Laursen, P. B., Blanchard, M. A., & Jenkins, D. G. (2002). Acute high-intensity interval training improves Tvent and peak power output in highly trained males. Canadian Journal of Applied Physiology, 27, 336-348.

Four high-intensity interval training (HIT) sessions were performed over two weeks. Ss were highly trained male cyclists (N = 14) in full training. Ss were involved in a HIT group and a control group. High-intensity training consisted of 20 x 60s at peak power output with two minutes of active recovery between each effort. Control Ss maintained regular training.

VO2peak did not change for either group. The HIT group improved significantly more than controls in the first and second ventilatory thresholds (Tvent1 and Tvent2), and peak power output.

Implication. High-intensity interval training improved peak power output in trained cyclists. That performance improvement was superimposed on the base-training adaptation that existed. Increasing the intensity of training is an avenue for quick improvements in performance specific power (which some would erroneously call strength).

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