Patent ID: 7740589

Claim:
A method for training control of a test person in sports, comprising the steps of: radiating light into body tissue of the test person from outside the body of the test person into the body of the test person at a thigh of the test person which is highly stressed; measuring light intensity reflected in venous blood in the body tissue of the thigh of the test person; using an evaluator with an evaluation circuit, deriving a temporally oscillating measurement quantity from the measured light intensity which temporally oscillates corresponding to a heart rate of the test person where each heart rate induced oscillation is substantially the same as the previous oscillation at least during a rest state and an aerobic state of the test person; determining a plurality of temporally successive minima in a time curve of the measurement quantity at a bottom of each said heart rate induced oscillation; defining the rest state of the test person when said plurality of temporally successive minima remain substantially constant at a first value, determining the aerobic state for the test person when said plurality of temporally successive minima remain substantially constant at a second value which is less than said first value, and determining an anaerobic state for said test person when said temporally successive minima are not constant but are falling with time so that decreasing values result which are below said second value; analyzing said plurality of temporally successive minima; generating via the analysis of the plurality of temporally successive minima a quantity characterizing oxygen saturation in the venous blood as a performance rating from which a current metabolic state of the test person can be read out; and displaying the generated performance rating.