Exercise, Play, and Sleep - First Grade Science
To grow into a strong, healthy adult, your body requires more than just nutritious food and clean water; it also needs daily physical activity and high-quality sleep. Exercise and rest are two sides of the same coin. When you run, climb, ride your bicycle, and dance, you strengthen your muscles, heart, and bones. When you climb into bed and fall into a peaceful sleep, your brain organizes memories and your body repairs cells and produces growth hormones. Balancing exercise and rest keeps you energized and happy.
What Happens When You Exercise?
When you play actively on the playground or participate in sports, your body immediately responds with several observable physical changes.
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| WHAT HAPPENS DURING EXERCISE |
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| - FASTER HEARTBEAT: Heart pumps harder to send blood to muscles. |
| - HEAVIER BREATHING: Lungs breathe deeply to take in extra oxygen. |
| - WARMTH & SWEAT: Muscles generate heat; sweat cools skin down. |
| - BRAIN BOOST: Brain releases endorphins that make you feel happy! |
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The Heart: A Muscle That Loves Work
Your heart is a muscle, and just like your leg and arm muscles, it gets stronger when you exercise! During vigorous exercise, your active muscles need extra oxygen and nutrients. To deliver them, your heart beats faster, and you breathe more rapidly. Over time, regular exercise makes your heart stronger and more efficient.
Types of Physical Activity
Exercise does not have to feel like hard work; playing tag, jumping rope, swimming, dancing to music, riding a scooter, and hiking through a park are all wonderful ways to exercise. Experts recommend that kids get at least sixty minutes of active play every single day!
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| THREE TYPES OF FITNESS |
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| AEROBIC (Cardio) FLEXIBILITY STRENGTH |
| Makes heart and lungs Helps muscles and Builds firm, power- |
| work hard; builds joints bend, reach, ful muscles and dense |
| endurance. and stretch smoothly. bones. |
| Examples: Running, Examples: Gymnastics, Examples: Climbing |
| skipping, swimming. yoga, touching toes. bars, monkey bars. |
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The Science of Rest and Sleep
After a busy day of learning and exercising, your body needs time to recharge. Sleep is not just resting your eyes; it is an active, vital biological state where your body undergoes essential maintenance.
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| WHAT YOUR BODY DOES WHILE SLEEPING |
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| GROWTH HORMONE Your pituitary gland releases growth hormones |
| that make your bones longer and muscles grow. |
| CELL REPAIR Damaged cells from scrapes and exercise rebuild.|
| BRAIN FILING The brain sorts through the day's experiences, |
| saving important memories and clearing junk. |
| IMMUNE DEFENSE White blood cells multiply to fight infections. |
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How Much Sleep Do You Need?
Children in first grade need between 10 and 12 hours of restful sleep every single night! When you do not get enough sleep, you may feel grumpy, find it hard to pay attention in school, have slower reaction times, and catch colds more easily.
Healthy Bedtime Habits
Creating a calm bedtime routine helps your brain transition from an active day into deep, restful sleep.
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| GREAT BEDTIME SLEEP HABITS |
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| STICK TO A SCHEDULE Go to bed and wake up at the same time daily. |
| SCREEN-FREE TIME Turn off TVs, tablets, and phones 1 hr before.|
| CALM ACTIVITIES Take a warm bath, read a book, listen to soft |
| music, or practice slow deep breathing. |
| DARK AND COOL ROOM Keep the bedroom dark, quiet, and comfortable.|
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The blue light emitted from television, tablet, and smartphone screens tricks your brain into thinking it is still daytime by blocking the release of melatonin, your body's natural sleep hormone. Turning screens off before bed allows your body to produce melatonin naturally and fall asleep quickly.
Chapter Review Exercises
Question 1: What are three changes you can observe in your own body when you run fast during a game of tag?
Question 2: Why is the heart considered a muscle that benefits from regular exercise?
Question 3: List three critical tasks that your body performs while you are fast asleep at night.
Question 4: How does looking at bright tablet or phone screens right before bed affect your ability to fall asleep?
Solutions and Explanations
Solution 1: Three observable changes during running are your heart beats much faster, your breathing becomes deeper and more rapid, and your skin warms up and begins sweating to cool down.
Solution 2: The heart is a muscular organ that pumps blood. Regular exercise forces the heart muscle to contract more powerfully and efficiently, strengthening it over time and improving your overall cardiovascular endurance.
Solution 3: While sleeping, your body releases growth hormones to help you grow taller, repairs tired muscles and damaged cells, strengthens the immune system to fight germs, and organizes memories in the brain.
Solution 4: Bright electronic screens emit blue light that tricks the brain into thinking it is still daytime, suppressing the production of melatonin (the sleep hormone) and making it difficult to relax and fall asleep.