Torso muscles contribute both intrinsic and reflexive stiffness to the spine; recent modeling
studies indicate that intrinsic stiffness alone is sometimes insufficient to maintain stability in …

Objective. To quantify the time-varying stiffness and kinematic responses of the in vivo
lumbar spine exposed to dynamic repetitive flexion movements. Design. Changes in in vivo …

Study Design. Repeated measures experimental study of the effect of flexion-relaxation,
recovery, and gender on paraspinal reflex dynamics. Objective. To determine the effect of …

The purpose of this study was to (1) compare trunk neuromuscular behavior between
individuals with no history of low back pain (LBP) and individuals who experience exercise …

Introduction: When the spine is subjected to perturbations, neuromuscular responses such
as reflex muscle contractions contribute to the overall balance control and spinal …

People with a history of low back pain (LBP) are at high risk to encounter additional LBP
episodes. During LBP remission, altered trunk muscle control has been suggested to …

Study Design. An experimental study of healthy subjects' trunk muscle responses to force
perturbations at differing angles and steady state efforts. Objectives. To determine whether …

Study Design. A split-plot experimental design was used to evaluate the influence of
posture, trunk angle, and rotational velocity on peak torque output and myoelectric activity …

Trunk stability requires muscle stiffness associated with appropriate timing and magnitude of
activation of muscles. Abnormality of muscle function has been implicated as possible cause …

Objective. To evaluate the impact of muscle pre-activation levels and load magnitude on the
response of the trunk to loading conditions causing rapid flexion. Design. Eight male …