Repeating abbreviation in body text if already in chapter/section title This is a follow-on question to Is it reasonable to use full word and abbreviation in parenthesis in a chapter title?

One answer to that question indicates that in some cases, using an abbreviation in a chapter/section title is acceptable, other times not.

In the cases when it is acceptable, should you redefine the abbreviation before its first use in the chapter/section?  Here is an example:




  Chapter 4 - Results of Differential Scanning Calorimetry (DSC)
  
  The apparent crystallographic phase transition of the sample material suggested that Differential Scanning Calorimetry (DSC) was warranted to determine the phase transition temperature and heat capacity.  The results of the DSC measurements follow.
Just my opinion, but normally I wouldn't include the abbreviation in a title or chapter heading. Instead, I would introduce the abbreviation in "normal" text. So in your example, I would change the heading to 


  Chapter 4 - Results of Differential Scanning Calorimetry


but leave the rest as you have it.

An exception would be if this is a well-known abbreviation, so common that people tend to forget what it stands for. In this case, not including it might actually be confusing. For example, if a heading mentions "Internet protocol address", it might take me a split second to realise you're talking about an IP address!