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Articles Related to Fatigue

Mattress Coil Spring Fatigue and Support: A Potential Association with Spine Stiffness and Pain

Prolong mattress use compresses the metal coil springs which may ultimately result in a compromised sleeping surface. This coil spring metal fatigue can result in spinal pain and stiffness. The purpose of this study was to compare the amount of metal fatigue of used mattress coil springs from the areas bearing greatest body weight versus areas subjected to little compression to ascertain the. Six weight bearing coil springs (WBS) were extracted from the center the used (range 8-10 yr.) mattresses (N=32) and six non-weight bearing coil springs (NWBS) were extracted from the head/foot are of the same mattresses. To determine spring weakness a special frame and platform was constructed to compare unloaded spring height with compression distance height following placement of a 1,296 g ingot on the platform. Also, a pressure gauge was used to measure the amount of pressure required to compress the coil springs a distance of 2 cm. Comparison between WBS and NWBS data were statistically treated using independent t-tests and a one-way ANOVA. There were no significant group differences in weight or height in unloaded coils. However, there were significant (p<0.05) differences in coil spring compression distance under load (WBS = 2.78 ± 0.34 cm; NWBS = 1.52 ± 0.39 cm) and force gauge compression (WBS = 1090.51 ± 88.42 g; NWBS = 1213.12 ± 71.38 g) between groups. While manufacturers’ recommendations to replace a mattress is ranges between 8 and 10 yrs., these results indicate that coil spring weakness may occur before 8 yrs. of use. Weak springs leads to loss of weight bearing capacity of the mattress thereby resulting in sagging upon use. Such sagging which may compromise sleep posture with accompanying back pain and poor sleep quality and quantity.
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Evaluation of Paraspinal Muscle Properties in Adolescents with Mild Idiopatic Scoliosis Using Surface EMG Power Spectral Analysis

Previous studies reported that the paraspinal muscles of adolescents with severe idiopathic scoliosis scheduled for surgery contain higher proportion of type Ⅰ fibers on the convex side. However, the muscle properties are unknown in mild adolescent idiopathic scoliosis. The objective of this study was to evaluate the differences among the convex, concave and control sides of the paraspinal muscles in patients with mild AIS and healthy individuals and to help in the treatment of mild AIS patients.
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Evaluation of fatigue resistance of acetal resin and cobalt–chromium removable partial denture clasps. An in-vitro study: Part I

This study was aimed to evaluate the retentive forces of acetal resin clasps and Cobalt-Chrome (Co-Cr) clasps during attachment/detachment cycles on abutment teeth with two different undercuts and at different intervals.
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A Model Proposal for Long-Lasting Electromagnetic Forces-Biological System Interaction: Molecular Fatigue Damages

None of the known interaction models of electric and magnetic fields with the biological system can completely explain the effects which occur as a result of long-lasting exposure to electric and magnetic fields. We think that effects which cannot be explained by exposure to long-lasting, and albeit very low, electro-magnetic effects arise from molecular fatigue and the damage accumulation which occurs as a result of it.
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Anti-Inflammatory Effects of β-Glucan in Cancer Related Fatigue

Immune-mediated inflammatory diseases are among the exhausting diseases which are often difficult to diagnose. Fatigue is the most common syndrome accompanying cancer diseases and treatment. In cancer patients, fatigue is not only a manifestation of treatment, but also reflects biological effects of the tumor.
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Editorial Board Members Related to Fatigue

Daolun Chen

Professor
Department of Mechanical and Industrial Engineering
Ryerson University
Canada

Mellar P. Davis

Professor
Case Comprehensive Cancer Center
Case Western Reserve University
United States

Shirley Mcilvenny

Professor
Department of Health and Nutrition
National Institute of Integrative Medicine
Australia

WINNIE CHAN

Department of Nutrition & Dietetics
University Hospitals Birmingham NHS Foundation Trust
United Kingdom
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