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Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

BACKGROUND: Various treatment methods for senile primary sarcopenia have been developed, but all of them are restrictedly used in clinical practice due to their limitations. Therefore, it is necessary to find a safe treatment with good patient compliance. OBJECTIVE: To explore the clinical effect of radial extracorporeal shockwave therapy combined with resistance exercise on senile primary sarcopenia. METHODS: Forty elderly patients with primary sarcopenia admitted in the First Affiliated Hospital of Jinzhou Medical University from February to August 2021 were collected and randomly divided into control group and treatment group with 20 cases in each group. Both two groups were subjected to resistance exercise. The treatment group was treated with radial extracorporeal shockwave therapy based on resistance exercise. Skeletal muscle index, walking speed, knee extension muscle strength, thigh circumference, and serum insulin growth factor-1 level were recorded before treatment and after 4 weeks and 8 weeks of treatment. All data were statistically analyzed. RESULTS AND CONCLUSION: Significant differences were found in skeletal muscle index, walking speed, knee extensor strength, thigh circumference and serum insulin growth factor-1 level in both control and treatment groups at different time points (P < 0.05). After 4 and 8 weeks of treatment, knee extensor strength and serum insulin growth factor-1 level were significantly better in the treatment group than the control group (P < 0.05). After 8 weeks of treatment, the circumference of the thigh was significantly improved in the treatment group compared with the control group (P < 0.05). These findings indicate that compared with resistance training alone, radial extracorporeal shockwave therapy combined with resistance training can better promote the recovery of muscle quality and function and delay the occurrence and development of senile primary sarcopenia. [ABSTRACT FROM AUTHOR]

Taking the main bearing of a diesel engine as the study object， the lubrication state analysis model of the main bearing is established by taking the roughness and elastic deformation of the main bearing surface into account， and the influence of the radial profile of the main bearing on the lubrication state is analyzed. The results show that， compared with the calculated results without considering the radial journal profile， when the influence of the radial journal profile is taken into account， the minimum oil film thickness of the main bearing increases by 25.95%， the maximum oil film pressure decreases by 17.69%， the mean friction power loss decreases by 6.14% and the inclination of the spindle neck is improved. With the increase of journal roughness， the minimum oil film thickness increases， the maximum oil film pressure almost invariably， and the mean friction power loss increases.

Copyright of Forest Research is the property of Forest Research Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To investigate the relationship between BMI and age and fracture risk calculated by FRAX as well as bone mineral density (BMD) of distal radius of the non-dominant arm in male and female residents of Beijing southern suburbs． Methods A retrospective analysis of 2 680 patients，including 944 males and 1 736 females，who had dual-energy x-ray absorptiometry (DXA) examination in our hospital from January 2015 to June 2017 was conducted，and the related clinical data were collected． BMI values were calculated，BMD of the distal radius of the non-dominant arm of the examinee was measured，and the FRAX website was used to calculate the FRAX fracture risk score． Grouped by age and BMI，analysis of variance was used to study the relationship between distal radius BMD and FRAX fracture risk score and BMI and age． The LSD method was used to compare the differences in BMD and FRAX fracture risk score between the BMI groups and age groups． Results ① BMD of distal radius of the non-dominant arm decreased with increasing age in residents of Beijing southern suburbs． The probability of major osteoporotic fracture (PMOF) of FRAX fracture risk score increased with age，with significant differences among age groups (P < 0. 05) ． In all age groups BMD was higher in males than in females． The PMOF FRAX fracture risk score was lower in males than that in females (P < 0. 05) ． ② BMD of distal radius of the non-dominant arm of adults in Beijing southern suburbs increased with the increase of BMI，and the differences were statistically significant (P < 0. 05) ． Regardless of sex，the PMOF fracture risk score peaked at the 24 to 27. 9 BMI (overweight) group，and was lower in the normal BMI and obese groups than in the overweight group． ③The BMD in each group of BMI was higher in males than that in females． The PMOF FRAX fracture risk score was lower in men than in women，and the difference was statistically significant (P < 0. 05) ． Conclusion BMD of the distal radius and the PMOF FRAX fracture risk score were correlated with sex，age and BMI of the subjects． Of the same age and BMI，the fracture risk of females was higher than that of males． With increase in age，BMD decreased，and the risk of fractures increased． With the increase of BMI，the BMD of distal radius increased gradually，but the risk of fracture did not decrease with the increase of BMD，and the risk of fracture was the highest in the overweight category and the lowest in the normal weight category． Therefore overweight is a risk factor for fracture． By using FRAX software，measuring the BMD of distal radius，and taking full account of gender，age，BMI and other factors，the risk of fracture in patients can effectively assessed． [ABSTRACT FROM AUTHOR]