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HMS, BM EQ-Bank 407 MC

A student conducted an investigation on heart rate recovery after aerobic exercise by measuring participants' heart rates at 1-minute intervals following a step test. The student found that measurements varied significantly when using different pulse-taking methods (wrist, neck, and chest monitor).

Which statement best explains the issue with the data collection method?

  1. The investigation lacks credibility because heart rate recovery isn't a valid measure of aerobic fitness.
  2. The investigation lacks validity because different pulse-taking methods were not calibrated against each other.
  3. The investigation lacks reliability because inconsistent measuring techniques were used across participants.
  4. The investigation lacks credibility because a step test isn't an appropriate activity for testing aerobic fitness.
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Consider Option C: 

  • The investigation lacks reliability because using different pulse-taking methods without standardisation creates inconsistency in the measurements.
  • Reliability refers to the consistency of results when repeated measurements are taken, and in this case, the varying methods reduce the reliability of the data.

Other Options:

  • A is incorrect: Heart rate recovery is a valid measure of aerobic fitness; the issue is not with the validity of what’s being measured.
  • B is incorrect: While calibration is important, the primary issue here is the inconsistent application of measuring techniques (a reliability issue), not validity.
  • D is incorrect: Step tests are widely accepted as appropriate for testing aerobic fitness; the credibility of the method itself is not in question.