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The effect of active exoskeleton support with different lumbar-to-hip support ratios on spinal musculoskeletal loading and lumbar kinematics during lifting.
Wearable Technol
December 2024
Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, Amsterdam, The Netherlands.
While active back-support exoskeletons can reduce mechanical loading of the spine, current designs include only one pair of actuated hip joints combined with a rigid structure between the pelvis and trunk attachments, restricting lumbar flexion and consequently intended lifting behavior. This study presents a novel active exoskeleton including actuated lumbar and hip joints as well as subject-specific exoskeleton control based on a real-time active low-back moment estimation. We evaluated the effect of exoskeleton support with different lumbar-to-hip (L/H) support ratios on spine loading, lumbar kinematics, and back muscle electromyography (EMG).
View Article and Find Full Text PDFElectromyography-Informed Estimates of Joint Contact Forces Within the Lower Back and Knee Joints During a Diverse Set of Industry-Relevant Manual Lifting Tasks.
J Appl Biomech
January 2025
Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA.
Repetitive manual labor tasks involving twisting, bending, and lifting commonly lead to lower back and knee injuries in the workplace. To identify tasks with high injury risk, we recruited N = 9 participants to perform industry-relevant, 2-handed lifts with a 11-kg weight. These included symmetrical/asymmetrical, ascending/descending lifts that varied in start-to-end heights (knee-to-waist and waist-to-shoulder).
View Article and Find Full Text PDFAnalysis of Dynamic Mandibular Movement of Patients With Condylar Hyperplasia Treated With Orthognathic Surgery and Condylectomy.
J Craniofac Surg
January 2025
Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology.
Objective: To assess the dynamic mandibular movement of patients with condylar hyperplasia before and after simultaneous orthognathic surgery and condylectomy through an intraoral approach.
Methods: Two groups of patients diagnosed with unilateral condylar hyperplasia were studied: the preoperative group consisted of 23 patients and the postoperative group consisted of 13 patients who had undergone simultaneous orthognathic surgery and condylectomy through an intraoral approach with follow-up for more than 1 year. The normal reference value was obtained from 11 individuals without oral and maxillofacial diseases.
Background: The goal of this study was to examine the effects of spinal cord stimulation (SCS) on muscle activity during walking after lower-limb amputation. Amputation results in a loss of sensory feedback and alterations in gait biomechanics, including co-contractions of antagonist muscles about the knee and ankle, and reduced pelvic obliquity range-of-motion and pelvic drop. SCS can restore sensation in the missing limb, but its effects on muscle activation and gait biomechanics have not been studied in people with lower-limb amputation.
View Article and Find Full Text PDFTrunk muscle behaviors during the full-cycle stoop and squat lifting tasks.
PeerJ
January 2025
Department of Orthopedics, Xuanwu Hospital Capital Medical University, Beijing, China.
Background: Lifting is generally considered as a risk factor for low back pain. A thorough investigation of the muscle function during lifting is essential for a better assessment of the potential risk of muscle impairment and towards improvements in lifting strategy. We aimed to compare the activities of the trunk muscles between the stoop and the squat lifting tasks.
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