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At least 649 records · Page 36Linked to original sources
PubMed1999

Prediction of maximal back muscle strength from indices of body mass and fat-free body mass.

OBJECTIVES: The purpose of this study was to examine, in healthy volunteers, the relationship between back extensor muscle strength and body size. METHODS: The maximal voluntary isometric back extensor strength of 456 volunteers, aged 18-42 yr and with no history of low back pain, was measured in a standing, slightly flexed forward posture. This was then correlated with two indices of body size: body mass and fat-free body mass. RESULTS: Significant linear relationships were observed between back muscle strength and each of the two indices of body size. There was a gender difference in both the slope and the intercept of the regression equations describing the relationships. There was no independent influence of age within the range studied. CONCLUSION: It was possible to establish predictive equations for back extensor strength based on body size which could be used to quantify strength 'deficits', for instance in patients with low back pain, and to prescribe submaximal target forces for use in endurance training and testing.

Adult↗
PubMedDate not supplied

Developmental organization of the mushroom bodies of Thermobia domestica (Zygentoma, Lepismatidae): insights into mushroom body evolution from a basal insect.

The mushroom bodies of the insect brain are sensory integration centers best studied for their role in learning and memory. Studies of mushroom body structure and development in neopteran insects have revealed conserved morphogenetic mechanisms. The sequential production of morphologically distinct intrinsic neuron (Kenyon cell) subpopulations by mushroom body neuroblasts and the integration of newborn neurons via a discrete ingrowth tract results in an age-based organization of modular subunits in the primary output neuropil of the mushroom bodies, the lobes. To determine whether these may represent ancestral characteristics, the present account assesses mushroom body organization and development in the basal wingless insect Thermobia domestica. In this insect, a single calyx supplied by the progeny of two neuroblast clusters, and three perpendicularly oriented lobes are readily identifiable. The lobes are subdivided into 15 globular subdivisions (Trauben). Lifelong neurogenesis is observed, with axons of newborn Kenyon cells entering the lobes via an ingrowth core. The Trauben do not appear progressively during development, indicating that they do not represent the ramifications of sequentially produced subpopulations of Kenyon cells. Instead, a single Kenyon cell population produces highly branched axons that supply all lobe subdivisions. This suggests that although the ground plan for neopteran mushroom bodies existed in early insects, the organization of modular subunits composed of separate Kenyon cell subpopulations is a later innovation. Similarities between the calyx of Thermobia and the highly derived fruit fly Drosophila melanogaster also suggest a correlation between calyx morphology and Kenyon cell number.

Animals↗
PubMed2003

Comparison of 24 hour whole body versus patch tests for estimating body surface electrolyte losses.

PURPOSE: To compare dermal electrolyte loss between whole body and regional patch methods in women during 24-h. METHODS: Dermal loss was collected in 6 healthy women mean age 27 +/- 4 years, while consuming 936 mg/d sodium, 1764 mg/d potassium, 696 mg/d calcium, and 152 mg/d magnesium. Twenty-four hour whole body dermal loss was collected using cotton suits by a washdown procedure. Twenty-four hour patch loss was collected from 8 patches placed on the legs, arms, and back. RESULTS: Dermal loss from whole body was 108 +/- 110 mg/d sodium, 133 +/- 87 mg/d potassium, 103 +/- 22 mg/d calcium, and 35 +/- 13 mg/d magnesium. Electrolyte content from the 8 patches was similar among sites and ranged from 1.01-1.41 mg/d sodium, 0.35-0.83 mg/d potassium, 1.0-1.45 mg/d calcium, and 0.43-0.49 mg/d magnesium. Projections from patches to whole body by the ratio of body surface area appear to overestimate actual whole body losses by 3.2X for sodium and calcium, 3.6X for magnesium, and 1.3X for potassium. CONCLUSIONS: Regional patch methods are more appropriate for relative comparisons than for accurately determining total daily dermal electrolyte losses.

Adult↗
PubMed1987

Cooling different body surfaces during upper and lower body exercise.

The effect of varying the body surface area being cooled by a liquid microclimate system was evaluated during exercise heat-stress conditions. Six male subjects performed a total of six exercise (O2 uptake = 1.2 l/min) tests in a hot environment (ambient temperature = 38 degrees C, relative humidity = 30%) while dressed in clothing having low moisture permeability and high insulation. Each subject completed two upper body exercise (U; arm crank) tests: 1) with only the torso surface (T) cooled; and 2) with the surfaces of both the torso and upper arms (TA) cooled [coolant temperature at the inlet (Ti) was 20 degrees C for all upper body tests]. Each subject also completed four lower body exercise (L; walking) tests: 1) with only the T cooled (Ti = 20 degrees C); 2) with only the T cooled (Ti = 26 degrees C); 3) with torso, upper arm, and thigh surface (TAT) cooled (Ti = 20 degrees C); and 4) with TAT cooled (Ti = 26 degrees C). During U exercise, TA cooling had no effects compared with cooling only T. During L exercise, sweat rates, heart rates, and rectal temperature (Tre) changes were less with TAT cooling compared with cooling only the T. Altering Ti had no effect on Tre changes, but higher heart rates were observed with 26 than with 20 degrees C. These data indicate that cooling arms during upper body exercise provides no thermoregulatory advantage, although cooling the thigh surfaces during lower body exercise does provide an advantage.

Adult↗
PubMed1995

Sympathetic nervous system activity, body fatness, and body fat distribution in younger and older males.

It was hypothesized that an increase in total and central body fatness is related to higher sympathetic nervous system activity (SNSA) in older men. Resting SNSA was measured from norepinephrine (NE) kinetics in 69 younger (18-36 yr) and 69 healthy older men (55-80 yr). Body fat distribution was estimated from the waist circumference, body composition from underwater weighing, peak oxygen consumption from a treadmill test to exhaustion, and dietary intake from food diaries. Plasma NE concentrations were 41% higher (P < 0.001) in older men due to a 27% increase (P < 0.001) in NE appearance rate and a tendency for a lower NE clearance rate (P = 0.08). NE appearance rate was higher in individuals of both age groups who exhibited a greater waist circumference and body fatness (range of r values 0.49-0.69; P < 0.01). The waist circumference, and not age, was the strongest predictor of the increase in NE appearance rate in older men. Statistically controlling for the waist circumference or body fatness diminished age-related differences in NE concentrations and in NE appearance rate. These findings suggest that an accumulation of total and central body fat is associated with higher levels of SNSA in older males.

Adipose Tissue↗
PubMed2006

Measuring partial body potassium in the arm versus total body potassium.

Skeletal muscle (SM), the body's main structural support, has been implicated in metabolic, physiological, and disease processes in humans. Despite being the largest tissue in the human body, its assessment remains difficult and indirect. However, being metabolically active it contains over 50% of the total body potassium (TBK) pool. We present our preliminary results from a new system for measuring partial body K (PBK) that presently are limited to the arm yet provide a direct and specific measure of the SM. This uniquely specific quantification of the SM mass in the arm, which is shielded from the body during measurement, allows us to simplify the assumptions used in deriving the total SM, thereby possibly improving the modeling of the human body compartments. Preliminary results show that PBK measurements are consistent with those from the TBK previously obtained from the same subjects, thus offering a simpler alternative to computed tomography and magnetic resonance imaging used for the same purposes. The PBK system, which can be set up in a physician's office or bedside in a hospital, is completely passive, safe, and inexpensive; it can be used on immobilized patients, children, pregnant women, or other at-risk populations.

Adult↗
PubMed1989

Interrelationships between body weight, body fat distribution and insulin in obese women before and after hypocaloric feeding and weight loss.

The effects were investigated of weight loss on the relationship between hyperinsulinemia, body weight and body fat distribution in two groups of women with central-type obesity (CTO) (waist-to-hip ratio WHR greater than 0.85) or peripheral-type obesity (PTO) (WHR less than 0.85). An oral glucose tolerance test was carried out before and after a hypocaloric nutritional treatment lasting 4 months. Both groups were matched for age, body mass index and amount of body fat. At the basal condition, group CTO had fasting and glucose-stimulated insulin levels significantly higher than group PTO; fasting (but not stimulated) C peptide levels were also higher in CTO compared with PTO. Weight and fat loss were significantly higher in CTO than in PTO women. Moreover, unlike PTO, CTO subjects significantly reduced their WHR values. In both groups weight loss led to a significant drop in fasting and glucose-stimulated insulin and C peptide levels. However, PTO women reduced their C peptide levels significantly less than CTO. In conclusion, weight loss only modified body fat distribution in women with CTO, who appeared to be prone to a greater weight loss than the PTO women. Compared to PTO, CTO women were characterized by higher insulin levels and peripheral insulin resistance, which improved during hypocaloric feeding probably due to the combined effect of weight loss and the change in body fat distribution.

Adipose Tissue↗
PubMed1998

Interaction between body size and cardiac workload: influence on left ventricular mass during body growth and adulthood.

The development of the left ventricle parallels body growth. During infancy, the relation between body size and left ventricular (LV) mass is very close. With advancing age, variability of LV mass in relation to body size markedly increases. To test the hypothesis that the age-related increase in variability of LV mass is due to the progressive impact of hemodynamic stimuli on LV growth, quantitative M-mode echocardiograms were obtained in 766 normal-weight, normotensive individuals over a range of ages from 1 day to 85 years (330 female subjects, 373 subjects younger than 18 years). LV mass was linearly related to height2.7 (r2=.69). Prediction of values of LV mass by body size was more accurate at birth and progressively less precise with increasing age. Stroke work (stroke volume times systolic pressure) was closely related to LV mass (r2=.74). The explained variance of LV mass increased from 69% in the univariate regression with height2.7 to 82% in a multivariate model including height2.7, stroke work, and gender. In children and adolescents (younger than 18 years), height2.7 was the main determinant of LV mass, whereas during adulthood stroke work and gender were more important predictors of LV mass than height2.7. Thus (1) the influence of body growth on development of LV mass decreases after early infancy because of both the variability of hemodynamic load and the increasing effect of gender; (2) after adolescence, during adulthood, in normotensive, normal-weight individuals, the impact of hemodynamic load and male gender on LV mass is greater than the one of body size; and (3) an appreciable proportion of variability of LV mass remains unexplained with the studied models. This might be due to genotypic variations and/or measurement error.

Adult↗
PubMed2005

Adjusted body weight, con: why adjust body weight in energy-expenditure calculations?

Evaluation of energy requirements of normal individuals and hospitalized patients is most often accomplished using an energy equation. Energy equations attempt to measure resting metabolic rate (RMR), the largest factor in total daily energy expenditure. Components of most energy equations include height, weight, age, and gender. These factors are related to energy expenditure; however, each factor has individual characteristics that affect energy expenditure. Body weight is a major factor in RMR and total daily energy expenditure. For obese individuals, estimation of energy expenditure may be a challenge due to the increased body weight. Therefore, some equations attempt to minimize the effect of body weight on energy expenditure assessment by adjusting the obese individual's body weight. Data do not support adjustment of body weight in normal individuals. In hospitalized patients, there are several equations that are used to estimate energy expenditure of obese patients, which include adjusting the body weight and modifying the overall energy requirements. Measurement of RMR can obviate the need for estimating energy expenditure. It is important to evaluate any energy-expenditure equation that is used to estimate energy needs in normal people and hospitalized patients before applying it to patient care.

Basal Metabolism↗
PubMed2005

Individual differences in male body-image: an examination of self-objectification in recreational body builders.

OBJECTIVES: Male bodybuilders have been found previously to have higher levels of disordered eating and body-image disturbance than do other men. This study investigated whether objectification theory (Fredrickson & Roberts, 1997) could be used to explain these observed differences in male body-image. DESIGN: A cross-sectional, self-report design was used. METHODS: Three samples of men were recruited: bodybuilders (N = 31), weightlifters (N = 17), and non-athletic controls (N = 35). Participants completed a questionnaire containing measures of self-objectification, self-surveillance, body shame, appearance anxiety, and four outcomes: body dissatisfaction, drive for muscularity, bulimia, and depression. RESULTS: As predicted, bodybuilders had significantly higher levels of self-objectification than weightlifters and controls, and higher levels of body dissatisfaction and drive for muscularity than controls. Overall, the relationships between self-objectification and the outcome variables, and self-surveillance and the outcome variables, were mediated by appearance anxiety. CONCLUSIONS: Bodybuilding is associated with outcomes that suggest it may not result in greater overall health for men. It was concluded that objectification theory provides a useful framework for examining body-image differences in men.

Adolescent↗
PubMed2005

Rapid automated measurement of body fat distribution from whole-body MRI.

OBJECTIVE: The purpose of this article is to determine the feasibility of using computer-assisted diagnosis (CAD) techniques to automatically identify, localize, and measure body fat tissue from a rapid whole-body MRI examination. CONCLUSION: Whole-body MRI in conjunction with CAD allows a fast, automatic, and accurate approach to body fat measurement and localization and can be a useful alternative to body mass index. Whole-body fat analysis can be achieved in less than 5 min.

Adipose Tissue↗
PubMed1990

Body cathexis and clothed body cathexis: is there a difference?

To investigate the difference between perceptions of the nude body and of the clothed body 29 women were administered the Body Cathexis Scale and a Clothed Body Cathexis Scale. Paired t tests indicated that these working women were significantly more satisfied with their clothed bodies than with their nude bodies.

Adult↗
PubMed2002

Relations of Body Mass Index, body fat, and power of various muscles to sport injuries.

The aim of the present study was to estimate associations of Body Mass Index, body fat, and muscle power on sport injuries. In injured and noninjured athletes during a sport season of four months, the differences in Body Mass Index, the percent body fat, and back, leg, and right- and left-hand muscle strength were examined. The subjects were 329 men and 127 women attending classes in the departments of Physical Training and Sport of Atatürk University (Erzurum, Erzincan, and Ağri in Turkey). Body Mass Index was higher in injured athletes than in noninjured ones, but there was no difference in percent body fat between injured and noninjured athletes. The back and leg muscle power were higher for noninjured athletes than for injured ones. The right- and left-hand power was higher for injured athletes in some sports. Because the back and leg muscles function in control of equilibrium, the power of these muscles may be important for control related to avoidance of sport injuries.

Adipose Tissue↗
PubMed1997

Body measurements and body weights of special-fed Holstein veal calves.

Changes in various body dimensions of special fed veal calves were measured and correlated with body weight (BW) at three specific times during the growth period as contemporaries and over the entire feeding period as noncontemporaries. The calves (n = 826) were weighed and measured for body length, heart girth, wither height, and hip width at 2, 8, and 16 wk after arrival at the veal farms. Each of the four measurements, expressed as ratios to BW, decreased over the feeding period; decline in the ratio of hip width to BW was less than the decreases in the other ratios. Linear models to predict contemporary BW within each age group based on all body measurements were developed; R2 values for models for 2, 8, and 16 wk were 0.72, 0.77, and 0.76, respectively. Within each of the three age classes, a model including linear, quadratic, and cubic terms of heart girth yielded the highest R2 values of any single measurement (0.46, 0.63, and 0.67 for data for 2, 8, and 16 wk, respectively). The addition of heart girth as a second linear measurement to three-term models containing only one other measurement increased the R2 more than did the addition of any other single linear expression, except for the equation based on body length. When all records on all calves were combined and the observations were treated as noncontemporaries, the R2 was 0.97 for a linear model that included all four measurements. However, this R2 was essentially the same as the R2 from a three-term model using only heart girth. The cubic models in descending order of R2 values were heart girth, body length, hip width, and wither height. These results suggest that BW can be predicted accurately in a group of noncontemporary male veal calves ranging from 2 to 16 wk after the start of the feeding period. However, the BW of calves within contemporary groups (2, 8, and 16 wk) cannot be predicted accurately according to R2 values.

Aging↗
PubMed2004

A computer program for measuring body size distortion and body dissatisfaction.

A computer program is described that measures body size distortion and body dissatisfaction. The program is written using Visual Basic development tools and will run on any Windows 98 or more current system. The width of a static digital image of the participant can be manipulated using three separate psychophysical methods. In the method of adjustment, the participant adjusts the image wider or thinner to match his or her perceived size. The participants may also be required to adjust the image to their ideal size, with the discrepancy between perceived and ideal size being used as a measure of body dissatisfaction. In the staircase method, participants see an image that is continuously expanding or contracting. The participants change the direction of the distortion when the image matches their perceived size. In the adaptive probit estimation procedure, participants judge whether a static image is distorted too wide or too thin. Analysis of the responses permits a determination of the point of subjective equality (PSE) and the difference limen (DL) values. The DL reflects the amount of body size distortion necessary for the participant to detect the distortion 50% of the time. The PSE reflects the participant's subjective judgment of his or her body size. These two values are reflective of the sensory and nonsensory components, respectively, that contribute to body size judgments.

Body Image↗
PubMed1976

[Amyotrophic lateral sclerosis with myoclonic bodies (Lafora bodies) (author's transl)].

In the present investigation 2 sporadic cases of amyotrophic lateral sclerosis with the occurrence of myoclonic bodies (Lafora bodies) in the CNS are reported. The patients died after about 14 respectively 8 months lasting disease at the age of 41 and 43, respectively under the clinical signs of an ALS. Morphology, staining qualities, and the distribution of the myoclonic bodies in our cases correspond to the adult form of the myoclonic body disease (type Lundborg). In the literature we found further 6 cases of neurogenic muscle atrophy with the occurrence of myoclonic bodies in the CNS so that one might suppose a syntropy of these two affections. The possible pathophysiological relations of neurogenic muscle atrophy to the occurrence of myoclonic body disease in adults are briefly discussed.

Adult↗
PubMed1991

[Foreign body aspiration in children. The advantages of emergency endoscopy and foreign body removal].

In the last 15 years, 124 children with a history and clinical signs of aspiration have been managed by emergency rigid endoscopy under general anesthesia. In 115 (93%) of them a foreign body could be identified, which was successfully removed by forceps extraction in 114. Only 1 patient required a thoracotomy for removal of a distally located aspirated needle. The remaining 9 patients (7%) had a typical history and clinical signs of an aspiration, but no aspirated foreign body was found on endoscopy. Most of the children (102, or 82%) were admitted within 12 h after aspiration, while 22 (18%) had a history of foreign body aspiration between 2 days and 5 weeks before. Complications occurred in only 3% (3 children) of the 102 who underwent endoscopy within 12 h as against 50% (11 patients) of the 22 children in whom this was delayed. In all cases of foreign body aspiration and endoscopical removal within 12 h, the patients were discharged after a plain chest X-ray the following day. In children with chronic endotracheal foreign bodies, in 80% a second endoscopy after 48 h was indicated, and the mean stay in hospital was extended to 7 days. Emergency rigid tracheobronchoscopy and forceps removal of aspirated foreign bodies under general anesthesia and with meticulous perioperative monitoring is a safe and effective procedure with no mortality. Even in suspected aspiration or chronic bronchopulmonary infections, liberal use of endoscopy is recommended.

Anesthesia, General↗
PubMedDate not supplied

Adult polyglucosan body myopathy with subclinical peripheral neuropathy: case report and review of diseases associated with polyglucosan body accumulation.

A 65-year-old female had polyglucosan body myopathy, usually called "polysaccharide storage myopathy" that presented with increasing distal paresis and only slight weakness of the proximal limb girdle musculature. Muscle biopsy revealed dystrophic changes that could have been mistaken for muscular dystrophy, and the characteristic light as well as electron microscopic features of polyglucosan bodies varying in number at the three sites of muscle biopsies studied (deltoid, quadriceps femoris, and anterior tibial muscle). In addition, there were occasional nonspecific paracristalline mitochondrial inclusions. No abnormal polyglucosan deposits were found in the sural nerve biopsy. Morphometric evaluation of nerve fiber cross sectional areas revealed some degree of demyelination and remyelination, and of nerve fiber degeneration and regeneration. Unlike a series of 10 unselected control sural nerves with Renaut bodies, hypomyelinated nerve fibers were more numerous adjacent to Renaut bodies. This is the first case of polyglucosan body myopathy in which the axon/myelin ratio and the axonal circularity factor in the sural nerve is evaluated and in which a definite lack of polyglucosan bodies or other abnormal glycogen storage products in a peripheral nerve is documented.

Aged↗