Vignette #2 Jill is 32 years old, and after years of a mostly sedentary life is determined to get into shape. She decides to take up jogging but cannot decide whether to jog at a moderate pace or very fast pace, and has no idea how long to continue. Jill also wants to learn to monitor her heart rate and pulse. She was a gymnast in high school but can no longer touch her toes. Suggest how Jill should get started by answering these questions.
When Jill is jogging, which characteristic determines whether this activity is aerobic or anaerobic?

Question

Quizplus · Accepted Answer

The quantity of oxygen in Jill's muscles determines whether the activity is aerobic (with sufficient oxygen for prolonged exercise) or anaerobic (without sufficient oxygen for prolonged exercise). When the body runs out of oxygen, it switches to anaerobic metabolism, which generates lactic acid as a byproduct, leading to fatigue and muscle soreness. Therefore, to jog at a moderate or fast pace, Jill needs to ensure she is taking in enough oxygen to support aerobic metabolism, which can be achieved by monitoring her heart rate and pulse. As a beginner, she should start with a pace that allows her to talk comfortably while exercising and gradually increase the duration and intensity of her jogs over time. To improve her flexibility, Jill can also add stretching exercises to her routine and gradually work towards touching her toes again.

Vignette #2 Jill Is 32 Years Old, and After Years