Charese presents a history of chronic obstructive pulmonary disease (COPD) performs a six-minute walk test. Which outcome, if observed during the test, would indicate an exacerbation or worsening of the patient's COPD?
A. Increased stride length
B. Decreased use of accessory muscles for breathing
C. A decrease in SpO2 below 90%
D. A decrease in respiratory rate
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