I was under the belief that it was the "relative speed" that caused the dilation, not "change of velocity".

Someone mentioned that the space-shuttle clocks ned adjusting after a flight...
I have also 'heard' that the clocks in the GPS-satellites also need adjusting occasionally,
and they are not 'changing velocity' to my eye, but they are 'travelling' faster
than us due to their greater distance from the center of the earth's axis.