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A Comprehensive Evaluation of Spine Kinematics, Kinetics, and Trunk Muscle Activities During Fatigue-Induced Repetitive Lifting.
Kazemi, Zeinab; Mazloumi, Adel; Arjmand, Navid; Keihani, Ahmadreza; Karimi, Zanyar; Ghasemi, Mohamad Sadegh; Kordi, Ramin.
Affiliation
  • Kazemi Z; 48439 Tehran University of Medical Sciences, Iran.
  • Mazloumi A; 48439 Tehran University of Medical Sciences, Iran.
  • Arjmand N; 68260 Sharif University of Technology, Iran.
  • Keihani A; 48439 Tehran University of Medical Sciences, Iran.
  • Karimi Z; 48439 Tehran University of Medical Sciences, Iran.
  • Ghasemi MS; 440827 Iran University of Medical Sciences, Iran.
  • Kordi R; 48439 Tehran University of Medical Sciences, Iran.
Hum Factors ; 64(6): 997-1012, 2022 09.
Article in En | MEDLINE | ID: mdl-33497290
OBJECTIVE: Spine kinematics, kinetics, and trunk muscle activities were evaluated during different stages of a fatigue-induced symmetric lifting task over time. BACKGROUND: Due to neuromuscular adaptations, postural behaviors of workers during lifting tasks are affected by fatigue. Comprehensive aspects of these adaptations remain to be investigated. METHOD: Eighteen volunteers repeatedly lifted a box until perceived exhaustion. Body center of mass (CoM), trunk and box kinematics, and feet center of pressure (CoP) were estimated by a motion capture system and force-plate. Electromyographic (EMG) signals of trunk/abdominal muscles were assessed using linear and nonlinear approaches. The L5-S1 compressive force (Fc) was predicted via a biomechanical model. A two-way multivariate analysis of variance (MANOVA) was performed to examine the effects of five blocks of lifting cycle (C1 to C5) and lifting trial (T1 to T5), as independent variables, on kinematic, kinetic, and EMG-related measures. RESULTS: Significant effects of lifting trial blocks were found for CoM and CoP shift in the anterior-posterior direction (respectively p < .001 and p = .014), trunk angle (p = .004), vertical box displacement (p < .001), and Fc (p = .005). EMG parameters indicated muscular fatigue with the extent of changes being muscle-specific. CONCLUSION: Results emphasized variations in most kinematics/kinetics, and EMG-based indices, which further provided insight into the lifting behavior adaptations under dynamic fatiguing conditions. APPLICATION: Movement and muscle-related variables, to a large extent, determine the magnitude of spinal loading, which is associated with low back pain.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Lifting / Muscle Fatigue Type of study: Prognostic_studies Limits: Humans Language: En Journal: Hum Factors Year: 2022 Document type: Article

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Lifting / Muscle Fatigue Type of study: Prognostic_studies Limits: Humans Language: En Journal: Hum Factors Year: 2022 Document type: Article