it's not as simple as some articles make it out to be. Different duration interest rates can go up as different percentages. For example, in the 2004 interest rate hikes, the short duration funds got hurt the most. Short term interest rates went up, while longer term interest rates hardly moved at all. Intermediate and long duration bond funds saw little pain. This suprised a lot of people.
So the question really is - how will the Fed raising short term rates affect the yield curve? Will it stay they same slope, but just move to higher rates across all durations - in which case longer duration funds will be hurt more than short.
Or will the curve "flatten" - the short end moving up while the intermediate/long doesn't move much. In this case most of the pain is felt at the short end. Curves flatten when investors think that raising short-term interest rates will reduce future inflation and/or hurt economic recovery.
I suspect with super low short term rates - 2.5% or lower - which are extremely unusual historically, but have occurred twice in the 2000s - there will be some flattening.
Audrey