Chapter 14 True/False

Carnitine supplements both raise muscle carnitine concentrations and enhance exercise performance.

False

The average protein intake for an adult female is far less than the RDA.

False

The American College of Sports Medicine recommends that aerobic exercise be limited to no more than four days a week.

False 5-7 day a week

Resistance training is critical for cardiorespiratory fitness.

False Building muscle

After the first 30 seconds or so of intense activity, muscle cells call upon the lactic acid system to produce more ATP.

False; 10 seconds

Glycogen supplies can easily support everyday activities, but are limited to less than 6000 kcalories of energy.

False; less than 2000 kcals of energy

Energy drinks are an excellent choice for fluid replacement during athletic events.

False; water an excellent choice for fluid replacement

Even casual exercisers must attend conscientiously to their fluid needs.

True

Flexibility allows the joints to move freely, reducing the risk of injury.

True

Immediately after the onset of a demand, before muscle ATP pools dwindle, a muscle enzyme begins to break down another high-energy compound that is stored in the muscle, creatine phosphate.

True

In hyperthermia, body heat builds up and triggers maximum sweating, but without sweat evaporation, little cooling takes place.

True

Only about 20 percent of adults in the United States meet physical activity guidelines.

True

Physically active young women, especially those who engage in endurance activities such as distance running, are prone to iron deficiency.

True

To meet the more prolonged demands of sustained activity, the muscles rely on the aerobic system to provide ATP for muscle contraction.

True

Walking at 3 to 4.5 miles an hour would be categorized as a moderate level of exercise.

True