Kubukeli, Z. N., St. Clair Gibson, A., Collins, M., Noakes, T. D., & Dennis, S. C. (2000). The effects of high intensity interval training, taper, and 6 weeks of habitual training on 100-km time trial performance in endurance trained cyclists. Medicine and Science in Sports and Exercise, 32(5), Supplement abstract 538.

Well-trained male cyclists (N = 6) performed two 100-km time trials before and after high intensity interval training (two added training stimuli sessions over three weeks), on three occasions one week apart in taper, and six weeks after taper.

Average time-trial speed and power improved after the high-intensity training and improved further in taper, with peak performances after two weeks. Time trial performances after six weeks were similar to those before the commencement of high intensity work. PFK, CS, and HAD activities as well as muscle buffering capacity did not change significantly during the study.

Performance changes largely were not associated with metabolic adaptations. Neuromuscular and muscular adaptations might be more responsible for performance improvements.

Implication. The benefits of high intensity training and taper largely stem from factors other than metabolic changes.

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