Question

1. Carole is an active 55-year old, who is classified as being in an average fitness category, with a resting HR of 80 bpm.  Calculate her target heart rate range for an intensity of 60-85% of predicted max heart rate using the Karvonen heart rate reserve method.  (2 points)

2. Marvin wants to lose weight and is exercising at a pedal rate of 60 rpms at 60% of his VO2max on a Monark Cycle. What would the resistance on his cycle be? His Max VO2 is 42 ml/kg/min and he weighs 200 lb.

(3 points)

Answer 1

Answer:

Based on the given information:

Part I:

• Carole - Resting HR = 80 bpm
• Carole age is 55 years
• Target heart rate range for an intensity of 60-85% of predicted max heart rate
• The formulae used as per Karvonen heart rate reserve method is:
• Target Heart Rate = [(max HR − resting HR) × %Intensity] + resting HR
• Maximum heart rate can be determined using a simple formula: 220 - age = 220 - 55 = 165
• For intensity 60%, Target Heart Rate = [(165 −80) × 60%] + 80 = 131 bpm
• For intensity 85%, Target Heart Rate = [(165 −80) × 85%] + 80 = 152 bpm
• Therefore, Low HR is 131 bpm and High HR is 152 bpm

Part II:

• Pedal rate of 60 rpms at 60% of his VO2max on a Monark Cycle.
• Max VO2 is 42 ml/kg/min and
• Marvin Weight = 200 lb = 90.7 Kg
• Resistance on his cycle be?
• One revolution of the flywheel is = distance of 6.0 meters
• VO2 Cycling = (1.8 x WR)/BW + 3.5 + 3.5  
• 42 = (1.8*WR)/90.7 + 3.5 + 3.5
• WR = (42 - 3.5 - 3.5)*90.7 / 1.8 = 1763.6 kgm
• Monark Cycle Work Rate: Resistance X Revs/min x 6m/rev = Resistance * 60 * 6 = Resistance *360
• WR = 1763.6 = Resistance *360
• Therefore, Resistance = 1763.6 / 360 = 4.9 Kg