A recent study found that the core muscle, multifidus, was delayed in activation in subjects that sat slumped for an hour. This resulted in reduced back protection and an increase risk of low back pain and injury. However, when the subjects received an adjustment to their lower back there was an increase in activation of the muscle which was associated with a decrease in disability and pain. This improvement was still seen a week later. Its great to see the science is catching up to what chiropractors have seen clinically for years.