Sex-based differences in lifting technique under increasing load conditions: A principal component analysis.

The objective of the present study was to determine if there is a sex-based difference in lifting technique across increasing-load conditions. Eleven male and 14 female participants (n = 25) with no previous history of low back disorder participated in the study. Participants completed freestyle, symmetric lifts of a box with handles from the floor to a table positioned at 50% of their height for five trials under three load conditions (10%, 20%, and 30% of their individual maximum isometric back strength). Joint kinematic data for the ankle, knee, hip, and lumbar and thoracic spine were collected using a two-camera Optotrak motion capture system. Joint angles were calculated using a three-dimensional Euler rotation sequence. Principal component analysis (PCA) and single component reconstruction were applied to assess differences in lifting technique across the entire waveforms. Thirty-two PCs were retained from the five joints and three axes in accordance with the 90% trace criterion. Repeated-measures ANOVA with a mixed design revealed no significant effect of sex for any of the PCs. This is contrary to previous research that used discrete points on the lifting curve to analyze sex-based differences, but agrees with more recent research using more complex analysis techniques. There was a significant effect of load on lifting technique for five PCs of the lower limb (PC1 of ankle flexion, knee flexion, and knee adduction, as well as PC2 and PC3 of hip flexion) (p < 0.005). However, there was no significant effect of load on the thoracic and lumbar spine. It was concluded that when load is standardized to individual back strength characteristics, males and females adopted a similar lifting technique. In addition, as load increased male and female participants changed their lifting technique in a similar manner.

Endoscopic retrograde cholangio-pancreatography: related nosocomial infections.

The flexible endoscopes of a gastroenterology department were microbiologically examined after one patient developed a possible nosocomial infection. The endoscopes were found to be contaminated by pseudomonas species. An appropriate cleaning regime was developed and the initial difficulties in sterilising the instruments are described. The medical records of all ERCPed patients for the one and half years prior to and the half year after the monitoring exercise were examined. It was found that approximately 50 percent of patients examined in the half year prior to the introduction of endoscopic monitoring had infections with Pseudomonas species.