Bonus Problem 4: (20 pt) A 25 year old forestry worker has a VO₂ /heart rate regression equation of y a bx Where y is the oxygen consumption (liters O₂/min) x

is the heart rate (beats/min), a 1.42 b 0.025 1. The worker's heart rate is monitored while felling trees and is found to be 150 beats/min. Use the regression equation to estimate the worker's oxygen consumption while performing this task. 2. Use the equation in question 5 to estimate the worker's maximum heart rate. 3. Estimate the worker's VO₂ max from his estimated maximum heart rate using the regression equation above. 4. Calculate the relative workload by expressing the oxygen consumption while working as a percentage of VO₂ max. 5. Refer to the following Table to estimate the time to exhaustion. Please estimate as a value not a value range. Table: Time to exhaustion when working continuously at a percentage of VO₂ max Relative work demand (VO₂ max) Maximum work time 10% 20% 30% 40% 50% 60% 70% 80% 90% >12h >12h 11h 5:30h 2:40h 1:20h 40min 18min 9min