Effects of Training-Induced Fatigue on Pacing Patterns in 40-km Cycling Time Trials

SKORSKI, SABRINA1; HAMMES, DANIEL1; SCHWINDLING, SASCHA1; VEITH, SEBASTIAN1; PFEIFFER, MARK2; FERRAUTI, ALEXANDER3; KELLMANN, MICHAEL3,4; MEYER, TIM1

Medicine & Science in Sports & Exercise: March 2015 - Volume 47 - Issue 3 - p 593–600
doi: 10.1249/MSS.0000000000000439
Applied Sciences

Introduction: In some endurance sports, athletes complete several competitions within a short period, resulting in accumulated fatigue. It is unclear whether fatigued athletes choose the same pacing pattern (PP) as when they have recovered.

Purpose: This study aimed to analyze effects of fatigue on PP of cyclists during a 40-km time trial (TT).

Methods: Twenty-three male cyclists (28.8 ± 7.6 yr) completed three 40-km TT on a cycle ergometer. TT were conducted before (TT1) and after (TT2) a 6-d training period. A third TT was carried out after 72 h of recovery (TT3). Training days consisted of two cycling sessions: mornings, 1 h at 95% of lactate threshold or 3 × 5 × 30 s all-out sprint; afternoons, 3 h at 80% individual anaerobic threshold. Four-kilometer split times (min) and RPE were recorded during TT.

Results: Performance decreased from TT1 to TT2 (65.7 ± 3.5 vs 66.7 ± 3.3 min; P < 0.05) and increased from TT2 to TT3 (66.7 ± 3.3 vs 65.5 ± 3.3 min; P < 0.01). PP showed a significant difference between TT1 and TT2 (P < 0.001) as well as between TT2 and TT3 (P < 0.01). PP in TT1 and TT3 showed no significant difference (P > 0.05). In TT1 and TT3, cyclists started faster in the first 4 km compared with TT2. RPE course showed no significant difference between TT (P > 0.05).

Conclusions: Fatigue reversibly changes the PP of cyclists during a 40-km TT. Participants reduced their power output until premature exhaustion seemed very unlikely. This supports the assumption that pacing includes a combination of anticipation and feedback mechanisms.

1Institute of Sports and Preventive Medicine, Saarland University, Saarbrücken, GERMANY; 2Institute of Sports Science, Johannes-Gutenberg University, Mainz, GERMANY; 3Faculty of Sports Science, Ruhr-University of Bochum, Bochum, GERMANY; and 4School of Human Movement Studies and School of Psychology, University of Queensland, Brisbane, Queensland, AUSTRALIA

Address for correspondence: Sabrina Skorski, Institute of Sports and Preventive Medicine, Saarland University, Campus Bldg. B8.2, 66123 Saarbrücken, Germany; E-mail: s.skorski@mx.uni-saarland.de.

Submitted for publication January 2014.

Accepted for publication June 2014.

© 2015 American College of Sports Medicine