@Dion DePaoli By definition, in an inflationary environment money loses its value. When this happens, it takes more money to purchase hard goods than it did before. Therefore, the true value of cash I have in accounts as well as money that I am owed (loans) goes down. It's a very clear relationship.
Yes, when the value of collateral appreciates, the equity position of existing debt secured by that collateral improves. This could have a small impact on the price a given loan would sell for in the secondary market.
So what do you think the Fed will do in the event inflation increases significantly above their 2%target? Who knows, but my guess would be that part of the strategy would include raising of interest rates, like they did in the early 80's. The federal funds effective rate was over 18% at times in that time period. What happens to the value of your 8% rate loan when new debt can be issued in the high double digits? Take a guess... You definitely would want to be a borrower at 8% rather than a lender in that kind of environment.