Kinetic Sensitivity of a New Lumbo-Pelvic Model to Variation in Segment Parameter Input

Abstract

This study aimed to assess variability in lumbo-pelvic forces and moments during a dynamic high-impact activity (cricket fast bowling) when calculated using different body segment parameters (BSPs). The first three BSPs were estimated using methods where the trunk was divided into segments according to nonspinal anatomical landmarks. The final approach defined segment boundaries according to vertebral level. Three-dimensional motion analysis data from nine male cricketers’ bowling trials were processed using the four BSPs. A repeated-measures analysis of variance revealed no significant effect on peak lumbo-pelvic forces. However, the segmentation approach based on vertebral level resulted in significantly larger peak flexion and lateral flexion moments than the other BSP data sets. This has implications for comparisons between studies using different BSPs. Further, given that a method defined with reference to vertebral level more closely corresponds with relevant anatomical structures, this approach may more accurately reflect lumbar moments.

Impact of performing heavy-loaded barbell back squats to volitional failure on lower limb and lumbo-pelvis mechanics in skilled lifters

“…In the data collection session, participants had retroreflective markers (Figure 1) positioned on anatomical landmarks of their lumbar and lower body (Besier, Sturnieks, Alderson, & Lloyd, 2003;Crewe, Campbell, Elliott, & Alderson, 2013a, 2013bVu, Walker, Ball, & Spratford, 2017). Markers were placed over the medial and lateral epicondyles, medial and lateral malleoli, calcaneus, heads of the first and fifth metatarsals, left and right anterior superior iliac spines, and left and right posterior superior iliac spines.…”

“…All data were filtered using a fourth order low-pass Butterworth filter with a cut-off frequency of 12 Hz, defined following a residual analysis (Winter, 2009). Joint kinetics were calculated using a standard inverse dynamics approach previously described in the literature (Besier et al, 2003;Crewe et al, 2013aCrewe et al, , 2013b.…”

Abdominal Bracing Increases Ground Reaction Forces and Reduces Knee and Hip Flexion During Landing

“…Retroreflective markers were attached to each participant's lumbar region and lower limbs, according to previously outlined marker sets 3,5,30 recommended by the International Society of Biomechanics. 31 In short, the upper lumbar region (y-axis created from markers placed over the first and third lumbar vertebrae; zaxis from the orthogonal plane created from markers placed 5 cm bilaterally from the second and third lumbar vertebrae; x-axis was the cross-product of the z-axis and y-axis) movement was calculated relative to the lower lumbar region (y-axis created from markers placed over the third and fifth lumbar vertebrae; zaxis from the orthogonal plane created from markers placed 5 cm bilaterally from the fourth and fifth lumbar vertebrae; x-axis was the cross-product of the z-axis and y-axis).…”

Effect of Footwear on the Biomechanics of Loaded Back Squats to Volitional Exhaustion in Skilled Lifters

“…Two minutes of rest was given between each AMRAP test, which aligns with the length of recovery given in other studies that have examined squatting during exercise-induced stress (2,20). Within the data collection sessions, subjects had retroreflective markers positioned on the lumbar and lower-body anatomical landmarks (1,5,6,23). Marker positions were identical to those previously described by Brice et al (2).…”