Jean Sibonga

Bone physiologist who leads the Bone and Mineral Laboratory at NASA's Johnson Space Center, responsible for the agency's long-running program measuring astronaut skeletal loss and the effectiveness of in-flight countermeasures. She is the first author of the 2019 Bone study showing that in-flight resistive exercise on the Advanced Resistive Exercise Device protected cortical bone at the femoral neck but did not prevent hip trabecular loss (claim-sibonga-2019-ared-protects-cortical-not-trabecular-in-spaceflight).

Within this vault her 2019 study is Böcker et al. 2026's reference 23 and one of the two spaceflight-side pillars establishing the trabecular/cortical countermeasure asymmetry beneath the compartment dissociation (claim-bocker-refs-support-bedrest-cortical-spaceflight-trabecular-dissociation). She recurs across the vault's spaceflight bone-loss cluster as a co-author of the Spector/Smith/Sibonga primary studies the bed-rest-analog thread rests on (entity-jorn-rittweger's hub notes the earlier bed-rest notes drawing on that group).

References

• claim-sibonga-2019-ared-protects-cortical-not-trabecular-in-spaceflight · claim-bocker-refs-support-bedrest-cortical-spaceflight-trabecular-dissociation
• Captures: 2026-08-16-does-the-compartment-level-literature-böckers-refs-12