The effects of long-term spaceflight (90-180 days) on the contractile and elastic characteristics of the human plantarflexor muscles were studied in 14 cosmonauts before and 2-3 days after landing. Despite countermeasures practiced aboard, spaceflight was found to induce a decrease in maximal isometric torque (17%), whereas an index of maximal shortening velocity was found to increase (31%). In...

The effects of plan asymmetry on the earthquake response of one­ story systems are identified by comparing the dynamic response of an asymmetric­ plan system and the corresponding symmetric-plan system for a wide range of system parameters-uncoupled lateral vibration period, uncoupled torsional-to-lat­ eral frequency ratio, stiffness eccentricity, and yield factor. Elastic as weI! as in­ elasti...

Assessment of neck lymph nodes is essential in patients with head and neck cancers for predicting the patient's prognosis and selecting the appropriate treatment. Ultrasonography is a useful imaging tool in the assessment of neck lymph nodes. Greyscale ultrasonography assesses the size, distribution, and internal architecture of lymph nodes. Doppler ultrasonography evaluates the intranodal vasc...

objective this study aimed at investigating seasonal variation, clinical symptoms, and cerebrospinal fluid (csf) changes in patients with aseptic meningitis admitted in mofid hospital between 1995 and 1996. materials & methods a total of 63 children with aseptic meningitis were enrolled in the study. their age, gender, season of the disease, etiology, clinical symptoms, csf changes, and treatme...

BACKGROUND Shear wave elastography is a relatively new method of quantitative measurement of tissue elasticity. Assuming that malignant lesions are stiffer than benign ones, elastography may provide supplementary information for their discrimination. However, potential confounding factors impacting tissue stiffness should be investigated first. AIMS The objective of this study was to measure ...

The Hybrid III 50th percentile male anthropomorphic test device (ATD) is the most widely used human impact testing surrogate and has historically been used in automotive or military testing. More recently, this ATD is finding use in applications evaluating athletic helmet protectivity, quantifying head impact dosage and estimating injury risk. But ATD head-neck response has not been quantified ...

acute fever, occipital pain and neck stiffness. His medical history included pseudogout of the right knee, which was confirmed by the presence of chondrocalcinosis on a radiograph and calcium pyrophosphate dihydrate crystals in fluid obtained by arthrocentesis. His mentation was normal, and he had limited cervical motion in all directions. His erythrocyte sedimentation rate was 100 mm/h, and hi...

Currently, it is unknown whether changing prosthetic limb stiffness affects the total limb stiffness and influences the shock absorption of an individual with transtibial amputation. The hypotheses tested within this study are that a decrease in longitudinal prosthetic stiffness will produce (1) a reduced total limb stiffness, and (2) reduced magnitude of peak impact forces and increased time d...