Lactate Threshold & Onset of Blood Lactate Accumulation (OBLA)

The video tutorial explains the concepts of lactate threshold and OBLA (onset of blood lactate accumulation) in the context of exercise physiology. It discusses how lactate is produced during glycolysis and its role in energy production at different exercise intensities. The tutorial covers the aerobic and anaerobic thresholds, explaining how they relate to heart rate and exercise intensity. It also highlights the significance of lactate clearance and accumulation, and how these thresholds can be used to estimate VO2 Max.

What does OBLA stand for in exercise physiology?

• Onset of Blood Lactate Accumulation

• Onset of Body Lactic Acid

• Onset of Blood Lipid Accumulation

• Onset of Body Lactate Activity

Which process is responsible for the production of lactate in the body?

• Glycolysis

• Oxidative Phosphorylation

• Photosynthesis

• Krebs Cycle

What is the primary energy source during low-intensity exercise?

• Anaerobic metabolism

• Aerobic metabolism

• Lipid metabolism

• Protein metabolism

At what point does aerobic metabolism become insufficient during exercise?

• When lactate levels are zero

• When heart rate exceeds 100 beats per minute

• When exercise intensity is very low

• When exercise intensity crosses the aerobic threshold

What happens to lactate production when the lactate threshold is crossed?

• It increases exponentially

• It remains constant

• It decreases linearly

• It stops completely

What is the consequence of crossing the anaerobic threshold?

• Increased lactate accumulation

• Increased lactate clearance

• Decreased lactate accumulation

• Decreased exercise intensity

What is a typical lactate concentration at the onset of OBLA?

• 6 millimolar

• 4 millimolar

• 8 millimolar

• 2 millimolar

How is OBLA useful in exercise physiology?

• It calculates body mass index

• It determines muscle strength

• It measures heart rate

• It helps in predicting VO2 Max

At what percentage of heart rate max does OBLA typically occur?

• 65%

• 95%

• 50%

• 85%

What percentage of VO2 Max is typically associated with OBLA?

• 50%

• 60%

• 75%

• 90%