Liu et al. (2025) — Whole-Body Periodic Acceleration: A New Countermeasure Against Bone Loss Induced by Long-Term Hindlimb Unloading

By Vibrahealth Team · Last updated 22 July 2026

Study Details

Study: Whole-body periodic acceleration: a new countermeasure against bone loss induced by long-term hindlimb unloading

Authors: Liu X, Li J, Wang H, Wu F, Wang H, Jiang K, Yuan M, Xu Z, Kan G, Liu S, Dai X, Li W, Wang B, Li Z

Journal: European Journal of Applied Physiology

Year: 2025 (published online December 2025; print issue May 2026)

DOI: 10.1007/s00421-025-06110-8

Study type: Controlled animal study (Sprague Dawley rats)

Population: 48 male Sprague Dawley rats, randomised into 4 groups of 12: control, hindlimb unloading (HU), HU + WBPA, and HU + flat rest.

Plain-English Summary

Hindlimb unloading is a standard laboratory model for simulating the bone and muscle loss that occurs during prolonged immobilisation, bed rest, or spaceflight — conditions where the skeleton no longer bears normal load. This 2025 study examined whether whole-body periodic acceleration (WBPA), applied 1 hour per day, could counteract the bone loss caused by 28 days of hindlimb unloading in rats.

What Researchers Examined

• Bone mineral density (BMD) of femoral cancellous (spongy) bone via Micro-CT
• Bone volume to tissue volume ratio (BV/TV) and trabecular thickness (Tb.Th)
• Cortical area (Ct.Ar) of femoral cortical bone
• Mechanical bone strength via three-point bending test (maximum load, elastic load, energy absorption)

Key Findings

28 days of hindlimb unloading alone caused significant decreases in BMD, BV/TV, and trabecular thickness of cancellous bone, and cortical area of cortical bone (all p<0.0001) — confirming the unloading model produced substantial bone loss. Mechanical testing showed unloaded bones had significantly reduced maximum load, elastic load, and energy absorption (all p<0.0001) — i.e., weaker bones.

Compared to hindlimb unloading alone, the group receiving 1 hour/day of WBPA showed significantly increased BMD (p<0.05), BV/TV (p<0.05), and trabecular thickness (p<0.0001) of cancellous bone. On mechanical testing, WBPA-treated bones showed increased maximum load, elastic load, and energy absorption (p<0.001 to p<0.0001) relative to unloading alone — meaning the bones were measurably stronger, not just denser on imaging.

Methodology Notes

This is an animal (rat) study, not a human trial. Hindlimb unloading is a well-established model for bed rest, immobilisation, and spaceflight-analogue bone loss, but findings in rats do not automatically translate to equivalent effects, doses, or timeframes in humans.

The study measured cancellous bone outcomes and mechanical strength, not cortical bone density directly — WBPA improved cancellous BMD/BV/TV/trabecular thickness, but the paper's own comparison did not report a corresponding WBPA effect on cortical area specifically (unloading reduced cortical area; the abstract does not report WBPA reversing this cortical-area loss to the same degree as it did for cancellous measures).

This is the first WBPA study located in this specific area (immobilisation-induced bone loss) during this research round — it sits alongside a small, specialised WBPA literature base concentrated on nitric oxide/vascular mechanisms; independent replication of this specific bone-loss finding does not yet exist.

Full Citation

Liu X, Li J, Wang H, Wu F, Wang H, Jiang K, Yuan M, Xu Z, Kan G, Liu S, Dai X, Li W, Wang B, Li Z. (2025). Whole-body periodic acceleration: a new countermeasure against bone loss induced by long-term hindlimb unloading. European Journal of Applied Physiology, 126(5), 2833–2843. https://doi.org/10.1007/s00421-025-06110-8

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