The heart rate (HR) at the lactate threshold was determined on a treadmill in 59 children with an average age of 11.8 years. 45 minutes later, they had to go through a vita maxima test on a bicycle ergometer. The load was increased stepwise by 10 Watt/min. During the tests HR was registered continually and stored every 5 seconds. In 52 children the characteristic break point was evident; in 7 children no break point could be found - in 2 children, because they had stopped the exercise before reaching the lactate threshold, and in 5 children because their HR increased linearly from the beginning until the end of the load application. HR at the break point correlated very strongly with HR at the lactate threshold (r = 0.99). Therefore the authors are of the opinion that the introduced modification of the Conconi test can substitute the invasive lactate threshold determination in children.

Child↗

PubMed1979

[High voltage power station to study the influence of the DC-field with superimposed AC-field on humans (author's transl)].

Due to the great progress in electrical engineering man is exposed to electric fields in a high degree. However, the effect of the electric field has not been definitely cleared up till now. The following parameters are of decisive importance: Field intensity- Frequency-Shape of curve-Boundary conditions. As scientific investigations can only be reproduced and accepted when the experimental conditions are clearly defined, a station meeting these requirements has been developed. It consists of Testing room: Electric screen damping higher than 80 dB-Magnetic screen damping higher than 45 dB-large, cased ceiling electrode. Control room: Same as testing room, but no screening. High voltage generator: a) DC-Voltage 0-20 kV ripple & noise less than 0.01%; b) Alternating voltage 0-300 Vss frequency 5 Hz-50 kHz; c) combination of a) and b).

Clinical Trials as Topic↗