Exercise modality effect on oxygen uptake off-transient kinetics at maximal oxygen uptake intensity.

Area of Science:

• Exercise Physiology
• Sports Science
• Human Performance

Background:

• Oxygen uptake (V̇O2) off-kinetcs during recovery are crucial for training and performance but remain underexplored across different exercise modalities.
• Understanding V̇O2 off-transient kinetics differences can inform optimized training and recovery strategies.

Purpose of the Study:

• To compare V̇O2 off-transient kinetics between swimmers, rowers, runners, and cyclists during maximal intensity exercise.
• To investigate the symmetry of oxygen uptake on- and off-transient kinetics across these distinct exercise modes.

Main Methods:

• Eight participants from each group (swimmers, rowers, runners, cyclists) underwent incremental and square-wave exercise protocols to exhaustion at maximal oxygen uptake (V̇O2max).
• Pulmonary gas exchange parameters were measured using a portable telemetric gas analyzer.
• V̇O2 on- and off-transient kinetics were analyzed using a double-exponential model.

Main Results:

• V̇O2 on- and off-transient kinetics were symmetrical across all exercise modes when fitted with a double-exponential model.
• The amplitude of the fast component of V̇O2 off-response was significantly higher in running compared to cycling.
• The time constant of the fast component was significantly higher in swimming compared to rowing and cycling.

Conclusions:

• Mechanical differences in exercise modes significantly influence V̇O2 off-transient kinetics at maximal intensity.
• Swimmers exhibit slower V̇O2 recovery kinetics, suggesting a need for longer recovery intervals compared to rowers and cyclists.
• Findings provide insights for tailored training prescription based on exercise modality and recovery needs.