The following publication may be of interest to you. They compared HIIT and MIT by matching for total work in humans. EDGE, J., D. BISHOP, C. GOODMAN, and B. DAWSON. Effects of High- and Moderate-Intensity Training on Metabolism and Repeated Sprints. Med. Sci. Sports Exerc., Vol. 37, No. 11, pp. 1975–1982, 2005.