Spinal shrinkage during repetitive controlled torsional, flexion and lateral bend motion exertions

Article Abstract:

Research describing an experiment to analyse spinal shrinkage caused by repetitive exertions is presented. In particular stadiometry was used to investigate the cumulative loading in flexion, lateral bend and torsional planes.

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Regression models for the prediction of dynamic L4/L5 compression forces during lifting

Article Abstract:

The effectivity of mathematical regression model in the determination of the peak L4/L5 disc compression force during dynamic, sagittal plane lifting was evaluated. Two models were developed, one which required four inputs and featured an RMS error of 8.3%. The other model featured an RMS error of 9.7%. The results showed that both models were effective and were suitable for ergonomic applications.

Regression analysis

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Loads on spinal tissues during simultaneous lifting and ventilatory challenge

Article Abstract:

Muscles of the torso play a significant part in the stabilization of the lower back and to help in ventilation. This provoked a study to unite a load challenge to the low back with a breathing challenge corresponding to what a worker may experience when shovelling snow. Two out of eight subjects exhibited entrainment of abdominal activity to breathing that caused additional cyclic low-back compressive loading order when small low-back demands were combined with a breathing challenge and higher ventilation rates.

Physiological aspects, Back

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