It’s pretty well-known that too much cardio can interfere with strength and size gains. This study found that interval sprint training did not interfere with gains while still offering cardiovascular benefits.
Balabinis, C. P., Psarakis, C. H., Moukas, M., Vassiliou, M. P., & Behrakis, P. K. (2003). Early phase changes by concurrent endurance and strength training. Journal of Strength and Conditioning Research, 17(2), 393-401.
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