What type of speed-endurance workout is characterized by lactate threshold training?

The type of speed-endurance workout characterized by lactate threshold training is best represented by interval training. This approach focuses on alternating periods of higher intensity efforts with recovery periods, which allows athletes to enhance their ability to sustain high levels of exertion without accumulating excessive lactate in the muscles.

Lactate threshold refers to the exercise intensity at which lactate begins to accumulate in the bloodstream, affecting performance. By training at or near this threshold through intervals, athletes improve their metabolic conditioning, enabling them to maintain faster paces for longer durations. This type of training is effective for developing both speed and endurance simultaneously by pushing the body's limits and facilitating adaptations that increase performance potential.

In contrast, pace/tempo training maintains a steady pace to improve running economy and endurance but does not focus specifically on intervals or the management of lactate buildup like interval training does. Long, slow distance workouts emphasize training at a lower intensity, primarily targeting aerobic capacity over lactate threshold, while fartlek training involves varied pacing but lacks the structured intensity and recovery focus found in true interval training.