50% body weight loading reduces stature increases and lumbar disc expansion from 4 h hyper-buoyancy floatation versus 15 min sitting upright.

Δ Back pain also positively correlated with Δ L2–L3, Δ L3–L4 and Δ L5–S1 anterior IVD height, but Δ L4–L5 IVD height failed to reach statistical significance. Δ back pain also failed to correlate with Δ overall passive VS, or that of any segment (Table 6 ). 4 DISCUSSION The main findings of the study were that 4 h HBF unloading induced significant increments in standing stature, back pain and anterior IVD height at all levels from L2 to S1 in both groups.

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