Researchers found that Dahl R rats exhibit efficient spatial navigation, while Dahl S rats display poor spatial navigation. Analysis of F1 male progeny implicated the X chromosome in the impairment observed in Dahl S rats.
A new study found that exercise mode, rather than volume, influences hormone levels and changes in testosterone, DHEAS, and cortisol. Resistance-trained males had higher basal testosterone levels, while endurance-trained males had lower testosterone levels compared to sedentary subjects.
A study found that alcohol exposure during prenatal and postnatal stages may program offspring for insulin resistance and glucose intolerance. Offspring exposed to ethanol showed increased glycemia, decreased insulin sensitivity, and higher triglyceride levels.
A Canadian study found that children with higher aerobic fitness reported fewer 'sick' days, while those with high body fat experienced more URTIs. Regular physical activity and lower body fat were also linked to better immune function in children.
Research reveals that children with narrow retropalatal air spaces have more severe SDB due to significantly larger tonsil and soft palate CSAs. The study found a significant correlation between OAHI and oropharyngeal volume, indicating the importance of pharyngeal geometry and soft tissue anatomy in determining SDB severity.
Aging impacts bone geometry, vertebral structural properties, and the mechanical effects of caloric restriction. It also alters cerebral artery tone, intracellular Ca2+ concentration, and endothelial-dependent vasodilation, potentially leading to age-related changes in skeletal muscle blood flow.
A new study shows that moderate exercise reduces susceptibility to upper respiratory tract infection by enhancing immune function. Soluble oat fiber â-glucan also boosts immunity, and combining it with exercise may have additional benefits.
Researchers found five SNPs associated with differences in BMI, waist size, and skinfold totals, highlighting the interplay between genetics, SES, and family history of cardiovascular disease. The study suggests that a combination of genetic makeup and behavioral environment is responsible for obesity development
Researchers found that adolescents with impaired stress-induced pressure natriuresis showed increased urinary creatine levels and higher blood pressure after stress, indicating excessive kidney workload. This response pattern may lead to early development of renal disease.
Researchers found increased COX-2 protein expression and changes in TXA2 and PGE2 levels in the Obese Zucker rat, which led to kidney damage. The study suggests that COX-2 inhibitors may be beneficial for preventing renal damage in obesity-related type II diabetes.
A new study finds that stress-induced salt sensitivity and increased blood pressure load contribute to racial differences in hypertension prevalence. The research suggests that these factors may help explain the higher incidence of hypertension among African-Americans, a long-standing public health concern.
Researchers found that high-fat diet causes downregulation of CYP4A and CYP2C23 enzymes in renal tubules, leading to increased sodium reabsorption and elevated blood pressure. This study highlights the importance of eicosanoid synthesis in regulating renal function and blood pressure.
A new animal study found that PKC may contribute to reduced erectile response in diabetic-obese Zucker rats. The researchers observed increased protein expression of PKC isozymes and Rho-kinase b in the corpus cavernosum, suggesting a role for PKC in vasoconstriction and reduced erectile function.
A new study has identified specific molecules whose genetic regulation is altered during aging, contributing to vascular remodeling. The study found that inflammatory-associated adhesion molecules ICAM-1 and VCAM-1 had significantly increased expression at older ages.
A new study found significant gray matter loss in the insular cortex and basal ganglia of advanced heart failure patients. The insular cortex was affected on both sides, with greater loss on the right side, while basal ganglia damage was also observed.
Researchers found that dissatisfied shift workers experienced lower morning testosterone levels, while satisfied workers had no significant differences in cortisol or prolactin. The study suggests that low testosterone levels may contribute to shift intolerance due to disturbed sleep and increased need for recovery.
A new study has found that intense gymnastics training during childhood and adolescence does not have significant effects on resting testosterone or sexual maturation in male gymnasts. The research, published in the Journal of Applied Physiology, recruited 21 elite gymnasts and 24 age-matched boys to compare their physical and pubertal...
Researchers found significant racial and sex differences in nasal contribution to breathing during exercise, with African-Americans having a greater nasal contribution than Caucasians. Women had significantly less physical work capacity and breathing efficiency compared to men.
A study by Taiwanese researchers found that swimming exercises can improve bone density and mechanical properties in growing rats, similar to weight-bearing exercise. However, the benefits of non-weight-bearing exercises like swimming on long bone biomechanical properties were not significant.
The American Physiological Society (APS) has awarded over $33,000 to its 2003 undergraduate research fellows. The fellowships provide stipends and travel funds to support the research of talented young scientists.
A new study suggests that the area where carcinogens settle may play a key role in developing lung cancer. The research found that cells located at carinal ridges can receive massive doses of toxic particulate matter, potentially leading to impaired mucociliary clearance and increased risk of neoplastic lesions.
A study examined the effects of bright display screens on melatonin levels, core temperature, heart rate, and sleepiness during VDT tasks at night. The results showed that salivary melatonin concentration increased in all conditions, with lower levels during exciting-BD tasks compared to exciting-DD tasks.
Researchers have developed a canine model of nasal congestion and allergic rhinitis that closely resembles human conditions. The study found that histamine-induced nasal congestion in dogs was alleviated by α-adrenergic agonists, paving the way for testing new treatments.
Researchers from the University of Virginia measured microvascular diameters in response to static magnetic field exposure in skeletal muscle. The study found a restorative, biphasic effect on microvascular tone acting to normalize tone following exposure, with primary mediation by smaller resistance arterioles.
Research suggests that mother-infant bed sharing is associated with higher infant heart rates, particularly in non-REM sleep stages. The study found a significant increase in heart rate during bed sharing nights, with smaller increases seen during REM sleep.
A new study investigates the likelihood that physical activity level regulation with aging is controlled, in part, by genetic factors. The research found significant differences between strains of female mice in physical activity measurements, suggesting a genetic influence on age-related changes in daily physical activity levels.
Researchers found that simvastatin, a cholesterol-lowering statin, prevents diet-induced arterial hypertension and metabolic insulin resistance in mice by stimulating nitric oxide bioavailability. This effect appears to be related to stimulation of vascular NO availability.
Researchers discovered 13 novel nucleotide variations in the coding region of the SCN5A gene, which is responsible for the initial upstroke of the heart's action potential. The study suggests that genetic variation may play a role in the ethnic difference in disease susceptibility among Japanese patients.
A new study reveals that consuming caffeine and ephedra prior to exercise alters the cardiovascular system by increasing blood pressure and hypersensitive response. The combination also heightens systolic blood pressure before exercise, indicating greater demands on the heart.
A study found that patients with Chronic Fatigue Syndrome (CFS) who have reduced cardiac output and blood volume may exhibit decreased left ventricular function. The researchers used nuclear ventriculography to assess the heart's functioning in CFS patients and healthy controls during exercise and postural stress.
Teggreen, a green tea polyphenols product, improves lipid and glucose metabolisms in obese rats by enhancing insulin sensitivity and balancing fat deposit and burning. The study reveals significant benefits of Tegreen treatment, including decreased fasting blood glucose and serum triglycerides.
A new study has established genetic associations in hepatitis C, finding correlations between the CD4 and IL-1B genes and disease activity. The research suggests a possible role of intrahepatic CD4 T cells in hepatic injury and immune response to HCV infection.
Researchers found that prenatal ethanol exposure led to partial central diabetes insipidus in young adult rats, characterized by increased water consumption and reduced vasopressin release. This finding may provide insight into the pathogenesis of diabetes insipidus and offer potential treatment targets for this debilitating disorder.
A new study examines the metabolic and cardiovascular effects of consuming caffeine with naringin, a flavonoid found in grapefruit. The results show that caffeine significantly increases resting metabolic rate, but adding naringin does not further enhance energy expenditure or affect blood levels of caffeine.
A unique program, ENERGY, has been established to reduce childhood obesity and type 2 diabetes among elementary school students. The program incorporates science education enrichment activities to promote healthy eating and active living.
Researchers found hibernating mammals, like ground squirrels, have superior tolerance to extended cold storage. This could lead to new methods for preserving human organs, reducing damage from transportation and storage.
A study published by the American Physiological Society reveals a strong correlation between plantar pressure and skin perfusion distribution in diabetic patients. The researchers found that areas with high plantar pressures, such as the metatarsal heads, had significantly lower skin perfusion values.
Researchers found that supplementation with whey isolate and creatine increased muscle fiber size and strength gains, particularly in fast-twitch fibers. The study suggests that dietary strategies enhancing resistance training outcomes have significant implications for athletes and individuals with muscle-wasting conditions.
A new study found that current low-dose oral contraceptives significantly increase plasma concentrations of C-reactive protein (CRP), an inflammatory biomarker associated with cardiovascular disease. CRP levels were two times higher among OC users than non-users, regardless of diet assignment or phase of the menstrual cycle.
A new research study suggests that grape seed extract can blunt salt-sensitive hypertension in postmenopausal women, similar to the effects of plant estrogens or 17ß-estradiol. The study found that adding grape seed extract to a high-salt diet reduced blood pressure in estrogen-depleted female rats.
Researchers found B-vitamins to be effective in treating various painful conditions, including neuropathic pain. The study suggests that B1, B6, and B12 inhibit chemical- and heat-induced pain and activate the cGMP-PKG signaling pathway, which contributes to their analgesic effects.
A new study explores brain activity during explicit mental operations of finger representations using objective confirmation of performance. The researchers found that brain areas associated with motor execution and imagery were equally activated, suggesting a functional gradation from more 'executive' to more 'imaginative' areas.
Researchers discovered a corollary discharge inhibition mechanism that enables crickets to hear external sounds during song production, preventing desensitization. This allows males to defend their territory and respond to noisy predators.
A meta-analysis of 48 studies found that creatine and HMB supplements effectively increased lean tissue gain with resistance training. These supplements doubled lean gain over the placebo group, suggesting independent mechanisms of action.
Researchers found that skills learned with the dominant arm generalize to the non-dominant arm, but only in extrinsic coordinates, and do not rely on inter-hemispheric communication via the corpus callosum. This challenges current models of brain learning and motor control.
A new study confirms that Braille is crucial for visual cortex development in blind individuals, regardless of age of blindness. The research used fMRI to compare early and late blind subjects, finding similar activation patterns in the visual cortex.
The American Physiological Society recognized 12 prominent researchers with its 2003 Distinguished Lectureships, honoring their groundbreaking contributions to physiology. The awardees delivered lectures on April 11-14, 2003, at the Experimental Biology meeting.
A new animal study reveals regional differences in brain activity during sleep, contradicting previous theories on sleep deprivation. The study found that different parts of the brain regulate sleep intensity, with frontal cortex involvement and hemispheric asymmetries playing a crucial role.
Researchers found increased vascular resistance in paralyzed legs of humans with long-term spinal cord injuries. However, a short period of training led to a marked decrease in vascular resistance, suggesting that deconditioning is the primary cause of the increase in vascular resistance.
Researchers discovered that jaw stiffness significantly impacts speech production, causing variability in motion as sounds are made. The study measured jaw stiffness and its effect on kinematic variability during speech production, revealing a relationship between the two.