Calculating swim speeds

The New York Times charted speed ranks during the women’s 4×100 freestyle relay. My favorite part is how they got the data, which wasn’t available, so they estimated through photos and timestamps:

The Times annotated a sequence of several hundred photographs to determine the speed of each athlete throughout the race. Speeds were calculated by combining the positions of the athletes with timestamp information from the images.

If the data you’re looking for isn’t readily available, it might just be a few steps away.

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In Case You Missed It: Top 10 Posts From 2017

 

In honor of the New Year, we are rounding up the blogs that were most viewed by you, our readers, in 2017.

  1. America’s Hidden Health Crisis: Hope for Those Who Suffer from ME/CFS
    Public Health Matters recognized the 25th anniversary of International Awareness Day for Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) and Fibromyalgia. Between 825,000 and 2.5 million Americans are estimated to have ME/CFS, yet this debilitating illness remains largely invisible to most Americans.


  2. John Snow: A Legacy of Disease Detectives
    In 1854, John Snow was the first to use maps and records to track the spread of a disease back to its source. Today, his ideas provide the foundation for how we find and stop disease all over the world. Public Health Matters highlighted the CDC Epidemic Intelligence Service in honor of the birthday of the father of epidemiology and the first true disease detective.


  3. Tips to Protect Yourself from Norovirus
    Every year, 19 to 21 million people get sick with diarrhea and vomiting caused by norovirus. Public Health Matters shared five steps you could take to help protect yourself and others from this virus that can lead to dehydration or more serious illness, especially in young children and older adults.


  4. Why Diarrhea & Swimming Don’t Mix
    While sunburn and drowning might be the health risks that first come to mind when you think about swimming, diarrhea is another culprit. Outbreaks of diarrheal illness linked to swimming are on the rise. Public Health Matters shared five important facts about diarrhea-causing germs at aquatic venues and how to protect yourself and loved ones during Healthy and Safe Swimming Week 2017.


  5. Keep your pets safe in an emergency: 5 things to know
    Many pet owners are unsure of what to do with their pets if they are faced with extreme weather or a natural disaster. June was National Pet Preparedness Month and Public Health Matters highlighted five things you can do to keep your pets safe during and after an emergency.


  6. Get a Flu Shot to Protect Your Heart and Your Health
    People with certain long-term medical conditions, such as heart disease, are at high risk of developing serious complications from flu. Public Health Matters discussed the complications of flu and the important steps you can take to protect yourself and those around you including getting a flu vaccine.


  7. Predicting Community Resilience and Recovery After a Disaster
    After a disaster, the number of people with psychological trauma exceeds the number of people with physical injury by as much as 40 to 1, but there is much more research and emergency response focus on the physical effects of a disaster rather than the psychosocial effects. Public Health Matters interviewed a professor from Johns Hopkins Bloomberg School of Public Health about their innovative model and index to measure resilience in the United States.


  8. Safety Tips Every Contact Lens Wearer Should Know
    Forty-five million people in the United States who wear contact lenses to correct your vision. Eye infections related to improper contact lens wear and care are serious and can lead to long-lasting damage, but they are often preventable. Public Health Matters discussed the science behind some of the important contact lens wear and care recommendations in observance of Contact Lens Health Week.


  9. Preparing for College Life: A Healthy Guide
    Public Health Matters invited our David J. Sencer CDC Museum Intern from the Walker School to guest write a post with tips for fellow graduating high school seniors to prepare to head off to college.


  10. Rural America in Crisis: The Changing Opioid Overdose Epidemic
    In America, 15 out of 100 people live in a rural area. The rate of drug overdose deaths in rural areas has surpassed rates in urban areas, and it is a huge public health concern. Public Health Matters explored how rural areas are different when it comes to drug use and drug overdose deaths, including opioids and CDC’s response to this epidemic.

 

We want to hear from you!

The New Year is not just about reflecting on the past, and as we look ahead to 2018 we want to know what topics you would like to see on Public Health Matters. Please feel free to leave a comment below or send us an email so we can make sure that we are sharing content that is useful and interesting to you.

Don’t forget to subscribe to our newsletter, follow @CDCemergency, or visit us on Facebook so you are the first to hear about new blogs.

Why Diarrhea & Swimming Don’t Mix

 

Kids by PoolThe summer swim season is here, and millions of Americans will be flocking to local pools for fun in the sun and exercise. However, swimming, like any form of exercise, does not come without health risks. The good news is that we can all take a few simple but effective steps to help keep ourselves and other swimmers we know healthy and safe.

While sunburn and drowning might be the health risks that first come to mind when you think about swimming, diarrhea is another culprit. Outbreaks of diarrheal illness linked to swimming are on the rise. And this Healthy and Safe Swimming Week, we want to make sure you know these important facts about diarrhea-causing germs at aquatic venues, like swimming pools and water playgrounds, and how to protect yourself and loved ones.

  1. When swimmers have diarrheal incidents in the water, they release diarrhea-causing germs into the water. For example, a swimmer infected with the parasite Cryptosporidium can release 10–100 million infectious germs into the water. Swallowing 10 or fewer Cryptosporidium germs can make someone sick.
  2. Don't leave your mark at the pool this summerSome diarrhea-causing germs can survive in properly treated water for days. Standard levels of chlorine and other disinfectants can kill most germs in swimming pools within minutes. However, Cryptosporidium has a tough outer shell and can survive for up to 10 days in properly treated water. Outbreaks of diarrhea linked to pools or water playgrounds and caused by the parasite Cryptosporidium have doubled since 2014.
  3. Swim diapers won’t keep diarrhea out of a pool. Using swim diapers might give parents a false sense of security when it comes to containing diarrhea. Research has shown that swim diapers might hold in some solid feces but these diapers only delay diarrhea-causing germs, like Cryptosporidium, from leaking into the water by a few minutes. Swim diapers do not keep these germs from contaminating the water.
  4. Don’t swallow the water you swim in. Swallowing just a small amount of water with diarrhea germs in it can make you sick for up to 3 weeks.
  5. Don’t swim or let your kids swim if sick with diarrhea. We all share the water we swim in. Do your part to help keep loved ones healthy by not getting in the water if you or your children have diarrhea.

CDC’s Michele Hlavsa is a nurse and the chief of CDC’s Healthy Swimming Program. As a parent, it is important for her to know how to protect her children from not only diarrhea, but all types of germs and injuries linked to swimming. Michele encourages swimmers to follow a few easy and effective steps each time they swim in a pool or get in a water playground this summer and year-round.

 

Healthy and Safe Swimming Week 2016

Healthy and Safe Swimming Week 2016

Summer is here! For many, it is time to hit the pool or take your children on a summer outing to the waterpark. Swimming is a great way to exercise, have fun and relax while spending time with family and friends. However, like many activities, it is not risk-free.

Thousands of U.S. public pools and other aquatic venues are closed each year due to serious health and safety violations. Inspections of public aquatic venues are critical to prevent illness, drowning and pool chemical–associated injuries, including poisoning or burns.

This year, during Healthy and Safe Swimming Week, CDC is encouraging swimmers to protect themselves and their loved ones from getting sick or hurt while enjoying the pool, hot tub/spa, or water playground. CDC’s Michele Hlavsa is a nurse and the chief of CDC’s Healthy Swimming Program. As a mom, it is important for her to know how to keep her child healthy and safe in water.  Michele points out, “We check out inspection results before eating out, why not check out inspection results before swimming?” Swimmers and parents of young swimmers, like Michele, can take steps to protect their health and safety and that of their families while having fun in the water this summer.

Check the latest inspection results for public pools, hot tubs/spas, water playgroundsDo your own inspection before you swim

Before jumping into any type of treated water this summer, you can do your own simple and quick inspection.

  • Use a test strip (available at most superstores or pool-supply stores) to determine if the water’s pH and free chlorine or bromine concentration are correct.[1]
  • Make sure the drain at the bottom of the deep end is visible.
    • Clear water allows lifeguards and other swimmers to see swimmers underwater who might need help.
  • Check that drain covers at the bottom appear to be secured and in good repair.
    • Swimmers can get trapped underwater by a loose or broken drain cover.
  • Confirm that a lifeguard is on duty at public pools. If not, check whether safety equipment, such as a rescue ring with rope or pole, is available.

Bring any problems that you find during your inspection to the attention of the person in charge of the facility so they can be fixed before you get in the water. If the problems are not addressed, you can report the issues to your state or local health department.  You can also download an inspection checklist on the Healthy Swimming website.

Think Healthy. Swim Healthy. Be Healthy!

Recreational water illnesses can be caused by swallowing germs or coming into contact with – or breathing in mists or sprays of – contaminated water in swimming pools, hot tubs/spas, water playgrounds, lakes, rivers, or oceans.  These illnesses result in a wide variety of infections, including gastrointestinal, skin, ear, respiratory, eye, neurologic, and wound infections.

Staying safe in and around the water is important, too. Don’t forget sun safety and drowning prevention. Learning swimming skills like floating, wearing life vests and, swimming under the supervision of parents, caregivers, or life guards who know CPR can prevent drowning.

Before jumping into the pool this summer, don’t forget to:What's in your cannonball?

Keep the pee, poop, sweat, blood, and dirt out of the water.

  • Stay out of the water if you have diarrhea.
  • Stay out of the water if you have an open wound (for example, from surgery or a piercing) that is not covered with a waterproof bandage.
  • Shower before you get in the water – Rinsing off in the shower for just 1 minute removes most of the dirt or anything else on your body.

Protect yourself and others!

  • Protect against sunburn by using sunscreen with at least SPF 15 that blocks both UVA and UVB rays.
  • Use well-fitting Coast Guard approved life jackets for flotation assistance rather than foam or air-filled toys.

Once you are in the water…

  • Don’t pee or poop in the water.
  • Don’t swallow the water.
  • Keep an eye on children at all times. Kids can drown in seconds and in silence.

Every hour—everyone out!

  • Take kids on bathroom breaks.
  • Check diapers, and change them in a bathroom or diaper-changing area–not poolside–to keep germs away from the pool.
  • Reapply sunscreen.
  • Drink plenty of fluids.
  • Dry ears thoroughly with a towel after swimming.

Learn more about how to stay healthy and while swimming, visit CDC’s Healthy Swimming Website and/or Drowning Prevention Website.

[1] CDC recommends pH 7.2–7.8. The free chlorine concentration should be at least 1 ppm in pools and at least 3 ppm in hot tubs/spas. The free bromine concentration should be at least 3 ppm in pools and at least 4 ppm in hot tubs/spas. Use test strips to test pH and free chlorine or bromine concentration. Most superstores, hardware stores, and pool-supply stores sell test strips. Follow the manufacturer’s directions.

Happy Fins: Plesiosaurs Flapped like Penguins

plesiosaur_striking-crop-690x320One of the most infuriating things about being a paleontologist is being able to study some of the coolest organisms that have ever inhabited the Earth, yet never being able to see one in life.

Drowning Can Be Subtle

I suspect that people at our pool judge me for being that parent that’s too distracted watching his kids. It makes me an even worse conversationalist than usual. The social norm is that the kids play and the adults socialize, after all, there is an admirably diligent lifeguard. I am a quadcopter drone of a parent at the pool and beach for two reasons. One, I like playing with my kids (they are more interesting than you – I have data). Two, drowning doesn’t look like drowning:

The Instinctive Drowning Response—so named by Francesco A. Pia, Ph.D., is what people do to avoid actual or perceived suffocation in the water. And it does not look like most people expect. There is very little splashing, no waving, and no yelling or calls for help of any kind. – Mario Vittone

 


Filed under: This Mortal Coil Tagged: drowning, Linkonomicon, parenting, pools, safety, swimming