Impact of Physical Stress on Salivary Buffering Capacity
Abstract: Saliva has many
properties and the buffering capacity is important for the neutralization of
oral fluids. It is unclear whether stressful conditions directly affect
salivary buffering capacity, and we investigated the impact of physical stress on
salivary buffering capacity. Methods: Twelve participants were subjected to the
physical stress of jogging and running. The salivary buffering capacity and
flow rate of the participants were measured before and after exposure to
stressful conditions. Salivary α-amylase activity was measured as a
quantitative index of stress. Results: No change in buffering capacity was
detected among each time point during the whole course under physically
stressful conditions. Next, we examined the change in buffering capacity after
jogging compared to baseline. Six participants showed an increase in buffering
capacity (Group A), while the other six participants showed a decrease or no
change (Group B) after jogging. Group B showed a decrease in flow rate and
increases in α-amylase activity and protein level after jogging, whereas Group
A showed no changes in these properties. Conclusions: The results suggest that
salivary buffering capacity changes following exposure to physically stressful
conditions, and that the changes are dependent on the stress susceptibility of
individuals.
Keywords: α-amylase activity;
physical stress; salivary buffering capacity; salivary flow rate
Author: Yu Nakashima, Emi
Nagata, Takahiko Oho
Journal Code: jpkedokterangg160328
