Running Index is a simple and convenient way to determine running performance. Running Index takes speed and heart rate information and squeezes it into one validated and comprehensible number that reflects running performance. It is a powerful tool to follow changes in endurance fitness and to predict future performance. Values can be compared against others in a reference group.Running Index is dependent on running conditions and thus the result should be interpreted as an estimate of running performance under similar conditions. In this paper, the physiological and technological background of Running Index are presented.

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