Original research:
Effects of a Seven Day Overload-Period of High-Intensity Training on Performance and Physiology of Competitive Cyclists
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4270748/
Note:
The cyclists [Mean age: 33±10 years] were well-trained with a minimum of two years competitive experience at grade A or B…immediately prior (2 weeks) to the start of the study cyclists were completing individual self or coach-determined training regimes consisting of a minimum of ten hours (∼300-km) mixed intensity training per week. [Classic TR demographic?!]
Both HIT groups successfully completed 100% of the prescribed training regime over the allotted 7-day period.
TR discussion:
Happy pedalling! 