The muscle fibers of M. rectus abdominis from 3 sportsmen (Weight-lifting, Boxing and Body-building) were examined histologically and compared with the mean of 22 human control subjects. Following results were obtained.
1. Compared with the M, rectus abdominis of control subjects, the sportsmen's rectus abdominis muscle area was about 4 times the cross-sectional area of muscle belly and the number of muscle fibers per sq, mm, were 1/3 that of the control specimens. The total number and mean size of sportsmen muscle fibers corresponded to the respective maxima of the controls, and the muscle fiber density in sportsmen corresponded to the minimum control value.
2. Comparing the myofibrous organization of 3 specimens, the muscle of the boxer was largest in cross-sectional area, in frequency of muscle fibers with large diameter, and in volume of interstitial connective tissue. It was the smallest of the 3 specimens in the number of muscle fibers per sq. mm. We found that the muscle of the weight-lifter was intermediate in these four categories.

No abstract available.

OBJECTIVESThe ingestion of pesticides in the daily diet is assumed to be the main modality of pesticide exposure for most people. A widely used class of pesticides in agricultural or residential settings is pyrethroid. We have examined the relationship between the intake frequency of selected items of vegetables and fruits and urinary metabolites of pyrethroid pesticides in a healthy general population.

METHODSA total of 535 residents (184 men and 351 women) who attended a healthcare checkup program conducted in a rural area of Hokkaido, Japan, in August 2005 provided informed consent for their spot urine samples to be used for the determination of 3-phenoxybenzoic acid (3-PBA) levels. They also completed a self-administered questionnaire regarding the intake frequency of 12 food items. The concentrations of creatinine-corrected 3-PBA were predicted by the intake frequency of each item, using analysis-of-covariance models to adjust for age, sex, body mass index, and drinking and smoking status.

RESULTSBoth a significant association between the 3-PBA concentration and the frequency of tomato consumption and a significant positive linear trend was found in female subjects. In contrast, no such association was found in the male subjects.

CONCLUSIONSThe frequency of tomato consumption was confirmed to strongly predict the urinary pyrethroid metabolite levels in the general population-presumably because tomatoes are most often consumed raw and unpeeled (more so than all other vegetables and fruits analyzed in the current study). However, it should be noted that the 3-PBA levels, even among those subjects with the highest consumption of tomatoes, were far below the levels of toxicological significance, although the health consequences from long-term low-level exposure to pyrethroid requires further exploration.

OBJECTIVESWe determined the relationship between abdominal circumference and the concentration of nitric oxide (NO), an endothelial cell product known to play an important role in the regulation of vascular tone and thrombocyte activations.

METHODSSubjects were 177 men and 339 women aged 40 or over who were free from a history of diabetes or malignancy. Analysis of covariance was applied to examine the gender-specific and smoking-status-specific associations of abdominal fat volume measured as waist circumference, waist-hip ratio, and waist-to-stature ratio, with serum NO level represented by the concentration of NO metabolites (NOx; nitrate plus nitrite).

RESULTSAlthough men showed no statistical association between abdominal fat accumulation and NOx concentration, abdominal adiposity seemed to inversely affect the serum NOx concentration of never- and current-smoking women.

CONCLUSIONOur results suggest that a reduction in NO bioactivity occurs with abdominal fat accumulation in women. The underlying biological mechanism might involve adipocytokines secreted from visceral fat, but is yet to be elucidated.

The extent to which students’ experiences are enriched by incorporating anthropology into clinical education in undergraduate medical education has not been adequately examined. The authors have collaborated to integrate anthropological fieldwork with clinical education in a clinical clerkship course. Reflection on the course has highlighted that the principles of anthropological fieldwork have stimulated changes in the roles of both faculty and students, as well as their interpersonal dynamics. These changes have the potential to promote an ‘education emerged from serendipity in the field’ approach, which tends to be undervalued in the current clinical training driven by the prevailing outcome-based medical education paradigm.

OBJECTIVESThe aim of this study was to determine whether the serum nitrite plus nitrate (NO( x )) level correlates with biomarkers that are known components of the metabolic syndrome (MetS).

METHODSSerum NO( x ) levels were measured using a commercial kit in 608 Japanese men and women between the ages of 39 and 85 years. Multivariate adjustments for age, smoking status, alcohol consumption and exercise were made in the analysis of covariance (ANCOVA). The components of the metabolic syndrome were defined based on the following criteria: body mass index (BMI) >/=25.0 kg/m(2), glycated hemoglobin (HbA1c) >/=5.6%, systolic blood pressure >/=130 mmHg or diastolic blood pressure >/=85 mmHg, high-density lipoprotein-cholesterol (HDL-C) /=1.69 mmol/l.

RESULTSThe logarithmically transformed age-adjusted serum NO( x ) (lnNO( x )) value was significantly higher in the low HDL-C group (1.76 +/- 0.05 mumol/l; p < 0.05) than MetS component groups (1.65 +/- 0.01 mumol/l) in men, but no difference was found in women. The means of serum lnNO( x ) after multivariate adjustment were 1.64, 1.65, 1.64, 1.66, and 1.81 mumol/l for 0, 1, 2, 3, and 4-5 MetS components for all subjects, respectively. The results of ANCOVA confirmed that the serum lnNO( x ) level was significantly correlated with the clustering of MetS components in both men and women (p < 0.0001 for trend).

CONCLUSIONOur results suggest that an increase in the clustering of MetS components was associated with the increase in serum NO levels in our general population.