  Resistively-detected NMR measurements on 2D electron systems near the $\nu =
1$ quantum Hall state are reported. In contrast to recent results of Gervais
\emph{et al.} [Phys. Rev. Lett. $\bf 94$, 196803 (2005)], a dispersive
lineshape is found at all RF powers studied and Korringa-like nuclear
spin-lattice relaxation is observed. The shape of the unexplained dispersive
lineshape is found to invert when the temperature derivative of the
longitudinal resistance changes sign. This suggests that both Zeeman and
thermal effects are important to resistively-detected NMR in this regime.
