Question

read the scenario.
maya, a 10th-grade-student athlete, is planning a new training routine to enhance her performance on the school soccer team. understanding the importance of working out within her optimal heart rate zone, maya calculates her target heart rate (thr). as a 15-year-old, she calculates her maximum heart rate (mhr) by subtracting her age from 220, resulting in an mhr of 205 beats per minute (bpm).
what is mayas target heart rate (thr) zone, and what does it suggest about her workout intensity?
○ 100 to 150 bpm, suggesting she is not pushing hard enough in her training
○ 92.25 to 164 bpm, indicating a healthy and efficient cardiovascular fitness level
○ 150 to 200 bpm, indicating an intensity beyond her level for cardiovascular training
○ 102.5 to 174.25 bpm, indicating a safe and effective level for cardiovascular fitness

Explanation:

Step1: Recall THR formula

The target heart rate (THR) zone is typically calculated as \( \text{THR} = \text{MHR} \times \text{intensity range} \). The common intensity range for cardiovascular fitness is 50% to 85% of MHR. Maya's MHR is 205 bpm.

Step2: Calculate lower bound of THR

Lower bound: \( 205 \times 0.5 = 102.5 \) bpm.

Step3: Calculate upper bound of THR

Upper bound: \( 205 \times 0.85 = 174.25 \) bpm.

Step4: Analyze the range

The range 102.5 to 174.25 bpm is within the 50 - 85% of MHR, which is a safe and effective level for cardiovascular fitness.

Answer:

D. 102.5 to 174.25 bpm, indicating a safe and effective level for cardiovascular fitness