2007, Piran, Slovenia

Sweating
the forearm and thigh skin using iontophoresis (direct current of 2 mA for 5 min), after a 45min
equilibrium period. The Ach-induced SR was measured continuously for 7 min
immediately after the current was stopped, and the mean SR was calculated using the data for
the last 5 min. Immediately after the Ach-induced SR measurement, the ASG density was
determined using the starch-iodide technique. The oral (Tor) and skin (Tsl; at the forearm and
thigh) temperatures were measured during the equilibrium period using thermistor probes.
RESULTS
Exercise test. The TF (54 ±2 ml/kg/min) and TM (57 ±2 ml/kg/min) had significantly higher
VO2max than the UF (43 ±1 ml/kg/min) and UM (47 ±1 ml/kg/min), respectively. No sex
differences in the VO2max were observed for the TF versus TM or UF versus UM groups. The
Tre, Tb, and HR values increased significantly with exercise intensity in each group. However,
there were no group differences in the Tre, Tb, HR, or Tsk values at rest or at the end of
exercising at 35, 50, and 65% of VO2max.
The mean SR increased in all groups (Figure 1), and was significantly greater in the TF group
than in the UF group at all exercise intensities, and significantly greater in the TM group than
in the UM group at 50% and 65% VO2max. The SR was significantly lower in the TF group
than in the TM group at 50% and 65% VO2max, and tended to be lower in the UF group than in
the UM group only at 65% VO2max. Moreover, the slope of the relationship between exercise
intensity and the mean SR was significantly greater in the TM group than in the other groups,
and was greater in the TF group than in the
SR (mg/cm 2 /min)
ASG (glands/cm 2 )
SGO (µg/gland/min)
2.0
1.5
1.0
0.5
0.0
120
100
80
60
20
16
12
8
4
0
Mean
(Forehead, Chest, Back,
Forearm, and Thigh)
†
*
35 50 65
Intensity (%VO2max)
*
†
*
†
*
†
*
TF
UF
TM
UM
UF group; the slope was similar between the
TF and UM groups. No marked group
differences were observed in the mean ASG
at each exercise intensity. The mean SGO
increased significantly with exercise
intensity in all groups. The SGO was
significantly greater in the TF and TM
groups than in the UF and UM groups at
50% and 65% VO2max, respectively. As for
the SR, the effect of physical training on the
SGO was marked with an increase in
exercise intensity and was more remarkable
in the men than in the women.
Figure 1. Sweating rate (SR), active sweat
glands (ASG), and sweat gland output
(SGO) during cycling exercise at each
intensity (35%, 50%, and 65%VO2max) in
physically trained (TF) and untrained (TF)
females and trained (TM) and untrained
(UM) males. Values are means ± SEM. *
†
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