CPR First Aid

Effects of Dehydration on Heart Rate

Effects of Dehydration on Heart Rate

You might be surprised to learn that dehydration can significantly affect your heart rate. In actuality, even slight dehydration might increase heart rate. This is because, in order to maintain blood flow and fluid balance, the body’s natural response to dehydration is to raise blood pressure and heart rate. In this article, we’ll talk about the consequences of dehydration on heart rate as well as ways to avoid it.

What is a Normal Heart Rate?

Your heart works harder if you’re dehydrated. Dehydration can increase the strain on your heart as the muscle tries to compensate. Your blood volume (the amount of blood flowing through your body) and blood pressure reduces. Your heart beats more quickly (tachycardia) as a result, raising your heart rate and giving you palpitations. Additionally, more sodium is retained in your blood, making it more difficult for it to flow through your body.

According to Mayo Clinic, a normal resting heart rate for adults ranges from 60 to 100 beats per minute. Generally, a lower heart rate at rest implies more efficient heart function and better cardiovascular fitness. For example, a well-trained athlete might have a normal resting heart rate closer to 40 beats per minute. 

To measure your heart rate, simply check your pulse. Place your index and middle fingers on your neck to the side of your windpipe (carotid pulse). To check your pulse at your wrist, place two fingers between the bone and the tendon over your radial artery — which is located on the thumb side of your wrist (radial pulse).

When you feel your pulse, count the number of beats in 15 seconds. Multiply this number by four to calculate your beats per minute.

Keep in mind that many factors can influence heart rate, including:

  • Age
  • Fitness and activity levels
  • Being a smoker
  • Having cardiovascular disease, high cholesterol or diabetes
  • Air temperature
  • Body position (standing up or lying down, for example)
  • Emotions
  • Body size
  • Medications
  • Although there’s a wide range of normal, an unusually high or low heart rate may indicate an underlying problem. Consult your doctor if your resting heart rate is consistently above 100 beats a minute (tachycardia) or if you’re not a trained athlete and your resting heart rate is below 60 beats a minute (bradycardia) — especially if you have other signs or symptoms, such as fainting, dizziness or shortness of breath.

Importance of Hydration to our Hearts

According to the Australian Government National Health and Medical Research Council, water makes up between 50% and 80% of the human body, making it the single largest component, and it is important to almost all biological processes. Your heart depends on proper hydration.

Blood is continuously pumped by your heart throughout your body. It pumps around 7,600 gallons daily while beating an average of 72 times per minute. Your heart works harder and can more easily pump blood to your muscles when you’re properly hydrated. Your muscles can then function more effectively as a result. On the other hand, when you are dehydrated, your heart beats faster and works harder than usual. This is to compensate for the blood flow needed in the body.

Recommended Daily Water Intake

The  Australian Government National Health and Medical Research Council recommend consumption of the water for adults. The body must retain a minimal amount to maintain a tolerable solute load for the kidneys. Excluding perspiration, the normal turnover of water is approximately 4% of total body weight in adults. In a 70 kg adult, this is equivalent to 2,500-3,000 mL/day.

When You’re More Active, Should You Drink Extra Water?

You lose bodily fluid while also removing heat from the body when sweat evaporates from your skin. You must consume fluids when exercising to replace the fluids you lose through perspiration. By doing this, you can lower your chance of developing heat exhaustion while maintaining regular bodily functions and performance levels.

Ways to Drink More Water

  1. Be aware of your recommended water intake.
  2. Carry a water bottle with you or leave one at your desk/workspace.
  3. Set a goal daily.
  4. You can use an app to track your water intake.
  5. Add freshly cut fruit to your water jug or bottle for some flavour.
  6. Set reminders on your phone to have a glass of water.
  7. Keep an easily accessible jug of water in your fridge.
  8. Sip throughout the day.
  9. Drink a glass of water after waking up and before bed.
  10. Drink a glass of water for at least 30 minutes before eating.
  11. Switch one of your tea/coffee breaks to water instead.

First Aid Courses in Brisbane

Risks of dehydration, hypertension and hypotension can be prevented. Early detection of signs and symptoms will help you manage it. If you are interested in enrolling in a first aid course in Brisbane, contact CPR First Aid for more information.

CPR First aid courses and training are open to all since emergency situations such as complications caused by dehydration can happen to all ages, anywhere in Australia. NRT LogoHLTAID010 Provide an emergency first aid response is one of our popular courses. Contact us anytime for your queries.

About CPR First Aid

RTO No. 21903: CPR First Aid was founded in 2007. We specialise in providing first aid training in CPR, asthma and anaphylaxis for a range of workplaces including childcare, schools and other industries in NSW, VIC, SA, WA and QLD. We are a Registered Training Organisation with the Australian Skills Quality Authority (No 21903). Our courses and Units are VET-accredited for workplaces in Australia.

Conclusion

Dehydration can significantly affect your heart rate. Even slight dehydration might increase heart rate. This is because, in order to maintain blood flow and fluid balance, the body’s natural response to dehydration is to raise blood pressure and heart rate. The consequences of dehydration on the heart increase the strain on your heart as the muscle tries to compensate. Prevention of dehydration is very important. Drink your water at least between 2.1 to 2.6 litres for adults and between 1 to 1.6 litres for children every day. When dehydration occurs, it is best to perform effectively First Aid. Hope you learned the first aid tips for dehydration. Learning is fun, you can join us in our CPR First Aid Australia Training for more first aid tips! 

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