The aim was to examine lumbar spine kinematics, spinal joint loads and trunk muscle activation patterns during a prolonged (2 h) period of sitting. This information is necessary assist the ergonomist in designing work where posture variation possible—particularly between standing various styles Joint were predicted with highly detailed anatomical biomechanical model (that incorporated 104 muscles, passive ligaments intervertebral discs), which utilized biological signals electromyograms...

There have been no previous studies that quantitatively assessed the load on spine during extensor exercises. The purpose of our study was to investigate loading lumbar and trunk muscle activity levels while subjects performed typical exercises.Thirteen male volunteers (mean age = 21.0 years, SD 1.0, range 19-23; mean height 176.0 cm, 6.2, 165-188; mass 77.0 kg, 7.0, 63-89) participated.The four different back Electromyographic (EMG) recorded from 14 muscles. postures corresponded maximum...

Frost, DM, Beach, TAC, Callaghan, JP, and McGill, SM. Using the functional movement screen™ to evaluate effectiveness of training. J Strength Cond Res 26(6): 1620–1630, 2012—The Functional Movement Screen™ (FMS) has demonstrated some efficacy in prediction injuries is thus used by many practitioners make recommendations for exercise. However, questions remain regarding its utility as a means Sixty firefighters volunteered participate, their FMS scores were examined before after 12 weeks...

With the recent attention to 'sitting disease', health practitioners and scientists are promoting standing in workplace decrease sedentary time, despite a high prevalence of low back pain (LBP) development during prolonged standing. The purpose this study was assess how seated break inserted between bouts would influence LBP development, posture movement. A total 20 participants stood for 45 minutes, sat 15 minutes repeated sequence while lumbar thoracic angles were measured, visual analogue...

Objective: The objective of the study was to evaluate differences between sitting on a stability ball and in an office chair terms trunk muscle activation lumbar spine posture. Background: Stability balls have become increasingly popular as alternative chairs help reduce prevalence low back pain; however, little research has been conducted their use chairs. Methods: 14 participants (7 men, 7 women) were required sit both for 1 hour each while performing various computer workstation tasks...

Study Design Technical note. Objectives To provide background theory and information to describe relevant applications of autocorrelation cross-correlation methodology as they apply the field motor control in human movement rehabilitation research. Background Commonly used methodologies for pattern event recognition, determination muscle activation timing investigation coordination, are generally difficult implement, particularly with large datasets. A brief description underlying...

Background: Little is known about how lumbar spine movement influences mechanical changes and the potential injurious effects of prolonged flexion associated with seated postures. The purpose this study was to examine postural responses pa

In Brief Study Design. Basic scientific investigation using radiologic, histochemical, and microscopic dissection techniques. Objective. To document the process of mechanically induced disc herniation from repetitive loading exposure. Summary Background Data. Current knowledge mechanism is limited to only a few postmortem studies with even fewer attempts damage during developing stages herniation. Methods. Sixteen porcine cervical spine motion segments (C3–C4) were mounted in custom...