The relationship between muscle deoxygenation and activation was examined in three different muscles of the quadriceps during cycling ramp exercise. Seven young male adults (24 ± 3 yr; mean ± SD) pedaled at 60 rpm to exhaustion, with a work rate (WR) increase of 20 W/min. Pulmonary oxygen uptake was measured breath-by-breath, while muscle deoxygenation (HHb) and activity were measured by time-r...

BACKGROUND Endurance training improves cardiopulmonary fitness in maintenance haemodialysis (MHD). Because many MHD patients are profoundly deconditioned and exhibit significant muscle weakness, endurance training may also improve muscle strength and physical performance in these patients. This study assessed this possibility. METHODS Twelve MHD patients performed incremental and constant wor...

A previous analysis of World Records (WR) has revealed the potential limits of human physiology through athletes' personal commitment. The impact of political factors on sports has only been studied through Olympic medals and results. Here we studied 2876 WR from 63 nations in four summer disciplines. We propose three new indicators and show the impact of historical, geographical and economical...

Student wastage in higher education is a problem of great importance in our society. The time has come to try to start a service to give specialised help for redeployment in continued education or in suitable employment that carries further training prospects. This would be not only a humane social service, but a real component of the educational and economic system. At present, wastage in the ...

In 1991, a long term UBV -photometry campaign of four Wolf-Rayet stars was started using the 60 cm telescope of the National Astronomical Observatory Rozhen, Bulgaria. Here we report on our observational results and discuss the light variations. The star WR137 was observed during 1991 1998. No indications of eclipses were found, though random light variations with small amplitudes exist, which ...

Arm and leg vascular responsiveness to comparable shear stimuli during isolated dynamic exercise has not been assessed in humans. Consequently, six young cyclists performed incremental, intermittent handgrip exercise (arm) and knee-extensor exercise (leg) from 5 to 60% of maximal work rate (WR). Ultrasound Doppler measurements were taken in the brachial artery (BA), common femoral artery (CFA),...

objectives: multidrug resistance (mdr), which may be due to the over expression of p-glycoprotein (pgp) and/or mrp, is a major problem in neoadjuvant chemotherapy of osteosarcoma. the aim of this study was to investigate the role of tc-99m mibi scan for predicting the response to pre-operative chemotherapy. materials and methods: twenty-five patients (12 males and 13 females, aged between 8 and...

The spectrum of the Wolf-Rayet (WR) star WR 63 contains spectral lines two different O stars that show regular radial velocity (RV) variations with amplitudes ~160 and ~225 km/s on a ~4.03 d period. light-curve shows narrow eclipses are 0.2 mag deep same period as RV changes. On other hand, our data no significant for lines. Those findings compatible being triple system composed non-interacting...

An experiment of factorial design was conducted to quantify variation in the components of reproductive wastage in Merino ewes following artificial insemination (AI) in either January, March or May. Semen from 6 individual rams was used in either fresh or deep frozen form, the latter providing a ram "control" to identify variation in wastage as of either paternal or maternal origin. Results sho...