-13461-1 PMID:35773442 Peer-reviewed F
- NASA OCHMO. Spaceflight Associated Neuro-ocular Syndrome (SANS). Medical Technical Brief OCHMO-MTB-001 (2024). www.nasa.gov/wp-content/uploads/2024/02/ochmo-mtb-001-sans.p… NASA E
- NASA OCHMO. NASA-STD-3001, Volume 1: Crew Health, Revision C (2023). [V1 3004], [V1 3017], [V1 3018], [V1 4030]–[V1 4033] and Table 4.8-1. www.nasa.gov/wp-content/uploads/2023/11/nasa-std-3001-vol-1-… Standard E
Machine-checked on 2026-10-14: each URL was fetched, each DOI's title and year matched via Crossref, PubMed IDs matched to DOIs, and every number used in a calculation was checked against the source text (abstract, NASA document, regulation or official web page). Human verification against full text is still required before review.
Article info
- Authors
- Pending (AI-assisted draft)
- Reviewer
- Pending review
- Last reviewed
- Pending review
- Literature through
- 2026-10-14
- AI-assisted
- Yes (disclosed)
- COI
- Pending
- License
- CC BY-SA 4.0 (text); code MIT
- Privacy
- Runs entirely in your browser; no inputs stored or sent
- Use
- Educational only · not for clinical decisions · Disclaimer
- Cite this version
- Pending first edition
Educational use only · not medical advice · not for clinical decisions · Disclaimer · CC BY-SA 4.0