Physiological measures were taken in trained swimmers performing a pace-controlled 400 m breaststroke swim under conditions of being shaved and unshaved. Two groups were compared. Results showed that the physiological effort of swimming decreased in the shaved condition. Also: 1.the distance per stroke increased; 2.oxygen uptake decreased; 3.blood lactate decreased; and 4.a velocity decay test from a push-off was improved. Implication: Shaving before major competitions provides a measurable physiological advantage for swimmers primarily through the reduction of active drag.
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