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Biomedical subjects

R A Oppliger

Publications and source records attributed to R A Oppliger.

At least 19 recordsLinked to original sources
PubMed2001

Blood and urinary measures of hydration status during progressive acute dehydration.

PURPOSE: To determine whether: a) plasma osmolarity (Posm) is sensitive to small incremental changes in hydration status, b) urine specific gravity (Usg) can accurately identify a state of euhydration, c) Usg is a sensitive indicator of a change in hydration status, and d) Usg correlates with Posm. METHODS: Euhydrated (Posm = 288 +/- 4 mOsm.L-1) subjects (N = 12) were dehydrated by 5% of their body weight via exercise in the heat (40 degrees C, 20% RH). Posm, urine osmolarity (Uosm), and Usg were measured at 1%, 3%, and 5% dehydration, and 30 and 60 min of recovery (rec). Subjects consumed water in recovery equal to their loss of body weight. RESULTS: Posm increased incrementally with each successive increase in percent body weight loss (%BWL). Usg was not significantly different from baseline until 3% BML. Uosm was not significantly different from baseline until 5% BWL. Usg correlated moderately (r = 0.46, P > 0.10) with Posm but reasonably well (r = 0.68, P < 0.02) with Uosm. CONCLUSIONS: Posm accurately identifies a state of euhydration and is sensitive to changes in hydration status during acute dehydration and rehydration. Usg and Uosm are also sensitive to changes in hydration status but lag behind during periods of rapid body fluid turnover and therefore correlate only moderately with Posm during acute dehydration.

Adult↗
PubMed2001

A comparison of leg-to-leg bioelectrical impedance and skinfolds in assessing body fat in collegiate wrestlers.

A comparison of the leg-to-leg bioelectrical impedance (BIA) system and skinfold analysis in estimating % body fat in a large number of National Collegiate Athletic Association (NCAA) collegiate wrestlers was conducted. A series of 5 cross-sectional assessments, including the NCAA Division I and III Championships, were completed throughout the 1998-1999 wrestling season with samples ranging from (N = 90-274). Body density was determined from the 3 skinfold measures using the Lohman prediction equation. BIA measurements were determined using the Tanita body fat analyzer, model 305. Significant correlations between methods ranging from (r = 0.67-0.83, p < 0.001) and low standard error of estimates (SEE) for % body fat ranging from 2.1-3.5% were found throughout the 5 assessment periods. This preliminary study demonstrated that the leg-to-leg bioelectrical impedance system accurately estimated % body fat when compared to skinfolds in a diverse collegiate wrestling population.

Adolescent↗
PubMed2000

New equations improve NIR prediction of body fat among high school wrestlers.

STUDY DESIGN: Methodologic study to derive prediction equations for percent body fat (%BF). OBJECTIVES: To develop valid regression equations using NIR to assess body composition among high school wrestlers. BACKGROUND: Clinicians need a portable, fast, and simple field method for assessing body composition among wrestlers. Near-infrared photospectrometry (NIR) meets these criteria, but its efficacy has been challenged. METHODS AND MEASURES: Subjects were 150 high school wrestlers from 2 Midwestern states with mean +/- SD age of 16.3 +/- 1.1 yrs, weight of 69.5 +/- 11.7 kg, and height of 174.4 +/- 7.0 cm. Relative body fatness (%BF) determined from hydrostatic weighing was the criterion measure, and NIR optical density (OD) measurements at multiple sites, plus height, weight, and body mass index (BMI) were the predictor variables. RESULTS: Four equations were developed with multiple R2s that varied from .530 to .693, root mean squared errors varied from 2.8% BF to 3.4% BF, and prediction errors varied from 2.9% BF to 3.1% BF. The best equation used OD measurements at the biceps, triceps, and thigh sites, BMI, and age. The root mean squared error and prediction error for all 4 equations were equal to or smaller than for a skinfold equation commonly used with wrestlers. CONCLUSION: The results substantiate the validity of NIR for predicting % BF among high school wrestlers. Cross-validation of these equations is warranted.

Adipose Tissue↗
PubMed1998

Wisconsin minimum weight program reduces weight-cutting practices of high school wrestlers.

OBJECTIVE: Winconsin high school wrestlers were surveyed 1 year before (90W) and 2 years after (93W) a new program was implemented to restrict weight loss for competition. The Wisconsin wrestling minimal weight program (WMWP) included a minimal weight limit determined from percent body fat and a nutrition education program. DESIGN: A retrospective survey of wrestlers was conducted, with schools stratified to reflect school size and quality of the wrestling program. PARTICIPANTS: Respondents surveyed in 1990 included 713 wrestlers from 45 schools; 368 wrestlers from 29 of the same schools responded to an identical survey in 1993. MAIN OUTCOME MEASURES: Measures of weight-cutting practices, weight-loss methods, bulimic behaviors, and nutritional knowledge. RESULTS: The most weight lost (MWL), the weight lost to certify (WLC), the weekly weight cycled (WWC), the longest fast (LF), and the frequency of cutting weight (FCW) all decreased significantly (chi 2, p < 0.05) among 93W wrestlers compared with 90W wrestlers. The results for the 90W group are as follows: MWL, 3.2 kg +/- 2.6; WLC, 2.8 kg +/- 2.8; WWC, 1.9 kg +/- 1.5; LF, 20.5 hours +/- 17.2; FCW, 6.2 +/- 6.4. The results for the 93W group are as follows: MWL, 2.6 kg +/- 2.6; WLC, 2.4 kg +/- 2.9; WWC, 1.6 kg +/- 1.4; LF, 16.5 hours +/- 15.6; FCW, 4.7 +/- 6.7. Weight-loss methods, including restricting food or fluids and use of rubber suits, declined significantly (chi 2, p < 0.05). Wrestlers exhibiting more than one of the Diagnostic and Statistical Manual of Mental Disorders (DSM-III-R)-related bulimic behaviors decreased by 11% (chi 2, p < 0.05), but those exhibiting all five (1.6%) remained the same. CONCLUSIONS: The results suggest that the WMWP appeared to reduce unhealthy weight-loss behaviors among high school wrestlers. Other states should be encouraged to institute similar programs as recommended by the American Medical Association and the American College of Sports Medicine.

Adult↗
PubMed1996

Patients' views about physician participation in assisted suicide and euthanasia.

OBJECTIVE: To elucidate the effect of physician participation in physician-assisted suicide and euthanasia on the physician-patient relationship. DESIGN: A questionnaire administered to 228 adult patients. SETTING: A university-based family practice training program. PATIENTS/PARTICIPANTS: We approached 230 individuals of at least 19 years of age who were patients in the study practice. These individuals were selected on the basis of age and gender to ensure a heterogeneous study population. Of these, 228 agreed to participate and completed the questionnaire. RESULTS: The majority of subjects felt that a physician who assists with suicide or performs euthanasia is capable of being a caring person (91% and 88%, respectively) and would still be able to offer emotional support to surviving family members (85% and 70%, respectively). Most also felt that a physician assisting in suicide or euthanasia would be as trustworthy as a nonparticipating physician to care for critically ill patients (90.5% and 84.6%, respectively). Five percent "likely would not" continue to see their physician if it was known that he or she assisted in suicide and 7.8% "likely would not" continue seeing their physician if it was known that this physician performed euthanasia. No individuals stated that they "definitely would not" continue seeing their doctor under either circumstance. Individuals who supported the ideas of physician-assisted suicide and euthanasia were more likely to think that a physician who assisted with suicide and euthanasia could perform well in the tasks noted above and would be more likely to continue seeing such a physician (p = .001). CONCLUSION: Participating in physician-assisted suicide and euthanasia does not markedly adversely affect the physician-patient relationship.

Adult↗
PubMed1996

American College of Sports Medicine position stand. Weight loss in wrestlers.

Despite a growing body of evidence admonishing the behavior, weight cutting (rapid weight reduction) remains prevalent among wrestlers. Weight cutting has significant adverse consequences that may affect competitive performance, physical health, and normal growth and development. To enhance the education experience and reduce the health risks for the participants, the ACSM recommends measures to educate coaches and wrestlers toward sound nutrition and weight control behaviors, to curtail "weight cutting," and to enact rules that limit weight loss.

Humans↗
PubMed1995

The Wisconsin wrestling minimum weight project: a model for weight control among high school wrestlers.

In 1989, the Wisconsin Interscholastic Athletic Association implemented a project including new rules and an educational program, consistent with ACSM and AMA guidelines, to curtail "weight cutting" among high-school wrestlers. The project included skinfold estimates of body fatness to determine a minimum competitive weight, a limit on weekly weight loss, and presentation of nutrition education information to help wrestlers diet effectively. Implementation of the project has overcome a variety of obstacles and has received widespread endorsement from parents, teachers, wrestlers, and coaches. The success of this project offers a model for other states to emulate and should encourage clinicians in other sports to initiate interventions addressing these unhealthy weight loss behaviors.

Adipose Tissue↗
PubMed1993

Bulimic behaviors among interscholastic wrestlers: a statewide survey.

Wrestlers are known for their extreme weight-cutting practices including fasting, food and fluid restriction, and dehydration. Using a stratified statewide survey, this investigation elucidated weight loss practices, nutritional knowledge, and bulimic behaviors among 713 high school wrestlers in Wisconsin. Results showed that 1.7% of the wrestlers answered questions consistent with all five criteria for bulimia nervosa, a rate higher than expected for adolescent males. An additional 43% exhibited weight-cutting practices similar to those of the wrestlers who met all bulimia nervosa criteria. The average wrestler lost 3.2 kg to compete, cycled 1.8 kg weekly, and fasted 20 hours prior to weigh-in. More extreme behaviors occurred among the 45% who met two or more bulimia nervosa criteria on their questionnaire; 19% frequently fasted, 25% restricted fluids, 34% used rubber suits, and 8% vomited. These results are comparable with data published over the past 20 years. Efforts to curtail these behaviors through regulations restricting weight loss coupled with sound nutritional information are warranted. Physicians and health professionals should be alert to potential eating disorders within this population.

Adolescent↗
PubMed1991

Midwest wrestling study: prediction of minimal weight for high school wrestlers.

This study determined the validity of previously published or newly derived equations to predict fat-free body mass (FFB) in high school wrestlers from the midwestern United States. Five laboratories participated in the data-pooling study (total sample of 860 subjects). Measures included body composition by underwater weighing and anthropometric measurements of body mass, stature, and selected circumferences, diameters, and skinfolds. Cross-validation of selected equations to predict FFB revealed the lowest levels of error from the equations of Lohman, Thorland et al., Katch and McArdle, and Behnke and Wilmore. Modification of the constants in these equations or generation of new equations did not substantially reduce prediction error. Overall, total error for these top equations ranged from 2.44 to 2.59 kg. However, based on observed trends, this error was of lower magnitude with the younger and lighter subjects and of higher magnitude with the older and heavier subjects. We conclude that these equations could be used singularly or collectively to determine FFB, and a minimal weight could then be derived and assigned to a scholastic wrestler.

Adolescent↗
PubMed1991

Wrestlers' minimal weight: anthropometry, bioimpedance, and hydrostatic weighing compared.

The need for accurate assessment of minimal wrestling weight among interscholastic wrestlers has been well documented. Previous research has demonstrated the validity of anthropometric methods for this purpose, but little research has examined the validity of bioelectrical impedance (BIA) measurements. Comparisons between BIA systems has received limited attention. With these two objectives, we compared the prediction of minimal weight (MW) among 57 interscholastic wrestlers using three anthropometric methods (skinfolds (SF) and two skeletal dimensions equations) and three BIA systems (Berkeley Medical Research (BMR), RJL, and Valhalla (VAL]. All methods showed high correlations (r values greater than 0.92) with hydrostatic weighting (HW) and between methods (r values greater than 0.90). The standard errors of estimate (SEE) were relatively small for all methods, especially for SF and the three BIA systems (SEE less than 0.70 kg). The total errors of prediction (E) for RJL and VAL (E = 4.4 and 3.9 kg) were significantly larger than observed nonsignificant BMR and SF values (E = 2.3 and 1.8 kg, respectively). Significant mean differences were observed between HW, RJL, VAL, and the two skeletal dimensions equations, but nonsignificant differences were observed between HW, BMR, and SF. BMR differed significantly from the RJL and VAL systems. The results suggest that RJL and VAL have potential application for this subpopulation. Prediction equation refinement with the addition of selected anthropometric measurement or moderating variables may enhance their utility. However, within the scope of our study, SF and BMR BIA appear to be the most valid methods for determining MW in interscholastic wrestlers.

Adolescent↗
PubMed1990

Siblings as change agents for promoting the functional status of children with cerebral palsy.

This study evaluated the effectiveness of a four-month intervention program in which 31 siblings of 15 children with cerebral palsy were taught about cerebral palsy and what they could do to encourage their brother or sister to be more independent. The teaching was reinforced by home visits to develop individual plans for the children with cerebral palsy, and sibling group meetings were held to discuss progress and to provide support. Following this intervention, the children with cerebral palsy had significantly increased range of motion of the shoulder, elbow and wrist. There were also improvements in ambulation, personal hygiene, dressing and feeding. These findings indicate that siblings should be involved in the plant of care for children with disability, since they can be important teachers, rôle models and agents of change.

Activities of Daily Living↗
PubMed1990

Human intestinal water absorption: direct vs. indirect measurements.

Distilled water, a carbohydrate-electrolyte (CE; 4% sucrose, 2% glucose, 17.2 meq/l NaCl, and 2.8 meq/l KCl) solution, or a 10% glucose solution, all containing the nonabsorbed indicator polyethylene glycol (PEG) and deuterium oxide (D2O, 30 ppm), were infused (15 ml/min) into the duodenojejunum of seven men by using the triple lumen technique. Net water absorption was determined directly from the change in PEG concentration and was calculated from plasma D2O derived from D2O in the perfusion solutions. The protocol included a 45-min equilibration period followed by a 90-min test period. Intestinal samples were drawn at 10-min intervals from 15 to 45 min and at 15-min intervals thereafter. Blood was drawn at 45, 50, 55, 60, 75, 90, 105, 120, and 135 min. Intestinal samples were analyzed for D2O, Na+, K+, osmolality, PEG, and glucose; blood was analyzed for D2O. Results (+/- SE; positive values secretion, negative values absorption) showed net fluid absorption from distilled water (-9.40 +/- 1.28 ml.h-1.cm-1) and the CE (-13.30 +/- 1.22 ml.h-1.cm-1) solution, but net secretion (4.40 +/- 1.25 ml.h-1.cm-1) from the 10% glucose solution. All values were significantly (P less than 0.05) different from each other. Perfusing the CE solution caused net Na+ and K+ absorption, whereas perfusing the 10% dextrose solution caused net electrolyte secretion. Rates of D2O accumulation in the plasma were independent of the solutions perfused.(ABSTRACT TRUNCATED AT 250 WORDS)

Glucose↗
PubMed1990

Eating behaviors, weight loss methods, and nutrition practices among high school wrestlers.

Wrestlers lose weight frequently, using rapid weight reduction methods in order to qualify for a certain weight classification. Under these conditions, the potential for developing eating disorders seems apparent. A questionnaire was used to evaluate binge eating and bulimic behaviors, nutrition practices, and weight loss methods in 716 wrestlers. Subjects lost 4.0 kg, on average, to certify, and cycled (lost and regained) 2.3 kg weekly. Two-thirds gained weight in the postseason. The most frequently used weight loss methods included increased exercise, food restriction, gradual dieting, and heated wrestling rooms. Subjects relied primarily on coaches and fellow wrestlers for sources of weight management. Using symptom severity levels by Hawkins and Clement (1980) and the Diagnostic and Statistical Manual of Mental Disorders (3rd ed.; DSM-III; American Psychiatric Association, 1980) criteria, 2.8% of subjects were classified as bulimic; 1.4% using DSM-III-R (3rd ed.; rev; American Psychiatric Association, 1987); and 1.4% met both DSM-III and DSM-III-R. There were significant differences between the diagnostic (DG) and nondiagnostic groups (NDG) in weight lost to certify, weekly weight fluctuation, postseason weight gain, and severity of binge eating. The DG used fasting, food and fluid restriction, dehydration methods, and laxatives significantly more often to promote weight loss. They also experienced significantly more negative feelings during and following binging. Implications for nursing research and clinical practice are also discussed.

Adolescent↗
PubMed1988

Metabolic effects of repeated weight loss and regain in adolescent wrestlers.

This study examined resting metabolic rate in adolescent wrestlers to test the hypothesis that repeated cycles of weight loss and regain would be associated with reduced energy requirements. Energy restriction lowers resting metabolic rate in normal-weight and obese persons. Repeated cycles of weight loss and regain can increase food efficiency, defined as the degree of weight change per unit of food intake, in animals. Many wrestlers lose weight repeatedly as they "cut weight" for matches. This cycle of weight loss and regain may affect their resting metabolism. Twenty-seven wrestlers were classified as cyclers or non-cyclers based on their weight loss history. Resting metabolic rate was measured using indirect calorimetry and body composition was evaluated using six skinfolds. Cyclers and noncyclers did not differ in age, weight, height, surface area, lean body mass, or percent body fat. Cyclers had a significantly lower mean resting metabolic rate than noncyclers (154.6 vs 177.2 kJ/m2/h) (4.6 vs 5.5 kJ per kilogram of lean body mass per hour). There was a 14% difference between the cyclers and the noncyclers in resting energy expenditure (6631.8 vs 7702.8 kJ/d). Weight cycling in wrestlers appears to be associated with a lowered resting metabolic rate.

Adolescent↗