Document Type : Original Article
Authors
1
Biomechanics Unit, Basic Sciences Department, Faculty of Physical Therapy, Galala University, Suez, Egypt. Biomechanics Department, Faculty of Physical Therapy, Cairo University, Cairo, Egypt.
2
Department of Physical Therapy for Basic Science, Faculty of Physical Therapy, Cairo University
3
Department of Basic Sciences, Faculty of Physical Therapy, Galala University, Suez, Egypt. Department of Physical Therapy for Basic Science, Faculty of Physical Therapy, Cairo University, Giza, Egypt.
Abstract
Background: Induced fatigue of the shoulder muscles can significantly impact the kinematics and muscle power of the upper extremity, potentially leading to musculoskeletal injuries. Understanding these effects is crucial for developing effective interventions and rehabilitation protocols. Purpose: This systematic review investigated the impact of induced fatigue of the shoulder muscles on the sensorimotor functions of the upper extremity. Methods: The review followed PRISMA guidelines. A comprehensive search was conducted in five databases for clinical trials examining the effects of shoulder muscles fatigue on sensorimotor functions of the upper extremity. Inclusion criteria included various study designs. Data extraction covered participant characteristics, intervention details, outcome measures, and results. Data synthesis involved meta-analysis using MedCalc software. Results: A total of 25 clinical trials were included in this systematic review of which five studies went through meta-analysis. Induced fatigue significantly impacts the arthrokinematics of the glenohumeral joint, affecting the dispersion of the helical axis of rotation and altering the position of the humeral head within the glenoid cavity. Fatigue also alters humeral head migration. However, pooled statistical analysis of five studies showed no statistically significant difference in proprioceptive acuity (Z= 0.875, 95%CI [-1.037 - 2.708], P = 0.382) with significant heterogeneity among the included studies (I2 97.05%, P < 0.0001). Conclusion: Induced fatigue of the shoulder complex musculature may influence the kinematics and muscle power of the upper extremity. However, the low methodological quality of the included trials and significant heterogeneity in the investigated variables hinder drawing definitive conclusions. More high-quality RCTs are required to reach a definitive conclusion regarding the effects of induced fatigue on upper extremity sensorimotor functions.
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