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Abstract
The effect of exercise on arm and hand steadiness was studied in two experiments. Unsteadiness following exercise was 35, 53, and 181% greater than pre-pedaling performance for the treatments in which heart rate (HR) was raised to 100, 130, and 160 bpm respectively. The recovery pattern of steadiness following 6 min. of cycling exercise (mean HR 169 bpm) was measured; immediately following the exercise unsteadiness was 143% greater than during pre-pedaling performance and decreased as more time elapsed between the exercise and the steadiness task. When measured 240 sec. after the exercise, unsteadiness was still 28% greater than in pre-exercise performance. Steadiness is markedly affected by preliminary exercise which raises the activation level, with unsteadiness being greatest at the highest levels of activation.