I think that any uphill is going to have some impact as the extra energy required for uphill running isn't compensated by an equivalent downhill gradient.
Basically, you don’t get “back” as much as you put “in” to a hill!
I recently ran a 10k series in a village called Ilmington. After a relatively first 1k, the next 2.5kms were uphill with some sections of steep gradient. In the five races, I still never made it it to the top without walking some of it. Even though there was a 3km section downhill, I never recovered the time lost from the uphill.
Every percent gradient of incline (going uphill) will slow you by 12-15 seconds per mile, and every percent gradient of decline (going downhill) will aid you by 8 seconds per mile.
I recently ran a 10k series in a village called Ilmington. After a relatively first 1k, the next 2.5kms were uphill with some sections of steep gradient. In the five races, I still never made it it to the top without walking some of it. Even though there was a 3km section downhill, I never recovered the time lost from the uphill.




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