The effect of different ranges of motion on local dynamic stability of the elbow during unloaded repetitive flexion–extension movements

Gsell, Kelsey Y.; Beaudette, Shawn M.; Graham, Ryan B.; Brown, Stephen H.M.

doi:10.1016/j.humov.2015.05.007

Cited by 1 publication

(1 citation statement)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whole lumbar spine ROM differences in this constrained condition were small [male mean increase of 4 degrees (8.6% change) and female mean decrease of 1.7 degrees (4.0% change)] and not statistically significant, indicating that spine motion was similar in both movement conditions as the magnitude was not significantly influenced by the pelvic constraint. Previous research has also demonstrated that ROM magnitude does not inherently influence LyE (Gsell et al, 2015). However, co-variates often associated with sex differences, including height and weight, could influence this effect as our female sample population were considerably shorter and lighter than the male participants.…”

Section: Discussionmentioning

confidence: 72%

Characterizing Local Dynamic Stability of Lumbar Spine Sub-regions During Repetitive Trunk Flexion-Extension Movements

Larson

Yun-xi

Zwambag

et al. 2019

Front. Sports Act. Living

View full text Add to dashboard Cite

Using a technique of tracking intersegmental spine kinematics via skin surface markers, this study aimed to estimate local dynamic spine stability across smaller sub-regions (or segments) of the lumbar spine while also considering the impact of an external pelvic constraint during repetitive movements. Sixteen participants (10 males) performed two trials [Free Motion (FM), Pelvis Constrained (PC)] each consisting of 65 repetitive trunk flexion-extension movements to assess dynamic spine stability using maximum Lyapunov exponents (LyE). First, results indicated that LyE obtained from analysis of 30 repetitive flexion-extension movements did not differ from those obtained from analysis of greater numbers of repetitive movements, which aligns with results from a previous study for the whole lumbar spine. Next, for both males and females, and FM and PC trials, the most caudal region of the lumbar spine behaved the most dynamically stable, while upper lumbar regions behaved the most dynamically unstable. Finally, females demonstrated greater lumbar and intersegmental stability (lower LyE) during PC trials compared to FM, while males demonstrated slightly decreased lumbar and intersegmental stability (higher LyE) during PC trials compared to FM; this resulted in PC trials, but not FM trials, being different between sexes. Altogether, these data show that dynamic stability of lumbar spine sub-regions may be related to the proximity of the motion segment to rigid skeletal structures, and that consideration is needed when deciding whether to constrain the pelvis during analyses of dynamic spine stability.

show abstract

Section: Discussionmentioning

confidence: 72%