[Relationship between oxygen deficit and VO2max in supramaximal running]

Area of Science:

• Exercise Physiology
• Sports Science
• Human Performance

Background:

• Understanding the relationship between oxygen uptake and energy deficit is crucial for assessing exercise intensity and physiological limits.
• Maximal accumulated oxygen deficit (DO2max) represents the body's anaerobic energy system contribution during high-intensity exercise.
• Maximal oxygen uptake (VO2max) is a key indicator of aerobic fitness and endurance capacity.

Purpose of the Study:

• To investigate the relationship between DO2max and VO2max in healthy male subjects.
• To quantify the linear correlation between accumulated oxygen deficit and maximal oxygen uptake during supramaximal exercise.
• To determine the energy equivalent of the mean accumulated DO2max.

Main Methods:

• 43 healthy male subjects with varying VO2max levels (45-70 ml O2/kg.min) participated.
• Supramaximal runs were conducted on an inclined treadmill until volitional exhaustion.
• Maximal accumulated oxygen deficit (DO2max) was measured.

Main Results:

• A significant linear relationship was found between DO2max and VO2max (DO2max = 39.7 + 0.31 VO2max, r = 0.701, P < 0.001).
• The mean accumulated DO2max was 58 ml O2/kg.
• This mean DO2max corresponds to an energy expenditure of 1212 J/kg.

Conclusions:

• DO2max is a reliable predictor of VO2max in healthy males during intense exercise.
• The linear relationship provides a quantitative measure of anaerobic contribution relative to aerobic capacity.
• Findings contribute to a better understanding of energy metabolism during maximal physical exertion.