Nice shots, but I notice they are pretty significantly underexposed. This is common in shooting ice hockey since the camera wants to expose that big expanse of white ice as 18% gray level. Dialing in about +1.5 EV will typically get you close. You can also try center-weighted metering.
Properly exposed, you would need a considerably higher ISO to get the shutter speeds you got -- ISO 1600 or so, I'm guessing. The D7000 should still do a decent job at that ISO.