OBLA is defined as:

OBLA is defined as:

• A. The Cori cycle
• B. OBLA
• C. Buffering
• D. Calorimetry

Answer: (B)

OBLA stands for the onset of blood lactate accumulation. It is the exercise intensity at which lactate begins to rise rapidly in the blood because production outpaces clearance, signaling a shift toward greater anaerobic metabolism. This definition is why the term OBLA is the best answer: it is naming the very phenomenon it describes. In practice, OBLA is often linked with a blood lactate concentration around 4 mmol/L, used as a marker for anaerobic threshold and to help set training intensities. The other options refer to different concepts—Cori cycle involves lactate conversion back to glucose, buffering relates to maintaining pH, and calorimetry measures energy expenditure from heat—so they don’t define OBLA.

OBLA stands for the onset of blood lactate accumulation. It is the exercise intensity at which lactate begins to rise rapidly in the blood because production outpaces clearance, signaling a shift toward greater anaerobic metabolism. This definition is why the term OBLA is the best answer: it is naming the very phenomenon it describes. In practice, OBLA is often linked with a blood lactate concentration around 4 mmol/L, used as a marker for anaerobic threshold and to help set training intensities. The other options refer to different concepts—Cori cycle involves lactate conversion back to glucose, buffering relates to maintaining pH, and calorimetry measures energy expenditure from heat—so they don’t define OBLA.