Question: Sarah is a 3 2 - year - old technician at MediCool Pharmaceutical Storage. She maintains temperature - controlled medical storage units throughout her shift.

Sarah is a 32-year-old technician at MediCool Pharmaceutical Storage. She maintains temperature-controlled medical storage units throughout her shift. This requires sustained work activity.
a) Explain why we use 40% as the threshold for calculating maximum average heart rate over an 8-hour work period.
b) Calculate Sarah's recommended maximum average heart rate for her 8-hour shift if her resting heart rate is 65 bpm. Consider all relevant physiological factors for sustained work activities.

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