The research...
Risch's study (SPINE 1993) reported
that specific exercise for isolated lumbar extensor muscles
substantially increased low-back strength in chronic low
back pain patients versus a wait-listed control group.
Additionally, increased strength was associated with perceived
improvements in physical and psychosocial functioning.
Risch et al., SPINE 1993 - COPY AVAILABLE
Nelson et al. reported that 76% of patients completing
the treatment programme had excellent or good results (definition:
"both substantial pain relief and substantial improvement
in strength")
Nelson et al. ORTHOPEDICS October 1995 - CLICK TO READ