Pump Up Your Fitness Career: Dominate the 2025 IFPA Trainer Practice Exam!

Increased metabolic rate is indeed a typical physiological response during stress adaptation. When the body encounters stress, whether it is physical or psychological, there is a release of stress hormones such as adrenaline and cortisol. These hormones prepare the body for a "fight or flight" response, which boosts energy production and readiness to react to the stressor. This increased metabolic rate allows for enhanced mobilization of energy stores, ensuring that vital systems are fueled to handle the demands placed upon them.

In contrast, decreased heart rate, improved flexibility, and momentary weakness do not align with this stress response. During stress, heart rate generally increases to pump more blood and oxygen to essential organs and muscles. Flexibility may not be set to improve directly during high-stress situations as the body focuses on readiness rather than relaxation. Momentary weakness, while it may occur in some situations due to fatigue or overwhelming stress, is not a standard physiological adaptation but rather a potential side effect of excessive stress that has not been effectively managed.