According to the dietary guidelines for Americans which of the following is important in order to maintain a healthy weight.
D. Eat nutrient-dense food
C. A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal.
Answer:
More oxygen is also going to the muscles. This means the heart beats fewer times per minute than it would in a nonathlete. However, an athlete's heart rate may go up to 180 bpm to 200 bpm during exercise. Resting heart rates vary for everyone, including athletes.
Explanation: