Familial resemblance in catecholamine changes to cold stress and maximal exercise

Area of Science:

• Physiology
• Genetics
• Human Adaptation

Background:

• Understanding familial influences on physiological responses to stress is crucial for personalized health.
• Catecholamines, such as epinephrine and norepinephrine, play key roles in the body's stress response.

Purpose of the Study:

• To investigate familial resemblances in physiological and catecholamine responses to cold stress and maximal exercise.
• To determine the extent to which genetic variation contributes to these adaptive reactions.

Main Methods:

• 38 families (parents and children) underwent cold hand immersion and maximal treadmill tests.
• Plasma epinephrine, norepinephrine, blood pressure, and heart rate were measured.
• Statistical analysis, including multiple regression and familial resemblance comparisons, was performed.

Main Results:

• Significant familial resemblances were observed in systolic blood pressure, epinephrine, and total catecholamines 1 minute after cold stress (p ≤ 0.05).
• Parent-child correlations for epinephrine, norepinephrine, and total catecholamines reached 0.38, 0.28, and 0.34, respectively.
• No familial resemblance was detected in catecholamine concentrations following maximal exercise.

Conclusions:

• Genetic variation likely contributes moderately to catecholamine changes during cold stress.
• Genetic influence on catecholamine responses to exercise stress is minimal.
• Familial factors play a role in individual adaptation to cold environments.