جستجوی مقالات مرتبط با کلیدواژه "perceived exertion" در نشریات گروه "پزشکی"

Occupational back pain is one of the musculoskeletal disorders (MSDs) caused by manual load-lifting among women involved in manual lifting activities. Limits for lifting loads are used to assess the risk and prevention of occupational back pain. The Washington Industrial Safety and Health Act (WISHA) checklist is used as a permissible load assessment limit in Iran. The present study aimed to evaluate the reliability of using the WISHA checklist to determine the allowable limits of manual load-lifting among women based on biomechanical and psychophysical methods.

In this study, ten women workers aged 20-30 years with a history of manual load-lifting were asked to perform 21 load-lifting tasks designed according to the permitted limits of Iran. A wireless electronic clinometer was used to determine the flexion angles of the trunk while lifting the load. Anthropometric information, load weight, trunk angle, and posture were entered into 3DSSPP software to obtain biomechanical forces for each task and compared them with the recommended National Institute for Occupational Safety and Health (NIOSH) limits. After performing each task, the rate of perceived exertion of each person for each task was collected by using the Borg scale.

The flexion angle for 47.61% of the lifting tasks were more than 20 degrees. The estimated average compressive force for the six tasks exceeded NIOSH’s recommended limits. The average Borg scale was determined hard for 33.33% of lifting tasks and hard to very hard for 9.52% of tasks.

It was found that the manual load-lifting standard for some tasks might not be sufficient to control and prevent low back pain caused by manual lifting in women, and some non-compliance was found with the allowable lifting limits. Manual load-lifting with anthropometric and biomechanical features may increase the biomechanical force on the women’s low back. Therefore, it seems that the allowable lifting limits of Iran for women based on the WISHA checklist should be reviewed and redesigned based on anthropometric and biomechanical characteristics.

Beetroot is a rich source of antioxidants and rich in nitrates. The present study aimed to investigate the effects of beetroot consumption on blood pressure, heart rate, perceived Exertion, and the speed of running in young female athletes.

For this purpose, 10 young female athletes participated in this cross-over double blind study. Subjects were randomly placed into placebo (n=5) or beetroot (200 g containing 500 mg Nitrate; n=5) groups. They ran 5 Km on treadmill. The wash-out period for them was one week. Systolic and diastolic blood pressure were measured before and 3 hours after beetroot consumption and after the 5 Kilometer run. Heart rate, perceived exertion, and the speed of running at the distances of 1.6 and 3.2 kilometers were recorded. Two-way ANOVA with repeated measures and independent t-test were used for data analysis.

The results showed that beetroot consumption significantly reduced systolic blood pressure before and after the exercise, and reduced diastolic blood pressure before the exercise. Heart rate was significantly decreased in beetroot group after 1.6 and 3.2 kilometers run, but no significant difference was found between beetroot and placebo groups at the end of 5 kilometer run. Perceived exertion was significantly reduced at the end of 1.6 kilometer run but not after 3.2 and 5 kilometer run in the beetroot group. The alterations in the speed of running at 1.6, 3.2 and 5 kilometers were not significantly different between the groups.

According to the results of this study, in addition to the health benefits of vegetables, nitrate-rich vegetables can improve performance of training.