Solved Exercises on Measuring Cardiorespiratory Endurance in Grade 2

Master measuring cardiorespiratory endurance: heart rate monitoring, exercise duration, fitness assessment concepts through these 5 detailed exercises with visual aids and educational games.

Cardiorespiratory Endurance Solutions: Exercises 1 to 3
1 Heart Rate Monitoring
Exercise 1
Before exercise, John's heart rate was 72 beats per minute. After running for 5 minutes, his heart rate increased to 120 beats per minute. How much did his heart rate increase?
Definition:

Heart rate: The number of times your heart beats in one minute. Cardiorespiratory endurance is how well your heart and lungs work during exercise.

Measurement method:
  1. Count your pulse for 15 seconds
  2. Multiply by 4 to get beats per minute
  3. Measure before and after exercise
  4. Find the difference between rates
Before exercise
72 bpm
After exercise
120 bpm
Increase
48 bpm
Step 1: Identify the starting heart rate

Before exercise: 72 beats per minute

Step 2: Identify the ending heart rate

After exercise: 120 beats per minute

Step 3: Calculate the increase

120 - 72 = 48 beats per minute

Step 4: Interpret the result

John's heart rate increased by 48 beats per minute

Heart rate increased by 48 beats per minute
Final answer:

John's heart rate increased by 48 beats per minute.

Applied rules:

• Subtraction: Ending rate minus starting rate

• Heart rate monitoring: Count beats per minute

• Cardiovascular response: Heart rate increases with exercise

2 Exercise Duration
Exercise 2
Maria ran for 15 minutes and walked for 10 minutes. Then she jogged for 8 more minutes. How long did she exercise in total?
Definition:

Exercise duration: The total time spent doing physical activity. Longer duration helps improve cardiorespiratory endurance.

Running
15 minutes
Walking
10 minutes
Jogging
8 minutes
Step 1: Identify all exercise periods

Running = 15 minutes, Walking = 10 minutes, Jogging = 8 minutes

Step 2: Add all exercise times

15 + 10 + 8 = 33 minutes

Step 3: Calculate total duration

Maria exercised for 33 minutes total

Step 4: Interpret the result

33 minutes is good for building endurance

Total exercise time: 33 minutes
Final answer:

Maria exercised for 33 minutes in total.

Applied rules:

• Addition: Sum all exercise periods

• Duration calculation: Total time spent exercising

• Endurance building: Longer duration improves fitness

15
Running
10
Walking
8
Jogging
3 Fitness Assessment
Exercise 3
During a fitness test, Tom walked for 12 minutes and covered 1 mile. His heart rate stayed at 100 beats per minute. What is his pace per mile?
Definition:

Pace: How long it takes to cover a certain distance. Good pace indicates better cardiorespiratory fitness.

Distance
1 mile
Time
12 minutes
Pace
12 min/mile
Step 1: Identify the distance covered

Tom walked 1 mile

Step 2: Identify the time taken

Tom took 12 minutes to walk 1 mile

Step 3: Calculate pace

Pace = Time ÷ Distance = 12 minutes ÷ 1 mile = 12 minutes per mile

Step 4: Interpret the result

Tom's pace is 12 minutes per mile with a steady heart rate of 100 bpm

Pace: 12 minutes per mile
Final answer:

Tom's pace is 12 minutes per mile.

Applied rules:

• Pace calculation: Time divided by distance

• Fitness assessment: Lower pace indicates better fitness

• Heart rate monitoring: Steady rate shows good conditioning

12
Minutes
100 BPM
1 Mile
Cardiorespiratory Endurance Measurements
Heart Rate Increase = Post-Exercise HR - Resting HR
Heart Rate Response Formula
Resting Heart Rate
60-100 bpm
Normal range for children
Exercise Heart Rate
140-180 bpm
During moderate exercise
Recovery Time
2-5 minutes
Time to return to resting
Exercise Duration
30+ minutes
Recommended for fitness
Key definitions:

Cardiorespiratory Endurance: Ability of heart, lungs, and muscles to work during prolonged exercise

Heart Rate: Number of heartbeats per minute

Recovery: How quickly heart rate returns to normal after exercise

Measurement methods:
  1. Heart rate monitoring: Count pulse for 15 seconds × 4
  2. Exercise duration: Track total active time
  3. Recovery assessment: Monitor heart rate drop after exercise
  4. Pace calculation: Time per distance unit
Tip 1: Measure resting heart rate in the morning before getting up.
Tip 2: A lower resting heart rate indicates better fitness.
Tip 3: Faster recovery means better cardiovascular fitness.
Memory aid: Higher exercise intensity = higher heart rate
Healthy range: 60-100 bpm at rest for children
Cardiorespiratory Endurance Solutions: Exercises 4 to 5
4 Recovery Rate
Exercise 4
After exercising, Lisa's heart rate was 130 bpm. One minute later it dropped to 110 bpm. How much did her heart rate decrease in one minute?
Definition:

Recovery rate: How quickly the heart rate decreases after exercise stops. Faster recovery indicates better cardiovascular fitness.

Initial HR
130 bpm
After 1 min
110 bpm
Decrease
20 bpm
Step 1: Identify the initial heart rate

After exercise: 130 beats per minute

Step 2: Identify the heart rate after recovery

One minute later: 110 beats per minute

Step 3: Calculate the decrease

130 - 110 = 20 beats per minute

Step 4: Interpret the result

Lisa's heart rate decreased by 20 bpm in one minute

Heart rate decreased by 20 beats per minute
Final answer:

Lisa's heart rate decreased by 20 beats per minute in one minute.

Applied rules:

• Subtraction: Starting rate minus ending rate

• Recovery assessment: Faster decrease indicates better fitness

• Time measurement: Track changes over specific intervals

60s
5 Activity Comparison
Exercise 5
Alex walked for 20 minutes and then ran for 15 minutes. How much longer did he walk than run?
Definition:

Activity comparison: Comparing different exercise durations to understand endurance patterns.

Walking
20 minutes
Running
15 minutes
Difference
5 minutes
Step 1: Identify walking time

Alex walked for 20 minutes

Step 2: Identify running time

Alex ran for 15 minutes

Step 3: Calculate the difference

20 - 15 = 5 minutes

Step 4: State the comparison

Alex walked 5 minutes longer than he ran

Alex walked 5 minutes longer than he ran
Final answer:

Alex walked 5 minutes longer than he ran.

Applied rules:

• Subtraction: Longer duration minus shorter duration

• Time comparison: Compare different activity durations

• Endurance patterns: Track various exercise types

Walking
20 min
Running
15 min
Cardiorespiratory Endurance Concepts
Cardiorespiratory Endurance = Heart Rate Response + Exercise Duration + Recovery Rate
Endurance Components
Key definitions:

Cardiorespiratory Endurance: The ability of your heart and lungs to supply oxygen during sustained physical activity

Heart Rate: Number of heartbeats per minute (bpm)

Recovery Rate: How quickly your heart rate returns to normal after exercise

Measurement methods:
  1. Heart rate monitoring: Count pulse for 15 seconds and multiply by 4
  2. Exercise duration: Track total time spent in physical activity
  3. Recovery assessment: Monitor heart rate drop after exercise
  4. Activity tracking: Record different types of exercise
Tip 1: A healthy resting heart rate for children is 60-100 bpm.
Tip 2: During exercise, heart rate increases significantly.
Tip 3: Better fitness means faster heart rate recovery.
Tip 4: Regular exercise improves cardiorespiratory endurance.
Memory aid: Higher intensity = higher heart rate
Healthy practice: Exercise for at least 30 minutes daily
Key Points to Remember

Core Concepts:

Cardiorespiratory Endurance: How well your heart and lungs work together during exercise. It's measured by heart rate, exercise duration, and recovery rate.

Key Measurements:

  • Resting heart rate: Your heart rate when calm
  • Exercise heart rate: Your heart rate during physical activity
  • Recovery rate: How quickly your heart rate drops after exercise
  • Exercise duration: Total time spent being active

Healthy Ranges:

• Resting heart rate: 60-100 beats per minute

• Exercise heart rate: 140-180 beats per minute

• Recovery: Heart rate should drop by 20+ bpm within 1 minute

• Duration: At least 30 minutes of activity daily

Benefits:

• Stronger heart muscle

• Better lung capacity

• More energy

• Improved stamina

Questions & Answers

Question: How can I safely measure heart rate in young children during physical education?

Answer: Safe heart rate measurement for children:

  • Proper technique: Use index and middle fingers on neck or wrist
  • Count for 15 seconds: Multiply by 4 to get beats per minute
  • Age-appropriate: Explain the process before starting
  • Supervision: Always monitor during measurement

Normal ranges for children are 60-100 bpm at rest.

Question: How can I help my child develop better cardiorespiratory endurance at home?

Answer: Home activities for endurance development:

  • Regular exercise: 30 minutes of activity daily
  • Fun activities: Running, jumping, dancing, playing
  • Gradual increase: Build up duration slowly
  • Family involvement: Exercise together as a family

Consistency is more important than intensity for young children.

Question: What are age-appropriate cardiorespiratory tests for 2nd graders?

Answer: Safe tests for 2nd graders:

  • Walk/run tests: Walk/jog for set time or distance
  • Heart rate monitoring: Simple pulse counting
  • Recovery tests: Heart rate drop after exercise
  • Fun activities: Dance, games, movement activities

Focus on fun and participation rather than performance.