Affect of hard running before a time trial?

squirrel55 wrote:

I just went for a mile time trial and aborted at 600m as I went out too hard - not flat out 600m pace, just too hard for a mile.

Went again a few minutes later and got about what I was expecting, matching my current VDOT. This is a 6 min mile by the way as I'm nearly 50. The first half was easy, the second was harder than I was expecting, breathing pretty hard 2/2.

How would the first run have affected the time I eventually did, roughly?

it actually probably had a slight benefit more than a negative influence. You essentially "primed the pump"

Probably you could have run a little faster if you didn't do the 600m assuming that you had a solid warmup

brickrunnin wrote:

squirrel55 wrote:

I just went for a mile time trial and aborted at 600m as I went out too hard - not flat out 600m pace, just too hard for a mile.

Went again a few minutes later and got about what I was expecting, matching my current VDOT. This is a 6 min mile by the way as I'm nearly 50. The first half was easy, the second was harder than I was expecting, breathing pretty hard 2/2.

How would the first run have affected the time I eventually did, roughly?

it actually probably had a slight benefit more than a negative influence. You essentially "primed the pump"

If a benefit, we'd see more elites warming up this way. Perhaps a 150 - 200 meters at that pace (a la Webb) but not 600m.

How many minutes between the effort? If you recovered 5-10 minutes, it probably had little impact.

Thanks gents, bit of a dud question really but useful replies, especially the thing about doing a couple of fairly hard 150-200s. I'm going to try that out, it feels like it makes sense.