nerdexam
ACSM

010-111 · Question #20

Under which of the following circumstances would you expect to see the highest rise in blood lactate?

The correct answer is C. During maximal exercise lasting between 60 and 180 seconds in the athlete. Trained athletes performing maximal exercise in the 60-180 second window produce the highest blood lactate because they can sustain far greater absolute workloads than untrained individuals, driving peak anaerobic glycolytic output.

Initial Client Consultation and Assessment

Question

Under which of the following circumstances would you expect to see the highest rise in blood lactate?

Options

  • ADuring maximal exercise lasting between 60 and 180 seconds in the untrained client
  • BPrior to treadmill walking in the cardiac patient
  • CDuring maximal exercise lasting between 60 and 180 seconds in the athlete
  • DAfter moderate intensity cycling exercise in the client with Type 2 diabetes

How the community answered

(25 responses)
  • A
    8% (2)
  • B
    4% (1)
  • C
    76% (19)
  • D
    12% (3)

Why each option

Trained athletes performing maximal exercise in the 60-180 second window produce the highest blood lactate because they can sustain far greater absolute workloads than untrained individuals, driving peak anaerobic glycolytic output.

ADuring maximal exercise lasting between 60 and 180 seconds in the untrained client

Untrained clients cannot achieve or sustain the same absolute workload as trained athletes during maximal effort, resulting in lower glycolytic flux and therefore lower peak blood lactate values.

BPrior to treadmill walking in the cardiac patient

Prior to exercise the body is at rest and glycolytic activity is minimal, so blood lactate remains near baseline levels with no significant rise.

CDuring maximal exercise lasting between 60 and 180 seconds in the athleteCorrect

Athletes possess greater muscle mass, higher concentrations of glycolytic enzymes, and the neuromuscular capacity to sustain maximal power output for the full 60-180 second window, which corresponds to peak anaerobic glycolytic demand. Their ability to recruit a larger proportion of fast-twitch muscle fibers at higher absolute intensities results in greater net lactate production compared to untrained individuals performing the same relative effort. The combination of high intensity and sufficient duration maximizes lactate accumulation.

DAfter moderate intensity cycling exercise in the client with Type 2 diabetes

Moderate-intensity cycling remains below the lactate threshold for most individuals, resulting in minimal net lactate accumulation regardless of the presence of Type 2 diabetes.

Concept tested: Blood lactate response to exercise intensity and training status

Topics

#blood lactate#energy systems#anaerobic metabolism#maximal exercise

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