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PubMedDate not supplied

Energy turnover at the Race Across AMerica (RAAM) - a case report.

We report about energy intake and energy expenditure in an official finisher of the Race Across AMerica (RAAM) in 2003. Energy intake from nutrition was continuously recorded. Energy expenditure was measured by continuous heart rate recording with a portable heart rate monitor POLAR S710 to estimate energy expenditure during physical activity. Our athlete (33 years, 179 cm, 73 kg, VO (2)max 60 ml . min (-1) . kg (-1), lactate threshold at 77%VO (2)max) finished the 4701-km cycling race with altitude differences amounting to 25,826 meters in 9 days 16 hours and 45 minutes in 4th place. He completed 470+/-72.9 km (372-541 km) per day with 2,582+/-1,576 (683-5,047) meters of altitude. During the whole race, he expended a total energy of 179,650 kcal with 17,965+/-2165 (15,100 - 23,280) kcal per day. Total energy intake was 96,124 kcal with an average of 9,612+/-1,500 (7,513-12,735) kcal per day. Of total ingested calories, 75.2% derived from carbohydrates, 16.2% from fat, and 8.6% from protein. He ingested an energy of 9,612+/-1,550 (7,513 - 12,735) kcal daily, consisting of 1,814+/-310 (1,336 - 2,354) g of carbohydrates, 172+/-47 (88-251) g of fat, and 207+/-52 (128-286) g of protein. The average daily energy deficiency amounted to 8,352+/-2,523 (4,425-13,631) kcal. A total deficiency of 83,526 kcal resulted after the race while the athlete lost 5 kg of body weight. These results provide data about energy intake and energy expenditure in the RAAM for future athletes, nutritionists and coaches. Further investigation should be performed in order to determine whether either muscle mass or body fat will be lost in extreme endurance cycling.

Adult↗
PubMed1999

The effect of race and sex on physicians' recommendations for cardiac catheterization.

BACKGROUND: Epidemiologic studies have reported differences in the use of cardiovascular procedures according to the race and sex of the patient. Whether the differences stem from differences in the recommendations of physicians remains uncertain. METHODS: We developed a computerized survey instrument to assess physicians' recommendations for managing chest pain. Actors portrayed patients with particular characteristics in scripted interviews about their symptoms. A total of 720 physicians at two national meetings of organizations of primary care physicians participated in the survey. Each physician viewed a recorded interview and was given other data about a hypothetical patient. He or she then made recommendations about that patient's care. We used multivariate logistic-regression analysis to assess the effects of the race and sex of the patients on treatment recommendations, while controlling for the physicians' assessment of the probability of coronary artery disease as well as for the age of the patient, the level of coronary risk, the type of chest pain, and the results of an exercise stress test. RESULTS: The physicians' mean (+/-SD) estimates of the probability of coronary artery disease were lower for women (probability, 64.1+/-19.3 percent, vs. 69.2+/-18.2 percent for men; P<0.001), younger patients (63.8+/-19.5 percent for patients who were 55 years old, vs. 69.5+/-17.9 percent for patients who were 70 years old; P<0.001), and patients with nonanginal pain (58.3+/-19.0 percent, vs. 64.4+/-18.3 percent for patients with possible angina and 77.1+/-14.0 percent for those with definite angina; P=0.001). Logistic-regression analysis indicated that women (odds ratio, 0.60; 95 percent confidence interval, 0.4 to 0.9; P=0.02) and blacks (odds ratio, 0.60; 95 percent confidence interval, 0.4 to 0.9; P=0.02) were less likely to be referred for cardiac catheterization than men and whites, respectively. Analysis of race-sex interactions showed that black women were significantly less likely to be referred for catheterization than white men (odds ratio, 0.4; 95 percent confidence interval, 0.2 to 0.7; P=0.004). CONCLUSIONS: Our findings suggest that the race and sex of a patient independently influence how physicians manage chest pain.

Age Factors↗
PubMed1980

Social class and race differences in family interaction: pathological, normative, or confounding methodological factors?

The interaction patterns of 64 well-adjusted family triads, divided into eight equal groups by race, social class, and sex of adolescent, were assessed across observational and self-report measures of family affect, conflict, and dominance. Any social class or race differences similar to those of prior research could not be described as deficits since all families met extensive criteria to assure favorable psychosocial adjustment. However, in contrast to much extant literature, statistical analyses revealed few social class or race effects. In light of the present strict methodological controls, it is suggested that previous findings of race and social class differences might have resulted from uncontrolled sampling, procedural, or measurement factors.

Adolescent↗
PubMed1989

The relative salience of sex, race, age, and glasses in children's social perception.

The relative salience for children of various human facial features was examined in five experiments. The first two experiments were designed to validate the conclusion from previous research (McGraw, Durm, & Patterson, 1983) that the sex of adult faces is more salient than their race or age, and that the presence or absence of glasses is extremely unsalient. Children's spontaneous verbal descriptions confirmed the salience hierarchy of sex, race, age, and glasses. Experiments 3, 4, and 5 were designed to ascertain whether the salience of race, glasses, and age would be stable across potentially relevant subject and task-stimuli differences. There were some salience asymmetries; most notably, black skin was more salient than white skin for both Black and White children. In general, the results of these studies indicate that sex, race, age, and glasses represents a naturally occurring salience hierarchy that is reliably present among children of preschool and early elementary school age.

Black or African American↗
PubMed2003

Ethnicity or race, area characteristics, and sexual partner choice among American adolescents.

The aim of this paper is to examine the association of individual demographic variables and area characteristics with the characteristics of sexual partners of American adolescents. Data for the study were drawn from the National Longitudinal Study of Adolescent Health. The data indicate that the community characteristics of ethnic or racial composition of the population and region were most strongly related to the ethnicity or race of the partner. Regional differences in the ethnicity or race of partners were significant even after controlling for the ethnic or racial composition of the community. Differences in partner s age, grade, neighborhood, and school or residence were not related to school and community characteristics. In addition, the individual characteristics of age, gender, and race or ethnicity were also related to ethnicity or race of partner.

Adolescent↗
PubMed1987

Changes in serum haptoglobin as an acute response to a marathon road race.

In order to assess the possible occurrence of acute haemolysis with prolonged exertion, serum haptoglobin levels were determined from venous blood samples collected from eight male runners immediately preceding (PreRH), immediately following (PRH1), and 6 h following (PRH2) completion of a marathon road race. The subjects' mean age, percentage of body fat, and maximum oxygen uptake (VO2max) were 46 +/- 9 years, 12.1 +/- 3.4% and 54.9 +/- 8.4 ml kg-1 min-1, respectively. The mean race finish time for the subjects was 3:35 +/- 0:18 h:min. The PreRH, PRH1 and PRH2 averaged 129 +/-18, 97 +/- 48 and 86 +/- 35 mg dl-1 respectively. Significant differences of -32.5 mg dl-1 between PreRH versus PRH1 and -42.5 mg dl-1 between PreRH versus PRH2 were found. The difference between PRH1 and PRH2 of -10.6 mg dl-1 was not significant. No significant correlations were found between the decreases in serum haptoglobin and VO2max or race finish time. The data suggests to occurrence of an acute haemolysis with performance of the marathon road race.

Adult↗
PubMed1995

The effect of sodium bicarbonate ingestion on 1500-m racing time.

Twelve athletes, all of whom regularly participated in middle- or long-distance running races at club to national standard, competed in simulated 1500-m races under three conditions: following ingestion of 300 mg sodium bicarbonate per kg of body mass (B); following ingestion of a placebo (100 mg sodium chloride per kg of body mass and 200 mg calcium carbonate per kg of body mass) (P); and following ingestion of neither (C). A double-blind protocol was used between the B and P trials. Each condition was replicated so that the athletes competed in six races. Ten of the athletes completed all the races. The athletes' average times for trials B, P and C were 253.9, 256.8 and 258.0 s, respectively. The data were analysed using a two-way ANOVA with replicates and Tukey tests. This revealed a difference between trial B and trials P and C (P < 0.05), but no difference between trials P and C. These findings, therefore, indicate that sodium bicarbonate can have an ergogenic effect upon 1500-m running.

Administration, Oral↗
PubMed2003

Race differences in a sample of vocational rehabilitation clients with traumatic brain injury.

OBJECTIVE: To evaluate race differences in demographics, injury severity, and vocational outcomes for persons with TBI. PARTICIPANTS: Seventy-five individuals with TBI (13 African American, 62 Caucasian) who requested services from the Missouri Division of Vocational Rehabilitation (VR) over a 2-year period. MEASURES: Demographics (i.e. age, race, level of education), injury severity (i.e. LOC, PTA, length of hospitalization, neuropsychological test scores), VR services provided (e.g. transportation, maintenance, on-the-job training, etc.), and VR outcomes (successfully vs unsuccessfully employed; cost per case). PROCEDURE: All participants completed a standard neuropsychological evaluation and completed VR services (i.e. were followed from enrollment to case closure). HYPOTHESES: African Americans and Caucasians would not differ in demographics or injury severity, although fewer African Americans would be successfully employed through DVR. ANALYSES: Chi-squares and non-parametric MANOVAs to evaluate race differences in terms of demographics, injury severity, vocational services provided and vocational outcomes. RESULTS: As hypothesized, there were few race differences in demographics or injury severity, although African Americans received significantly more transportation services (62 vs 21%). Contrary to hypotheses, there was no difference in the number of successfully employed African Americans (23%) vs Caucasians (18%). CONCLUSIONS: African Americans and Caucasians with TBI achieve similar vocational successes if they receive state VR services.

Adult↗
PubMed2003

Views from the periphery: discourses of race and place in French military medicine.

Numerous authors have interpreted the history of anthropological and medical conceptions of race in nineteenth century France as following a path mapped out by phrenology, anthropometry, and Paul Broca's version of physical anthropology. On balance, this has resulted in an historical narrative centered on Parisian intellectual life and one leaving the impression that by the 1890s anthropological theories had moved away from ethnological and cultural explanations toward more biological views of race. This article, by contrast, examines the world beyond Paris and the literatures of naval and army medicine from about 1830 to 1920. It describes the contours of a medical and anthropological pluralism in matters of race and ethnicity and argues that cultural and ethnological perspectives remained important to theorists of race through World War I.

Africa↗
PubMed1993

The condom race.

The condom race is a hands-on activity that can help teach young people condom use as part of safer sex practices. Although it is well documented that students know about condom use, they often do not do what they know they should. One possible explanation for this is that the students may lack the skills and confidence they need to have when they use condoms. The condom race offers students a chance to gain skills and confidence in a humorous, nonthreatening way. During the exercise, which is based on the concept of a relay race, students touch, feel, and practice putting condoms on penis models. After participating in the activity, students reported increased confidence in their ability to use, discuss, and carry condoms. The condom race is a quick, amusing, and easy activity.

Adolescent↗
PubMedDate not supplied

Wheelchair racing efficiency.

PURPOSE: For individuals with disabilities exercise, such as wheelchair racing, can be an important modality for community reintegration, as well as health promotion. The purpose of this study was to examine selected parameters during racing wheelchair propulsion among a sample of elite wheelchair racers. It was hypothesized that blood lactate accumulation and wheeling economy (i.e. oxygen consumed per minute) would increase with speed and that gross mechanical efficiency would reach an optimum for each athlete. METHOD: Twelve elite wheelchair racers with paraplegia participated in this study. Nine of the subjects were males and three were females. Each subject used his or her personal wheelchair during the experiments. A computer monitored wheelchair dynamometer was used during all testing. The method used was essentially a discontinuous economy protocol. Mixed model analysis of variance (ANOVA) was used to compare blood lactate concentration, economy (minute oxygen consumption), and gross mechanical efficiency across the stages. RESULTS: The results of this study show that both economy and blood lactate concentration increase linearly with speed if resistance is held constant. The subjects in this study had gross mechanical efficiencies (gme) of about 18%, with the range going from 15.222.7%. The results indicate that at the higher speeds of propulsion, for example near race speeds, analysis of respiratory gases may not give a complete energy profile. CONCLUSION: While there is a good understanding of training methods to improve cardiovascular fitness for wheelchair racers, little is known about improving efficiency (e.g. technique, equipment), therefore methods need to be developed to determine efficiency while training or in race situations.

Adult↗
PubMedDate not supplied

Race, social support, and coping strategies among HIV-positive gay and bisexual men.

Few studies have examined the relation between race, social support, and coping, particularly among HIV-infected individuals. We examined the relation of race and social support to coping with HIV infection in a sample of 121 gay and bisexual men (64 African American, 57 White). Compared to White participants, African Americans reported higher use of multiple coping strategies. High levels of perceived social support were related to greater use of positive coping and seeking support; lower levels of social support were related to greater use of self-destructive coping. There were no race-related differences in social support, and no race by social support interactions. Possible explanations for observed cultural differences and coping challenges of African American gay and bisexual men with HIV are discussed.

Adaptation, Psychological↗
PubMedDate not supplied

Race, pharmacogenomics, and marketing: putting BiDil in context.

This article endeavors to place into context recent developments surrounding the United States Food and Drug Administration recent approval of BiDil (isosorbide dinitrate/hydralazine hydrochloride) (NitroMed, Inc., Lexington, MA) as the first ever race-specific drug--in this case to treat heart failure in African Americans. It focuses in particular on both commercial incentives and statistical manipulation of medical data as framing the drive to bring BiDil to market as a race-specific drug. In current discourse about pharmacogenomics, targeting a racial audience is perceived as necessary because at this point the technology and resources do not exist to scan efficiently every individual's genetic profile. The article argues that medical researchers may say they are using race as a surrogate to target biology in drug development, but corporations are using biology as a surrogate to target race in drug marketing. Pharmacogenomics may hold great promise, but on our way to that Promised Land, it is imperative to review such short cuts with a critical eye.

Advertising↗
PubMed2006

Reducing the own-race bias in face recognition by shifting attention.

The own-race bias (ORB) in face recognition can be interpreted as a failure to generalize expert perceptual encoding developed for own-race faces to other-race faces. Further, black participants appear to use different features to describe faces from those used by white participants (Shepherd & Deregowski, 1981). An experiment is reported where the size of the ORB was assessed using a standard face recognition procedure. Four groups were tested at two time intervals. One group received a training regime involving learning to distinguish faces that varied only on their chin, cheeks, nose, and mouth. Three control groups did not receive this training. The ORB, present prior to training, was reduced after the critical perceptual training. It is concluded that the ORB is a consequence of a failure of attention being directed to those features of other race faces that are useful for identification.

Attention↗
PubMed2005

Stimulant dosage and age, race, and insurance type in a sample of children with attention-deficit/hyperactivity disorder.

OBJECTIVE: The aim of this study was to examine the association of age, race, insurance, and other factors with the prescription of stimulant medications. METHODS: A retrospective chart review was conducted on 242 subjects, 4.8-19.8 years of age, treated in an urban referral center with a stable dose of stimulant medication for at least 6 months. Subjects were predominantly male (74.8%), African-American (52.9%), and insured by Medicaid (71.0%). The effects of age, race, insurance, gender, cognitive level, additional psychopharmacologic medications, and other factors on prescribed total daily dose (mg/day) and dose by weight (mg/kg/dose) were examined. RESULTS: Race and insurance type together were associated with specific patterns of stimulant dosage, with higher dosing seen in Medicaid-insured non-African-American children and in privately insured African-American children. Total daily dose increased with age; however, there was an inverse relationship between age and dose by weight. There were no significant associations of gender, cognitive level, use of additional psychopharmacological medications, or other factors with total daily dose or dose by weight. CONCLUSIONS: The sociocultural factors of race and insurance type were related to dosing of stimulant medications in children. Total daily doses increased with age, while younger children were treated with higher weight-based doses. Attention to these factors should be given in the titration of stimulant medications in the treatment of ADHD. Other factors, including gender, had no specific association.

Adolescent↗
PubMed2005

Race-ethnicity-specific waist circumference cutoffs for identifying cardiovascular disease risk factors.

BACKGROUND: Waist circumferences (WCs) in white men and women that represent a risk of cardiovascular disease (CVD) equivalent to that of body mass indexes (BMIs; in kg/m2) of 25 and 30 have been identified. However, WC cutoffs for other race-ethnicity groups remain unknown. OBJECTIVE: The objective was to determine WC cutoffs for CVD risk in non-Hispanic blacks (blacks), Mexican Americans (MA), and non-Hispanic whites (whites). DESIGN: Data from 10,969 participants in the third National Health and Nutrition Examination Survey (1988-1994) were analyzed. The presence of CVD risk factors was the main outcome. Sex- and race-ethnicity-specific WC cutoffs were determined with logistic regression models by linking WC cutoffs with equivalent CVD risk based on BMI cutoffs for overweight and obesity. WC cutoffs for metabolic syndrome risk factors were similarly calculated. RESULTS: Correlations between WC and lipid profiles, blood pressure, and glucose were significantly higher than those between BMI and these same variables in all groups. The WC cutoffs were approximately 5-6 cm greater for white than for black men at BMIs between 25 and 40, and those for MA were intermediate. In women, few differences in WC cutoffs were observed between the groups. Simplified WC cutoffs corresponding to BMIs of 25 and 30, largely independent of age, for the 3 race-ethnicity groups were 89 and 101 cm for men and 83 and 94 cm for women. Minimal distances in receiver operating characteristic curves tended to be shorter when WC cutoffs rather than BMI cutoffs were used. CONCLUSIONS: WC is a better indicator of CVD risk than is BMI in the 3 race-ethnicity groups studied. The proposed WC cutoffs are more sensitive than are BMI cutoffs in predicting CVD risk.

Adult↗
PubMed1977

Hematological and metabolic responses to training in racing sled dogs fed diets containing medium, low, or zero carbohydrate.

In a 28 week study, 18 racing sled dogs were trained to maximal fitness in 12 weeks, sustained through a racing season of 12 weeks, followed by gradual of training of 4 weeks. The dogs were fed a predominantly cereal diet prior to the study; experimental diets containing more chicken and meat by products were introduced from the 2nd to the 4th week of training. On an energy basis, the diets contained protein, fat, and carbohydrate in the proportions of 39:61:0 (diet A), 32:45:23 (diet B), and 28:34:38 (diet C). Blood samples were taken at rest just before the start of training, at 6, 12,24 and 28 weeks; 33 variables were measured on most samples. The results were subjected to analysis of variance. No adverse effects were observed in dogs fed the extreme diet A. Significant relationships to training were shown by serum glutamic oxaloacetic transaminase, creatinine, packed cell volume, calcium, hemoglobin, and globulin. Serum cholesterol concentration increased with the introduction of the higher protein-fat diets; the high concentrations attenuated with time but rose again when training was abated. Dogs on diet A maintained higher serum concentrations of albumin, calcium, magnesium, and free fatty acids during the racing season than did dogs fed diets B or C. They also exhibited the greatest increases in red cell count, hemoglobin concentration, and packed cell volume during training. High values of red cell indices were not sustained through the racing season in dogs fed diet C. In addition to attributes already widely appreciated, viz. a higher energy density an digestibility, the carbohydrate-free, high-fat diet A appeared to confer advantages for prolonged strenuous running in terms of certain metabolic responses to training.

Animals↗
PubMed2002

Relation of body composition, parental overweight, pubertal stage, and race-ethnicity to energy expenditure among premenarcheal girls.

BACKGROUND: Previous studies assessed the influence of parental weight status, sexual maturation, race-ethnicity, and energy expenditure among children, but few examined these issues comprehensively. OBJECTIVE: The objective was to determine whether differences in energy expenditure among premenarcheal girls are related to the pubertal stage and the race-ethnicity of the girls or to the weight status of their parents. DESIGN: We measured the body composition and the energy expenditure of 196 nonobese girls enrolled in a longitudinal study. Total body water was measured by the isotopic dilution of (18)O water. We measured resting metabolic rate with the use of indirect calorimetry and daily energy expenditure by the doubly labeled water method. We used established criteria to determine sexual maturation. Parental weight status was based on body mass index. RESULTS: Resting metabolic rate was higher among girls with >or=1 overweight parent than among girls with 2 normal-weight parents. Total energy expenditure was also higher among girls with >or=1 overweight parent, but these results were of borderline significance. We found no effect of pubertal stage on resting metabolic rate. Nonresting energy expenditure was significantly lower among pubertal girls than among prepubertal girls. After adjustments for age and body composition, we noted that resting metabolic rate, nonresting energy expenditure, and total energy expenditure were all significantly lower among black girls than among white girls. CONCLUSIONS: Differences in resting metabolic rate and total energy expenditure among premenarcheal girls were associated with parental weight status and the girls' race-ethnicity, whereas differences in nonresting energy expenditure were associated with pubertal stage and race-ethnicity. Whether the observed differences in energy expenditure persist after puberty and predict weight gain during puberty awaits the results of longitudinal analyses.

Black People↗