RESUMO
The prevalence of overweight, indicated by Body Mass Index (BMI: 23-24.9 kg/m2), pre-obese (25-29.9 kg/m2) and obesity (>30 kg/m2) has increased in recent years. There has been a change in sleeping patterns(reduction in number of hours of sleep, quality of sleep, delay in onset of nighttime sleep) with the increasein BMI in Asian population, but studies are limited.Study included 230 college students from 18 to 24 years of which 171 were males. They were screened formajor diseases and psychological problems. Subjects having sleep disorders who are under medication wereexcluded. Sleep patterns, latency, duration, habitual sleep efficiency, sleep disturbances and daytimedysfunction were assessed using Pittsburgh Sleep Quality Index (PSQI).Association between PSQI components and BMI as per Asian criteria was assessed using Likelihood Ratio.Among all the studied 7 individual components, association of BMI code as per Asian criteria with sleeplatency and sleep disturbance component were significant (p<0.05). The awareness about sleep habits isneeded for good sleep quality.
RESUMO
Purpose of the study: The effect of free loaded and after loaded condition in mammalian skeletal musclecontraction can be studied using an in-situ nerve-muscle preparation in rat. The experimental setup mimicsthe physiological conditions very closely unlike the classical in vitro frog nerve-muscle preparation andhence could be considered as an effective practical module to demonstrate the work done in a skeletalmuscle in both free loaded and after loaded condition.Methodology: A simple, feasible and novel practical is designed in which muscle twitch is recorded in anin-situ nerve-muscle preparation of an anaesthetized rat under free loaded and after loaded condition atdifferent weights using an isotonic transducer. Work done was calculated under free loaded and after loadedcondition and compared.Main finding: Difference was observed with respect to displacement and work done during free loaded andafter loaded condition. Work done was higher in free loaded condition.Conclusion: We propose a simple and novel practical to demonstrate the effect of free loaded and afterloaded condition in muscle twitch for undergraduate teaching in physiology.