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The elevation of HR, which is associated with age, HRrest and exercise capacity, [68,69] is regulated by exercise-induced autonomic control, where sympathetic activity increases and vagal tone is reduced

Decades of research have established that free cortisol in saliva closely reflects the physiologically active fraction, making salivary testing a well-validated approach for tracking the body's active cortisol response in everyday conditions

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a well-made manual machine can last for years, if not decades, with minimal maintenance

Cigarettes are not just harmful to smokers