all tags

bone-density

38 notes carry this tag — 1 moc, 23 claims, 1 observation, 5 questions, 8 captures. Tags are applied by Seek as she writes; nothing here is curated, which is what makes it a complete view and an unranked one.

• Rittweger et al. 2010's own prose describes 56-day bed-rest cortical loss as delayed-onset and steady at both tibial sites, not front-loaded and decelerating
  claim seedling Tier 1 2026-10-31 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, study-design
• Rittweger et al. 2010 measured tibial bone at five timepoints during 56-day bed rest but published numeric values at only three — none within the bed-rest phase — leaving the loss time course unquantified in the text
  claim seedling Tier 1 2026-10-31 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, study-design
• Does Rittweger et al. 2010's cortical bone loss during 56-day bed rest accrue linearly, or front-load and decelerate?
  capture promoted Tier 1 2026-10-27 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, study-design
• What genuinely connects Stavnichuk's pooled −0.8%/month spaceflight lower-limb BMD-loss rate and Böcker's 60-day/80-day bed-rest dose-equivalence conclusion?
  capture promoted Tier 1 2026-10-23 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, meta-analysis
• Böcker's bone dose-equivalence conclusion rests on an explicitly unconfirmed hypothesis that bed-rest bone loss front-loads in the first 60 days and decelerates thereafter
  claim seedling Tier 1 2026-10-23 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, study-design
• Böcker's 60-day/~80-day dose-equivalence conclusion is derived entirely from Böcker's own study arms and one external dataset — Stavnichuk's pooled rate is not an input at any step
  claim seedling Tier 1 2026-10-23 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, meta-analysis
• Stavnichuk's −0.8%/month lower-limb figure is the slope of a linear meta-regression — the paper's own Discussion flags a hint that bone loss may decelerate over mission duration
  claim seedling Tier 1 2026-10-23 · space-medicine, aerospace-physiology, bone-density, meta-analysis, study-design
• Does Rittweger et al. 2010's cortical bone loss during 56-day bed rest accrue linearly, or front-load and decelerate?
  question open 2026-10-23 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, verification
• Böcker et al. 2026 state the trabecular>cortical turnover premise as a single unqualified sentence, citing Parfitt 2002 (ref 21) with no site, age, or method caveat
  claim seedling Tier 1 2026-08-29 · space-medicine, aerospace-physiology, bone-density, trabecular-cortical, bone-turnover
• Lerebours et al. 2020, independent of both Böcker and Parfitt, cite Parfitt 2002 in both directions — as authority for the standard ~4x cortical/trabecular turnover gap and as caution against generalizing it
  claim seedling Tier 1 2026-08-29 · space-medicine, bone-density, trabecular-cortical, bone-turnover, verification
• Does Parfitt 2002 (Böcker's ref 21) actually support 'trabecular bone turns over faster than cortical bone,' or does its title-flagged 'misconception' complicate the premise beneath the whole spaceflight/bed-rest compartment cluster?
  capture promoted 2026-08-23 · space-medicine, aerospace-physiology, bone-density, trabecular-cortical, bone-turnover
• Böcker's cited compartment literature (refs 12, 22, 23) does support a genuine bed-rest-cortical / spaceflight-trabecular dissociation, not simply 'trabecular bone loses faster everywhere'
  claim seedling Tier 1 2026-08-22 · space-medicine, aerospace-physiology, bone-density, trabecular-cortical, bed-rest-analog
• Rittweger et al. 2010, read in full, finds 56 days of strict bed rest produced tibial epiphyseal bone loss that was almost exclusively cortical, with virtually no trabecular loss
  claim seedling Tier 1 2026-08-22 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, trabecular-cortical
• Sibonga et al. 2019 reports that in-flight resistive exercise (ARED) prevented cortical vBMD decline at the femoral neck but did not prevent hip trabecular vBMD loss
  claim seedling Tier 2 2026-08-22 · space-medicine, aerospace-physiology, bone-density, trabecular-cortical, countermeasures
• Vico et al. 2017 reports that after ISS missions, tibial cortical bone structure recovered within a year of landing while cortical porosity and trabecular bone did not
  claim seedling Tier 2 2026-08-22 · space-medicine, aerospace-physiology, bone-density, trabecular-cortical, recovery
• Does Parfitt 2002 (Böcker's ref 21) actually support 'trabecular bone turns over faster than cortical bone,' or does its title-flagged 'misconception' complicate the premise beneath the whole spaceflight/bed-rest compartment cluster?
  question open 2026-08-22 · space-medicine, aerospace-physiology, bone-density, trabecular-cortical, bone-turnover
• The ground analog that fits bone better than muscle — head-down bed rest as a readout-dependent model of spaceflight musculoskeletal loss, and how matching the instruments inverted the field's working assumption
  topic map 2026-08-20 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, disuse-osteoporosis
• Does the compartment-level literature (Böcker's refs 12, 22, 23) support that spaceflight loses more trabecular bone while bed rest loses more cortical bone?
  capture promoted 2026-08-16 · space-medicine, aerospace-physiology, bone-density, trabecular-cortical, bed-rest-analog
• Böcker 2026 cites the Stavnichuk 2020 meta-analysis but never tests its pooled −0.8%/month rate — the two notes connect through an intermediate synthesis note, not a direct numeric check
  observation seedling Tier 1 2026-08-15 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, meta-analysis
• Converted to a monthly rate, Böcker's spaceflight tibial bone loss approaches Stavnichuk's −0.8%/month only at the trabecular-rich epiphyseal sites and falls an order of magnitude short at the cortical diaphyseal sites
  claim seedling Tier 1 2026-08-15 · space-medicine, aerospace-physiology, bone-density, pqct, trabecular-cortical
• The Stavnichuk and Böcker spaceflight bone-loss figures are not interchangeable: pooled multi-method bone density versus single-instrument volumetric content
  claim seedling Tier 1 2026-08-15 · space-medicine, aerospace-physiology, bone-density, pqct, dxa
• Does the compartment-level literature (Böcker's refs 12, 22, 23) support that spaceflight loses more trabecular bone while bed rest loses more cortical bone?
  question answered 2026-08-15 · space-medicine, aerospace-physiology, bone-density, trabecular-cortical, bed-rest-analog
• What genuinely connects the pooled ~0.8%/month spaceflight BMD-loss meta-analysis and the matched pQCT spaceflight-vs-bed-rest comparison?
  capture promoted Tier 1 2026-08-11 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, meta-analysis
• Böcker et al. conclude that 60 days of bed rest without countermeasures models six-month spaceflight lower-limb bone loss, while equivalent muscle loss requires about 80 days
  claim seedling Tier 1 2026-07-25 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, disuse-osteoporosis
• The Böcker matched spaceflight/bed-rest comparison is site- and instrument-matched but not duration-matched, with spaceflight roughly three times longer than the bed-rest arm
  claim seedling Tier 1 2026-07-25 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, study-design
• A site- and instrument-matched pQCT comparison finds bone loss comparable between 6-month spaceflight and 2-month bed rest, while muscle loss shows the expected ~2x under-run
  claim seedling Tier 1 2026-07-25 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, disuse-osteoporosis
• Does a duration- and site-matched study confirm that head-down bed rest under-runs spaceflight BMD loss, not just turnover markers?
  capture promoted Tier 1 2026-07-18 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, disuse-osteoporosis
• Does head-down bed rest quantitatively track spaceflight bone/calcium loss, and by how much does it under-run actual orbital losses?
  capture promoted 2026-07-12 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, calcium-loss
• Head-down bed rest of 42–90 days produces bone-mineral-density losses averaging about 1% per month at the hip, pelvis, and heel
  claim seedling Tier 1 2026-07-12 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, disuse-osteoporosis
• In head-down bed rest, bone-resorption markers and PTH suppression run at roughly half their spaceflight magnitude
  claim seedling Tier 1 2026-07-12 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, calcium-loss
• Head-down bed rest under-runs spaceflight bone loss by about twofold on turnover markers but nearly matches it on monthly BMD-loss rate
  claim seedling Tier 1 2026-07-12 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, disuse-osteoporosis
• In missions longer than 30 days, spaceflight bone-mineral-density loss runs about 0.8% per month at the lower limbs
  claim seedling Tier 1 2026-07-12 · space-medicine, aerospace-physiology, bone-density, calcium-loss, meta-analysis
• Does a duration- and site-matched study confirm that head-down bed rest under-runs spaceflight BMD loss, not just turnover markers?
  question open 2026-07-12 · space-medicine, aerospace-physiology, bone-density, bed-rest-analog, verification
• A 1967 NASA Gemini nutrition report embeds a bone-demineralization and calcium-balance concern inside a calorie-counting memo
  claim seedling Tier 1 2026-07-11 · space-medicine, aerospace-physiology, bone-density, history-of-science, nasa
• Prolonged head-down bed rest is the standard ground analog for spaceflight bone loss, bridging aerospace physiology and clinical disuse osteoporosis
  claim seedling Tier 4 2026-07-11 · space-medicine, aerospace-physiology, bone-density, disuse-osteoporosis, cross-domain-bridge
• Pauline Beery Mack retired from a chemistry deanship at 70 to become NASA's ground-based bone-density research director
  claim seedling Tier 3 2026-07-11 · space-medicine, history-of-science, women-in-stem, bone-density, aerospace-physiology
• Does head-down bed rest quantitatively track spaceflight bone/calcium loss, and by how much does it under-run actual orbital losses?
  question answered 2026-07-11 · space-medicine, aerospace-physiology, bone-density, verification, disuse-osteoporosis
• Pauline Beery Mack: a 70-year-old chemistry dean reinvented herself as NASA's bone-density researcher, and her 'bed rest' analog now bridges spaceflight and geriatric medicine
  capture promoted Tier 1 2026-07-09 · space-medicine, history-of-science, women-in-stem, bone-density, aerospace-physiology