Effectiveness of progressive muscle relaxation on sleep disturbance in athletes

Background: Athletes have general complaints about sleep disturbance which is important for body recovery, healthy brain and body functions, tissue wear and tear, and the body's immune system. Objective: To determine the effectiveness of Progressive Muscle Relaxation (PMR) on sleep disturbance in athletes. Methodology: N=24 athletes aged 18 to 36 years participating in a competition were included in a randomized controlled trial. Athletes who were training for a competition, aged between 18 -and 36 years, and athletes with sleep disturbance score (SDS) falling above 4 on the Athletic Sleep Screening Questionnaire were included. Athlete sleep screening questionnaire (ASSQ) was used to assess sleep disturbance score (SDS). Athletes were randomly assigned to the experimental (n=12) and control (n=12) groups. The experimental group was given progressive muscle relaxation and re-assessed the next day for SDS. Results: The pre-post analysis showed that progressive muscle relaxation reduced the athletes' sleep disturbance score significantly one day after the intervention with a large effect size (p=0.006 Cohen's d= 1.44) in the experimental group. The mean of the mean differences of SDS of both groups were compared which showed a group had a significantly improved sleep disturbance score compared to a control group with a large effect size. (Mean= 1.41 ±1.44 v/s 0.00±1.85, p≤ 0.01, Cohen's d= 1.66). Conclusion: Progressive Muscle Relaxation exercises can be a non-pharmacological method to help athletes sleep by simple head-to-toe muscles contract and relax technique. Clinical Trail No: NCT0569509

Effect of staining solutions and repolishing on color stability of direct composites

OBJECTIVES: The purpose of this study was to assess the color change of three types of composite resins exposed to coffee and cola drink, and the effect of repolishing on the color stability of these composites after staining. MATERIALS AND METHODS: Fifteen specimens (15 mm diameter and 2 mm thick) were fabricated from microhybrid (Esthet-X; Dentsply and Filtek Z-250; 3M ESPE) and high-density hybrid (Surefil; Dentsply) composites, and were finished and polished with aluminum oxide discs (Sof-Lex; 3M ESPE). Color of the specimens was measured according to the CIE L*a*b* system in a refection spectrophotometer (PCB 6807; BYK Gardner). After baseline color measurements, 5 specimens of each resin were immersed in different staining solutions for 15 days: G1 - distilled water (control), G2 - coffee, G3 - cola soft drink. Afterwards, new color measurement was performed and the specimens were repolished and submitted to new color reading. Color stability was determined by the difference (&#916;E) between the coordinates L*, a*, and b* obtained from the specimens before and after immersion into the solutions and after repolishing. RESULTS: There was no statistically signifcant difference (ANOVA, Tukey's test; p>0.05) among the &#916;E values for the different types of composites after staining or repolishing. For all composite resins, coffee promoted more color change (&#916;E>3.3) than distilled water and the cola soft drink. After repolishing, the &#916;E values of the specimens immersed in coffee decreased to clinically acceptable values (&#916;E<3.3), but remained signifcantly higher than those of the other groups. CONCLUSIONS: No signifcant difference was found among composite resins or between color values before and after repolishing of specimens immersed in distilled water and cola. Immersing specimens in coffee caused greater color change in all types of composite resins tested in this study and repolishing contributed to decrease staining to clinically acceptable &#916;E values