Suunto5 interval training and Description in Suunto App

[brnfox]

Hello,
I tested the intervals on my Suunto 5 for the first time, and after synchro with the Suunto App, I have this description for my activity:
3 x 3.0km @ 24.0 km/h 2’29 min/km Moy 156 (Maxi 160) bpm / 8Mini 44s Moy 143 bpm;

I understand the beginning, but what is: 8Mini 44s Moy 143 bpm ?
Thanks for your help.
Bruno