Hotter Than….

Hell in an oven right about now!

As a result, I was feeling my annual need to say something about how essential it is to adjust run paces to the heat, humidity, and overall misery of the great outdoors.

Every year twitter starts buzzing (twitting??) and the questioning starts on Daily Mile…

“Its so damn hot….How much should I slow down?”

Which really means,

“How much should I struggle to maintain my normal pace and hope I don’t keel over and die?”

It’s a given that we MUST dial things down a notch or two in the summer and if you’re the type that freaks (who me???) when the Garmin trends higher and higher as the temperature does the same,

Well, these two charts are for you…..

from RunOnTexas.com

Another way to look at it below from jeffgalloway.com

This was from long ago before he became the run/walk advocate he is today so this is geared more towards straight out runners….

Estimated temperature at finish – adjustment – 8min/mi becomes:

55-60 degrees – 1% – 8:05
60-65 degrees – 3% – 8:15
65-70 degrees – 5% – 8:25
70-75 degrees – 7% – 8:35
75-80 degrees – 12% – 8:58
80-85 degrees – 20% – 9:35
Above 85 degrees – Forget it… run for fun

You can check out the long version here: http://wp.me/p1lOIa-lt  if you’re so inclined, but the information isn’t new.

Keep in mind, these examples only factor the temperature. They are not adding time for long runs or recovery runs.

However, depending on where you’re reading this, some “experts” would argue that ALL summer running should be “easy” and that it’s a good time to put down the GPS for a few months.

Easier said than done, I know….I KNOW!!!

I tend to follow the 1st flow chart because heat and humidity combined tend to be our biggest issue down here in South Mississippi.

This morning, at 5:30am, our low was 88F and the humidity was 92%. Now when the sun rises the humidity drops a bit to the 70% range, but the temperature rises to the 95F range….

It usually only takes a week or two, struggling through June workouts, for me to realize why I consider the summer my “off-season.”

At the same time, it’s always good to keep things in perspective and realize it could always be worse!!

OUCH!

Y’all stay safe out there!

Run Happy, My Friends!

How Much is Enough?

News Flash Folks: It’s hot out there.

And it’s not just hot, it’s humid.

The two combined, make running about as pleasant as yard work. It’s simply another chore that has to get done!

But does it really HAVE to be this way?

I got to thinking and doing a little research.

We all KNOW we should slow down when the temperature rises, but by how much?

First, some facts:

  1. Upwards of 70% of the energy produced is released as heat instead of energy for the muscles.
  2. Sweating is the primary mechanism for heat dissipation.
  3. It is the evaporation of this sweat that cools the body (less is more in terms of clothing in the summer).
  4. Humidity decreases the evaporation of perspiration and in turn, inhibits the body’s ability to cool itself adequately (which is why 120F in Arizona is a more comfortable “dry” heat than the 95F” wet” heat of South Mississippi).
  5. Heart rate increases about 10bpm when temperatures are between 75-90F.
  6. Heart rate increases an additional 10bpm when humidity is between 50-90%.
  7. Performance decreases by approximately 20% when temperatures are above 80%.
  8. Runner’s in the summer produce about 1liter water/500kcal burned OR 3.3-4.4 lbs water/hr which is the same as 1/2 gallon of water lost per hour.  HYDRATE! HYDRATE! HYDRATE!

So, how slow is slow?

Check out this chart below. This doesn’t take into account any additional time for “long runs” or recovery work. This is simply the heat and humidity.

 from RunOnTexas.com

Just a few more months and we’ll all be bitching about how freakin’ cold it is….

I can’t wait!!!

Run Happy, My Friends!

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