Final answer:
The subject's O2 consumption at maximal exercise is calculated using the formula VO2 = (FIO2 - FEO2) * E, which yields a result of 1.65 liters per minute (STPD).
Step-by-step explanation:
The question is asking to calculate the subject's O2 consumption in liters per minute (STPD), using exhaled gas analysis at maximal exercise. To find this, we need to use the given values: FIO2 (fraction of inspired oxygen), FEO2 (fraction of expired oxygen), FECO2 (fraction of expired carbon dioxide), and E (expiratory volume in liters per minute at STPD conditions).
The formula to calculate oxygen consumption (VO2) is as follows: VO2 = (FIO2 - FEO2) * E. Substituting in the given values, we get VO2 = (0.21 - 0.16) * 33.0 L/min = 0.05 * 33.0 L/min = 1.65 L/min of O2.
Therefore, the O2 consumption for the subject at maximal exercise is 1.65 liters per minute (STPD).