10k training - how fast can i get in 5 months?

[sirchimp]

Ok, 140 makes sense. But the second part of my question involes heart rate drift. IE the way the heart rate goes up over time if i continue to run at the same pace.

Should I:

a) Start at a pace that sees my pulse at 140, then as the pulse rises, SLOW DOWN so my pulse stays at 140? This will see me start out quick, and then slow down slower and slower until the end of the run.

b) maintain a pace such that my heart rate is say...130 at the beginning, but ends at 150, so my average was 140?

c) maintain a pace such that my heart rate ENDS at 140 after the 90 minutes?

I hope that is clear what I'm asking...

By way of example, I ran 7km today at an easy 11kph steady (except for the first km which had a bit of wlaking and rampup to 11kph midway):

Tread Mill - 1%
km | time | avg HR | max HR
1 | 6:03.0 | 117 | 133
2 | 5:26.8 | 132 | 135
3 | 5:26.7 | 136 | 140
4 | 5:26.9 | 138 | 140
5 | 5:27.8 | 140 | 142
6 | 5:27.2 | 142 | 145
7 | 5:26.2 | 145 | 148
38:44.6

My AVERAGE heart rate for the time period was 135. I started lower than that, and ended higher. If I was targeting 135, did i get it right? Or did i start too slow and end too fast? Or...?

Thanks! Been wondering about this for awhile. As a note, my run today felt good...probably the lowest perceived effort 'easy' run at 11kph...

Regards