997cc047_ng_Zones___Guide___Wattbike_UK__Physiological_Adaptations
[Training Zone] Zone 5 [Purpose] Sustain a high percentage of maximal aerobic power [Race fitness] Improved time trialling ability and resistance to short-term fatigue [Physiological Adaptations] 
Develops cardiovascular system and VO2max, improves anaerobic energy production and speeds turnover of waste products
Heart Rate and Power Training Zones - Guide - Wattbike UK
Physiological Adaptations