Post-competition blood lactate concentrations in collegiate swimmers

Area of Science:

• Sports Medicine
• Exercise Physiology
• Biochemistry

Background:

• Lactate (LA) accumulation is a key indicator of anaerobic metabolism during intense exercise.
• Understanding lactate kinetics in collegiate swimmers is crucial for optimizing training and performance.

Purpose of the Study:

• To quantify post-competition blood lactate (LA) concentrations in collegiate swimmers.
• To compare LA levels across different swimming race distances and identify events with the highest metabolic stress.

Main Methods:

• Blood samples were collected from 23 collegiate swimmers 5 minutes post-race.
• Lactate concentrations were measured using an enzymatic assay.
• Maximal effort non-competitive swims were included to control for motivation effects.

Main Results:

• The 200-yd individual medley resulted in the highest mean lactate concentration (25.7 mM/L).
• 200-yd races (butterfly, backstroke, breaststroke, freestyle) showed similar mean lactate levels (16.4–20.6 mM/L).
• Longer events, 500-yd and 1,000-yd freestyle, had lower mean lactate concentrations (15.6 mM/L and 10.0 mM/L, respectively).
• Competitive swims showed slightly higher lactate levels than non-competitive swims at similar distances.

Conclusions:

• The 200-yd individual medley imposes the greatest acute metabolic demand among collegiate swimming events studied.
• Lactate accumulation varies significantly with swimming event distance and stroke.
• These findings provide valuable insights into the physiological demands of competitive swimming.