Weight-bearing exercise is known to improve bone mineral density, however, excessive
forces exerted on the lumbar spine can be pathologic. Cadaveric studies have calculated
a hypothetical “critical compression force” at which the lumbar spine would suffer
collapse. In addition, recent studies have suggested that bone density correlates
with strength. Thus far studies have failed to examine elite power athletes to determine
the possible upper range for bone mineral density and critical compression force.
Therefore, we recruited the current world record holder in the squat lift, with a
record squat lift > 469 kg, for an examination of lumbar spine bone mineral density.
The subject had dual energy x-ray absorptometry (DEXA) and magnetic resonance imaging
(MRI) performed of the lumbar spine. The subject also had serum chemistries, cell
blood count and testosterone levels performed. DEXA scan revealed the highest bone
mineral density reported to date. MRI revealed normal alignment, no evidence of disc
herniation or compressive disc disease. There was no frank or neural foraminal canal
stenosis. The estimated compressive force generated on his lumbar spine during the
squat lift of > 469 kg doubles the previously reported critical compression force.
This case study supports the previously described relationship between strength and
bone density and redefines the upper limits of bone density in strength athletes.
Critical compression force, spine, weight-lifting, strength, bone density, dual energy
x-ray absorptometry.
