GLOSSARY

Carbohydrate Oxidation Rate Table

Intake and oxidation are different quantities; these are conventional approximate research observations, not universal absorption ceilings.

Carbohydrate Oxidation Rate expresses carbohydrate oxidized per time.

Fuel choice reflects intensity, duration, availability and adaptation, usually as a mixture. Glucose-fatty-acid competition and Randle-cycle regulation explain part, not every condition alone. More fat use in a low-intensity test does not guarantee better hard exercise. Fuel should support the task, with acute oxidation separated from long-term net weight change. A switching response is context-dependent rather than a universal instruction to suppress one fuel or maximize another throughout the day.

Metabolic flexibility is the ability to alter fuel use with demand and availability, not maximal fat use at every intensity. Hard exercise can require more carbohydrate while rest or light activity uses another mixture. Diet and training adaptations have time and context. One test or respiratory ratio does not certify complete health or prescribe carbohydrate restriction for everyone. Appropriate fuel switching supports the task rather than one supposedly ideal fuel at all times.

Lipid stores and turnover reflect entry, synthesis, breakdown and oxidation across tissues. Packaging, transport and re-esterification can accompany release. Mobilization, burning and net body-fat loss are therefore different reports. Athletes should assess body-composition trends alongside intake, performance and recovery. Maximizing momentary fat oxidation may overlook session fueling, and no isolated blood fatty-acid measure or pathway rate replaces a longer-term account of energy intake and use.

Glycogenesis builds glycogen and glycogenolysis releases its units within dynamic regulation. Phosphorylated products and their route to usable glucose matter. Stores depend on diet, exercise and tissue state, not one meal's volume alone. A high post-exercise synthesis rate does not imply unlimited storage or permanent overeating. Recovery should match the next planned task, with breakdown, synthesis and net storage distinguished rather than treating every glycogen-related term as a separate nutrient requirement.

For example, when comparing an easy session with hard training, record preceding food, duration, intensity, sampling time and recovery conditions together. A changed number or an activated pathway alone does not justify changing the diet; practical decisions must remain connected to the training goal, individual tolerance and actual performance trend.

Respiratory quotient relates metabolic carbon dioxide production to oxygen use; respiratory exchange ratio measures the corresponding external gas exchange. They can approximate each other at steady state, but ventilation and buffering during hard exercise separate them. A high value is not automatically an exact carbohydrate percentage. Nonprotein calculations correct protein contribution under defined assumptions. Identify measurement level and conditions rather than treating every breathing ratio as a precise intracellular fuel measurement in all situations.

Sports fueling matches intensity, duration, stores and recovery interval. One energy pathway does not suddenly replace every other pathway completely. The practical goal is session support and restoration rather than maximizing one marker or reaction rate. A varied diet with suitable energy, protein and carbohydrate remains the foundation for evaluating metabolic claims. Consider the whole training context rather than assuming a faster biochemical step automatically produces a faster athlete.

Table references: DOI · 1