Figure 4.

Group summary data for absolute SSNA (total activity) during baseline (base) and during the first minute of mental stress (MS) at mean skin temperature (T_sk) 34°C and T_sk 30.5°C in young and older adults (A and C, respectively), as well as the increase in SSNA during mental stress from the preceding baseline in each temperature condition for young and older adults (B and D, respectively)

The SSNA response to mental stress (i.e. the increase in SSNA) was not different during cold stress in either group. *P < 0.05 vs. Base T_sk 34°C; ^†P < 0.05 vs. Base T_sk 30.5°C; ^‡P < 0.05 vs. MS T_sk 34°C.