The reserves went down to a 2-1 defeat in a friendly fixture at Notts County on Tuesday afternoon, which was played in soaring temperatures.Notts took a 35th minute lead from the penalty spot, Graham Burke converting following a foul inside the area.
Wes Atkinson found the net to increase the home side's lead four minutes after the re-start.
The Spireites pulled a goal back when Kristian Dennis scored a penalty, but they were unable to force an equaliser.
Chesterfield: Allinson, Graham, Daly, Raglan, Maguire, Beesley, Dimaio, Dennis, Simons, Mitchell, Morrison.
Subs: Smith, German, Ofoegbu,Rowley, Jones.