Biomedical subjects

J Wessel

Publications and source records attributed to J Wessel.

61 records · Page 4Linked to original sources

PubMedDate not supplied

Physiological and perceptual responses during household activities performed by healthy women.

OBJECTIVE: The purpose of this study was to describe the physiological and perceptual responses during two physically demanding household tasks: cleaning the bathroom and vacuuming the living room. It also examined the relationship between predicted aerobic fitness and the physiological responses during the two tasks. METHOD: Seventeen healthy women between 30 and 50 years of age volunteered as participants. They were interviewed to gather demographic information required for prediction of aerobic fitness and observed while performing each task for 17 min to 20 min in their own home. RESULTS: The heart rate, an index of circulatory strain, varied considerably among the participants and was moderately high during both tasks. Vacuuming the living room had a higher level of circulatory strain and perceived exertion than cleaning the bathroom. An inverse relationship existed between the predicted aerobic fitness and heart rate responses during the two tasks. CONCLUSION: Routine household tasks result in a significant circulatory strain in healthy women. Persons with high levels of aerobic fitness experience a lower degree of circulatory strain.

Adult↗

PubMedDate not supplied

Validity of the baltimore therapeutic equipment work simulator in the measurement of lifting endurance in healthy men.

OBJECTIVE: To examine the criterion validity of the Baltimore Therapeutic Equipment (BTE) work simulator by comparing endurance time, oxygen uptake (VO2), and heart rate measured during real and simulated lifting tasks and to derive a regression equation for predicting actual lifting endurance from measurements on the work simulator. METHOD: Twenty healthy male volunteers repetitively lifted and lowered a load of 40 lb using the BTE work simulator and actual weights at a laboratory workstation. Postures, location, and frequency of lifts were kept constant. Endurance (defined as the time taken for the rating of perceived exertion to increase 2 units on the Borg scale) was measured under both conditions. VO2 and heart rate were also recorded, using standard physiological procedures. RESULTS: The mean values for endurance time, steady-state VO2, and heart rate were significantly different between the real and simulated tasks (p < .05). Correlation of endurance time between the two tasks was significant (r = .71, p < .05). Step wise regression analysis resulted in the following equation for predicting real endurance from simulated time measurements: predicted real time = .34 simulated time + 3.29; r = .71; SE = 1.00 min. CONCLUSION: The BTE work simulator tends to overestimate real lifting endurance performance in healthy men. The lower physiological stress during the simulated task suggests a significant difference between the real and simulated loads. Occupational therapists should exercise caution when using the results of the BTE work simulator during functional capacity evaluations.

Adolescent↗

PubMedDate not supplied

[Umbilical cord complications as a cause of intrauterine fetal death].

In a group of 71 intrauterine fetal deaths in monozygotic pregnancies, umbilical cord complications were the cause of death in 11 cases (16%). These included 5 umbilical knots, 3 loops, and one case each of torsion with constriction, umbilical prolapse and velamentous insertion (with rupture of the umbilical vessels). The relative importance of these umbilical complications is pointed out and discussed in regard to clinical and pathological factors.

Adult↗

PubMedDate not supplied

[Deliveries in patients with more than 1 cesarean section].

The mode of delivery in 49 women with two or more previous cesarean sections was examined. In 33 cases (67%) a primary re-cesarean section was performed, in 12 of 16 patients (75%) a vaginal birth was possible. Emphasis was given to the causes leading to the latest cesarean section to the maternal and infant conditions and complications and the relevant factors from earlier cesarean sections. The results were discussed by comparison to related publications. Some fundamental considerations about the mode of delivery in cases of repeated cesarean sections were presented. The justifications for a repeated primary cesarean section based on the previous record to two or more cesarean sections alone seems to be no longer given.

Asphyxia Neonatorum↗

PubMedDate not supplied

[Special obstetric problems in managing labor following cesarean section].

The prevalence of primary repeat cesareans in the 37th and 38th weeks of gestation and the highest rate of premature births explain the shorter duration of pregnancy associated with this mode of delivery. In cases where ecbolics were administered labour was prolonged and the rate of secondary repeat cesareans was higher. Late rupture of the amniotic sac seems to increase the chances of successful vaginal delivery. Biparietal cranial diameter had no influence on the mode of delivery; significantly higher values were found only in cases of cranial-pelvic incongruity. The frequency of primary repeat cesareans increased in proportion to the age of the mother. The time interval since the previous cesarean delivery is of no importance. Birth weights were lower in the group of elective repeat cesareans owing to lower gestational age. It does not always appear justified to rule out a vaginal birth in cases of twins. Regional anesthesia is not a contraindication.

Adult↗

PubMedDate not supplied

[Management of labor following cesarean section].

Of 451 deliveries between 1 July 1981 and 30 June 1987, in patients having previously undergone a cesarean section, 279 (62%) were vaginal births, 80 (18%) were primary and 92 (20%) secondary repeat cesareans. The highest frequency of vaginal deliveries was in cases with prior abnormal presentation (87%). History continues to play an important role: vaginal deliveries were achieved in 59% of the cases in which the cesarean section was the only previous delivery. This rate increased to 89% if the subsequent birth was vaginal. Uterine rupture occurred in 10 cases (2.2%). The mode of delivery had no significant influence on the incidence of acidosis; in the repeat cesarean cases the newborns had poorer one-minute Apgar scores.

Asphyxia Neonatorum↗

PubMedDate not supplied

[The content of membrane-bound and free ribosomes in growing saccharomyces cells at different temperatures (author's transl)].

The distribution of membrane-bound and free ribosomes was investigated at different temperatures in growing yeast cells. During duplication phases of the cell a changing pattern of the amount of membrane-bound and free ribosomes can be found at all temperatures investigated: at points where there is a maximum of membrane-bound ribosomes, one can always find a minimum of free ribosomes. The ribosomal content is significantly higher at 30 degrees C than it is at 20 degrees C, and higher at 20 degrees C than at 40 degrees C, whereas the duplication time of the cells is only slightly longer at 40 degrees C, but extremely longer at 20 degrees C than at 30 degrees C.

Cell Membrane↗