Crossfit CrossFit Energy Systems and Metabolic Conditioning

Question 1

Which energy system provides the primary fuel source during a maximal-effort sprint lasting 10 seconds or less?

Accepted Answer

Phosphagen (ATP-PC)

Answer

The phosphagen system uses stored ATP and creatine phosphate to fuel very short, maximal efforts up to about 10 seconds.

Question 2

During a 400-meter run at near-maximal pace, which energy system is predominantly active?

Accepted Answer

Glycolytic

Answer

The glycolytic system dominates efforts lasting roughly 30 seconds to 2 minutes, such as a fast 400-meter run.

Question 3

Which energy system is the primary contributor during a 20-minute moderate-intensity row?

Accepted Answer

Oxidative

Answer

The oxidative (aerobic) system is dominant for sustained efforts lasting more than about 2–3 minutes.

Question 4

CrossFit's broad time and modal domains are designed to develop fitness across all three metabolic pathways. Which statement best describes this approach?

Accepted Answer

Use varied workouts that stimulate phosphagen, glycolytic, and oxidative systems

Answer

CrossFit intentionally varies workout duration and intensity so all three energy systems are regularly trained.

Question 5

What physiological adaptation most directly improves an athlete's capacity in the oxidative energy system?

Accepted Answer

Greater mitochondrial density

Answer

Greater mitochondrial density allows more oxidative phosphorylation, directly improving aerobic capacity.

(Crossfit) CrossFit Level 1 Trainer Certification Practice Test

(Crossfit) CrossFit Level 1 Trainer Certification Practice Test

Crossfit CrossFit Energy Systems and Metabolic Conditioning