Let me just come out and say it right off the bat... I set a 10k PR that day (by 21 seconds) when I thought I had no business coming close to one. Some of you might recall my injured hip flexor that kept me from running the first 2 months of the year. Well, the Easter SunRun came a little over a month after I started getting my running legs back to pre-injury form, and I still have a ways to go.
In fact, the week of the SunRun I did a test where I kept my heart rate at 175 bpm for about 8 miles and compared that to an identical run I did last fall. The results indicated my pace was currently 30 seconds slower. So, how did I manage a PR when I wasn't in top form? My only explanation is the weather, just ask those who ran Boston this month.
As far as 10k's go, I really only do the same one every year, and it occurs more towards Summer. Temps for all my previous 10k's have been in the 70º to 80º range. Temperatures for the Easter SunRun this year were in the mid 50s with cloudy skies. There have been plenty of articles published about why and how heat affects runners, so I won't go into much detail about the science here. My hope is that my recent experience and the statistics I've recorded can serve as a good real world example of how varying temperatures can affect you.
Now I will concede that I made some decent progress between my previous 10k's and my injury, so an argument could be made that by taking "two steps forward and one step back," I still end up 1 step ahead. However, I have one more point to make.
One week prior to the SunRun, I ran 2 legs in a relay which were on average 0.7 miles shorter than a 10k. The temperatures for the relay started out in the 70s, and ended in the mid 80s. It was a struggle for me to maintain an 8:00 pace. In comparison, a week later at the SunRun 10k, I averaged a 7:04 pace. Notice in my charts below the 10k is the longer race yet my pace is faster while my heart rate is lower.
Here's my Garmin Data from my last leg in the 84º Brew to Brew Relay 04-01-12:
Split | Time | Distance | Avg HR | Max HR |
1 | 08:08.3 | 1 | 188 | 197 |
2 | 07:49.7 | 1 | 193 | 196 |
3 | 07:54.9 | 1 | 197 | 200 |
4 | 08:05.1 | 1 | 199 | 202 |
5 | 05:36.0 | 0.73 | 202 | 203 |
Summary | 37:33.9 | 4.73 | 195.8 | 203 |
Here's my Garmin Data from the 55º SunRun 04-07-12:
Split | Time | Distance | Avg HR | Max HR |
1 | 06:55.0 | 1 | 174 | 186 |
2 | 07:09.0 | 1 | 186 | 190 |
3 | 07:16.4 | 1 | 190 | 195 |
4 | 07:09.4 | 1 | 191 | 195 |
5 | 07:06.1 | 1 | 193 | 198 |
6 | 06:55.4 | 1 | 197 | 200 |
7 | 01:24.0 | 0.23 | 200 | 203 |
Summary | 43:55.0 | 6.23 | 189 | 203 |
2Slow4Boston Easter SunRun 10k | |
---|---|
Chip Time | 43:54 (PR) |
Overall Place | 68/689 |
Age Group | 6/37 |
Average Pace | 7:04 |
I'll leave you with a few pics from the SunRun:
I wonder if the guy in red looks as awkward in motion as he does frozen in time. |
Headed down home stretch. HR = 203 |
All smiles post race while pitching a different kind of tent. |