Fig. 2 demonstrates that the diurnal patterns of BP, NBT and ACT
started at 09:00 and lasted for 12 h under cold and warm conditions.
Sleep time 00:00 was 07:30. There were significant increases
in SBP and DBP and decreases in NBT after awakening in cold conditions
whereas there was no significant difference in ACT during
sleep period and after awakening (Fig. 2A). The NBT values were
not significantly different between cold and warm conditions in
first half (P = 0.486) and second half (P = 0.640) of sleep. In addition,
ACT values were not significantly different between cold
and warm conditions in the first half (P = 0.865) and second half
(P = 0.117) of sleep (Fig. 2). The average BP values recorded during
the sleep period (00:00–07:30) and during morning time (07:30–
08:30) under cold conditions are displayed in Figs. 2B and 3A.
Under cold exposure, the SBP and DBP during the MBPS were significantly
greater, and NBT was significantly lower than in warm
conditions (P < 0.05), whereas the ACT was not significantly different
during this period. These results revealed that different ambient
temperatures had noticeable effects on NBT changes, possibly
affecting MBPS. Significant changes in HRV indices, excluding TP,
in cold conditions as well as HF and LF in warm conditions, indicated
that ambient temperature had a significant effect on ANS
functions, whereas there were no significant differences between
the two conditions in HRV indices during the MBPS period.
Fig. 2 demonstrates that the diurnal patterns of BP, NBT and ACTstarted at 09:00 and lasted for 12 h under cold and warm conditions.Sleep time 00:00 was 07:30. There were significant increasesin SBP and DBP and decreases in NBT after awakening in cold conditionswhereas there was no significant difference in ACT duringsleep period and after awakening (Fig. 2A). The NBT values werenot significantly different between cold and warm conditions infirst half (P = 0.486) and second half (P = 0.640) of sleep. In addition,ACT values were not significantly different between coldand warm conditions in the first half (P = 0.865) and second half(P = 0.117) of sleep (Fig. 2). The average BP values recorded duringthe sleep period (00:00–07:30) and during morning time (07:30–08:30) under cold conditions are displayed in Figs. 2B and 3A.Under cold exposure, the SBP and DBP during the MBPS were significantlygreater, and NBT was significantly lower than in warmconditions (P < 0.05), whereas the ACT was not significantly differentduring this period. These results revealed that different ambienttemperatures had noticeable effects on NBT changes, possiblyaffecting MBPS. Significant changes in HRV indices, excluding TP,in cold conditions as well as HF and LF in warm conditions, indicatedthat ambient temperature had a significant effect on ANSfunctions, whereas there were no significant differences betweenthe two conditions in HRV indices during the MBPS period.
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