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

Abstract

Microgravity is associated with stature increases, back pain and post-flight intervertebral disc (IVD) herniation. This study aims to determine whether 30s seated 50% body weight (BW) axial loading is comparable to 15min sitting upright in 1g upon changes in stature, anterior lumbar IVD height (via ultrasound), passive vertebral stiffness (VS), and back pain induced by 4h hyper-buoyancy floatation (HBF) unloading. Sixteen (seven male) healthy volunteers had stature, lumbar IVD height (L2-S1), passive VS (C1-L5) and back pain assessed before and following 4h HBF, and immediately after participants performed a 30s seated squat with 50% of their BW or 15min sitting upright. Four hours of HBF unloading induced significant increments in stature (+1.6±0.5cm; P<0.001), IVD height (L2-L3: P=0.002; L3-L4: P<0.001; L4-L5: P=0.013; L5-S1: P<0.001) and back pain (2.90±1.26; P<0.001) with no differences between 1 and 1.5BW. Stature, IVD height increments and back pain were similarly attenuated in both reloading groups. Passive VS was unchanged by 4h HBF or reloading. HBF-induced back pain positively correlated with stature (P=0.01) and lumbar IVD height changes (L2-L3: P=0.03; L3-L4: P=0.01; L5-S1: P=0.02). Four hours of HBF increased stature, lumbar IVD height and induced moderate back pain that were similarly (albeit not entirely) ameliorated by both 15min upright sitting and 30s of 50% BW axial loading, with no changes in passive VS observed. IVD geometric changes appear key to space adaptation back pain and stature increments that can be rapidly modulated by brief periods of axial loading.