Final answer:
During training, as blood viscosity increases, peripheral resistance in the athlete will also increase. This can result in reduced blood flow to the muscles, decreased oxygen delivery, and impaired performance.
Step-by-step explanation:
During training, as blood viscosity increases, peripheral resistance in the athlete will also increase. This is because increased blood viscosity leads to a decrease in blood flow, and hence an increase in resistance to blood flow. Peripheral resistance refers to the resistance encountered by blood flow as it passes through the blood vessels in the peripheral (or outer) parts of the body.
An increase in peripheral resistance can have several effects on the athlete, such as reduced blood flow to the muscles, decreased oxygen delivery, and impaired performance.
For example, if the average radii of the athlete's blood vessels do not increase to compensate for the increased peripheral resistance, blood flow to the muscles may be restricted, resulting in reduced oxygen and nutrient delivery. This can lead to fatigue, decreased endurance, and impaired athletic performance.