- Glow plug comprising: - a heating rod (11, 11') having an extremity, called the proximal extremity, which is equipped with an electrical power supply connection of the heating rod, - a plug body having housing, called a receiving housing, receiving of the heating rod, the latter having a distal portion which extends axially, projecting beyond the plug body, - a mounting device for mounting the heating rod in said receiving housing, - a tubular load sensing sleeve (17, 67) having: ▪ a first axial extremity, which is connected to the heating rod (11,11') so as to be driven in axial translation by the movements of the latter in at least one direction, called the proximal direction, in which the heating rod (11,11') tends to re-enter the interior of the plug body, and ▪ a second axial extremity, opposite the first axial extremity, this second axial extremity being connected to the plug body by a suitable mechanical link so that the axial translation movements of the heating rod (11,11') relative to the plug body generate axial compression and/or traction stresses in said load sensing sleeve (17,67), characterized in that said mechanical link between said second axial extremity of the load sensing sleeve (17,67) and the plug body is elastically deformable against the axial translation movements of the heating rod (11,11') relative to the plug body. - a heating rod (11, 11') having an extremity, called the proximal extremity, which is equipped with an electrical power supply connection of the heating rod, - a plug body having housing, called a receiving housing, receiving of the heating rod, the latter having a distal portion which extends axially, projecting beyond the plug body, - a mounting device for mounting the heating rod in said receiving housing, - a tubular load sensing sleeve (17, 67) having: ▪ a first axial extremity, which is connected to the heating rod (11,11') so as to be driven in axial translation by the movements of the latter in at least one direction, called the proximal direction, in which the heating rod (11,11') tends to re-enter the interior of the plug body, and ▪ a second axial extremity, opposite the first axial extremity, this second axial extremity being connected to the plug body by a suitable mechanical link so that the axial translation movements of the heating rod (11,11') relative to the plug body generate axial compression and/or traction stresses in said load sensing sleeve (17,67), characterized in that said mechanical link between said second axial extremity of the load sensing sleeve (17,67) and the plug body is elastically deformable against the axial translation movements of the heating rod (11,11') relative to the plug body. ▪ a first axial extremity, which is connected to the heating rod (11,11') so as to be driven in axial translation by the movements of the latter in at least one direction, called the proximal direction, in which the heating rod (11,11') tends to re-enter the interior of the plug body, and ▪ a second axial extremity, opposite the first axial extremity, this second axial extremity being connected to the plug body by a suitable mechanical link so that the axial translation movements of the heating rod (11,11') relative to the plug body generate axial compression and/or traction stresses in said load sensing sleeve (17,67),