Relationship between Self-Selected Pacing Strategy and Lactate Response in Individual Medley Time Trials

Location

Hopwood Auditorium

Access Type

Campus Access Only

Entry Number

69

Start Date

4-5-2023 3:30 PM

End Date

4-5-2023 3:45 PM

College

College of Health Sciences

Department

Exercise Physiology

Keywords

pacing, blood lactate, time till completion, Division III

Abstract

The 200 and 400-yard individual medley (IM) are two swimming events that challenge swimmers' versatility. Each event has different physiological requirements, where the 200 IM is viewed as an anaerobic event and the 400 IM is an aerobic event. Additionally, the IMs require performance in all four competitive strokes in a specific order, butterfly, backstroke, breaststroke, and freestyle with each stroke requiring a different magnitude of intensity, efficiency, and speed.

Purpose: To study the different pacing strategies and blood lactate response during the 200 IM and 400 IM in NCAA Division III swimmers.

Methods: 10 NCAA Division III swimmers (age: 19.7 ± 0.95yrs, height: 169.0 ± 6.4cm, weight: 71.8 ± 0.95kg) performed simulated time trials of the 200 IM and 400IM during the competitive season. Blood lactate (BLA) was taken prior to warm-up, prior to racing, and at the completion of the time trial. ΔBLA was calculated from the pre and post-BLA. Splits were taken for each lap (50 yards) of each stroke as well as segment (50 and 100 yards) velocities were calculated. Additionally, the percent of the total time each stroke took was also calculated. Multiple repeated measures ANOVAs were used to determine significant differences.

Results: No significant differences (p>0.05) were reported between the BLA Post 2IM (8.9±3.2) and BLA Post 4IM (8.87±2.4), nor in ΔBLA2IM (7.56±3.25) and ΔBLA4IM (6.11±2.82). RPE was found to be significantly (p<0.01) greater following the 4IM (9.1±0.88) versus the 2IM (7.4±0.84). Significant interactions were found (p<0.05) between the stroke velocities and stroke percentage of total time for the 2IM and 4IM.

Conclusion: BLA showed that there was an equivalent amount of fatigue between the 2IM and 4IM but the exertion requirement was different. Butterfly’s velocity and butterfly, backstroke, and freestyle stroke percentage of total time played a significant role in the difference between pacing strategies between 2IM and 4 IM

Faculty Mentor(s)

Dr. Sean M Collins
Dr. Price Blair
Dr. Jeffrey Herrick

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Apr 5th, 3:30 PM Apr 5th, 3:45 PM

Relationship between Self-Selected Pacing Strategy and Lactate Response in Individual Medley Time Trials

Hopwood Auditorium

The 200 and 400-yard individual medley (IM) are two swimming events that challenge swimmers' versatility. Each event has different physiological requirements, where the 200 IM is viewed as an anaerobic event and the 400 IM is an aerobic event. Additionally, the IMs require performance in all four competitive strokes in a specific order, butterfly, backstroke, breaststroke, and freestyle with each stroke requiring a different magnitude of intensity, efficiency, and speed.

Purpose: To study the different pacing strategies and blood lactate response during the 200 IM and 400 IM in NCAA Division III swimmers.

Methods: 10 NCAA Division III swimmers (age: 19.7 ± 0.95yrs, height: 169.0 ± 6.4cm, weight: 71.8 ± 0.95kg) performed simulated time trials of the 200 IM and 400IM during the competitive season. Blood lactate (BLA) was taken prior to warm-up, prior to racing, and at the completion of the time trial. ΔBLA was calculated from the pre and post-BLA. Splits were taken for each lap (50 yards) of each stroke as well as segment (50 and 100 yards) velocities were calculated. Additionally, the percent of the total time each stroke took was also calculated. Multiple repeated measures ANOVAs were used to determine significant differences.

Results: No significant differences (p>0.05) were reported between the BLA Post 2IM (8.9±3.2) and BLA Post 4IM (8.87±2.4), nor in ΔBLA2IM (7.56±3.25) and ΔBLA4IM (6.11±2.82). RPE was found to be significantly (p<0.01) greater following the 4IM (9.1±0.88) versus the 2IM (7.4±0.84). Significant interactions were found (p<0.05) between the stroke velocities and stroke percentage of total time for the 2IM and 4IM.

Conclusion: BLA showed that there was an equivalent amount of fatigue between the 2IM and 4IM but the exertion requirement was different. Butterfly’s velocity and butterfly, backstroke, and freestyle stroke percentage of total time played a significant role in the difference between pacing strategies between 2IM and 4 IM