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Isometric strength of the elbow flexors and the knee extensors was measured by a strain‐gauge dynamometer constructed according to Darcus (1953). The accuracy of this dynamometer was found to be ± 1–3 per cent. Seventeen young female and seventeen young male subjects underwent a training period of from 20 to 36 days. Their training constituted the performance of one of the following forms of exercise: 1 daily maximum isometric contraction, 10 daily maximum isometric contractions, 10 daily eccentric muscular contractions or 15 min of daily heavy dynamic work (riding a bicycle ergometer). The effect on the isometric strength and endurance of the trained muscle groups was measured and compared to a control group of 7 females and 6 males, who received no specific training, It was found that 1 daily maximum isometric contraction had no effect on the isometric strength of the muscles, 10 daily maximum isometric contractions had a tendency to increase the isometric strength of the muscles, while 10 daily maximum eccentric contractions had no measurable effect on isometric muscle strength. Heavy dynamic work increased the isometric strength of the muscles by 12 per cent in the females and 23 per cent in the males. There was no measurable effect on endurance to sustained isometric contractions consequent to any of the training programs. Training of muscles on one side did not modify the strength of the contralateral muscle groups.