Muscle References

Functional significance of Spinal Memory
“It would appear protective to avoid loading immediately after a bout of prolonged flexion. In the occupational world this has relevance to ambulance drivers, for example, who drive to an accident scene without the luxury of time to warm up (or reset the passive tissues ) before lifting. They would be wise to sit with a lumbar pad to avoid lumbar flexion and the associated creep. The athletic world provides good examples as well, such as sitting on the bench before engaging in play. Those with sensitive backs would do well to avoid sitting on the bench with a flexed lumbar spine while waiting to perform."
McGill , Stuart. Low Back Dissorders Eidence-based Prevention and Rehabilitation. 2. Champaign,IL: Human Kinetics, 2007.97

"Reduced reflex may indicate that the spine is less stable following prolonged flexion-relaxation and, therefore, susceptible to injury. The absence of recovery in reflex after a substantial time indicates that increased low back pain risk from flexion-relaxation may persist after the end of the flexion task."
Ellen L. Rogers and Kevin P. Granata, Disturbed Paraspinal Reflex Following Prolonged Flexion-Relaxation and Recovery.

"The creep induced in the viscoelastic tissues of the spine as a result of cyclic loading desensitizes the mechanoreceptors within, which is manifest in dramatically diminished muscular activity, allowing full exposure to instability and injury, even before fatigue of the musculature sets in."
Solomonow, Moshe PhD, MD(hon); Zhou, Bing-He EE; Baratta, Richard V. PhD; Lu, Yun MD; Harris, Mitchel MD Spine. 24(23):2426, December 1, 1999. 1999 Volvo Award Winner in Biomechanical Studies: Biomechanics of Increased Exposure to Lumbar Injury Caused by Cyclic Loading: Part 1. Loss of Reflexive Muscular Stabilization. (C) 1999 Lippincott Williams & Wilkins, Inc.