Table 1.

Response of MAPK phosphorylation to mechanical stimuli in aging skeletal muscle.

isoform	Tissue(s)	Stimulation	Aged (vs. young)	Reference
p38	Red TA	Electrical	Similar	(Ljubicic and Hood, 2009)
	EDL	Stretch	Similar	(Hornberger et al., 2005)
	EDL	Stretch	Similar	(Mylabathula et al., 2006)
	Soleus	Stretch	Lower	(Mylabathula et al., 2006)
	VL	Exercise	Lower	(Williamson et al., 2003)
	VL	Resistance training	Higher	(Kosek and Bamman, 2008)
JNK	EDL	Stretch	Similar	(Hornberger et al., 2005)
	EDL	Stretch	Lower	(Mylabathula et al., 2006)
	Soleus	Stretch	Similar	(Mylabathula et al., 2006)
	VL	Exercise	Lower	(Williamson et al., 2003)
ERK	EDL	Stretch	Higher	(Mylabathula et al., 2006)
	Soleus	Stretch	Higher	(Mylabathula et al., 2006)
	VL	Exercise	Higher	(Williamson et al., 2003)
	VL	Resistance training	Similar	(Kosek and Bamman, 2008)
	TA	Electrical	Lower	(Parkington et al., 2004)
	Plantaris	Electrical	Lower	(Parkington et al., 2004)

TA: tibialis anterior; EDL: Extensor digitorum longus; VL: vastus lateralis.