PURPOSE: To evaluate pacing behavior and peripheral and central contributions to muscle fatigue in 1500m speed skating and cycling time-trials, when a faster or slower start is instructed.
METHODS: Nine speed skaters and nine cyclists, all competing at regional or national level, performed two 1500m time-trials in their sport. Athletes were instructed to start faster than usual in one trial and slower in the other. Mean velocity was measured per 100m. Blood lactate concentrations were measured. Maximal voluntary contraction (MVC), voluntary activation (VA) and potentiated twitch (PT) of the quadriceps muscles were measured to estimate central and peripheral contributions to muscle fatigue. In speed skating, knee, hip and trunk angles were measured to evaluate technique.
RESULTS: Cyclists showed a more explosive start than speed skaters in the fast-start time-trial (cyclists performed first 300m in 24.70±1.73s, speed skaters in 26.18±0.79s). Both trials resulted in reduced MVC (12.0±14.5%), VA (2.4±5.0%) and PT (25.4±15.2%). Blood lactate concentrations after the time-trial and the decrease in PT were greater in the fast-start than in the slow-start trial. Speed skaters showed higher trunk-angles in the fast-start than in the slow-start trial, while knee-angles remained similar.
CONCLUSIONS: Despite similar instructions, behavioral adaptations in pacing differed between the two sports, resulting in equal central and peripheral contributions to muscle fatigue in both sports. This provides evidence for the importance of neurophysiological aspects in the regulation of pacing. It also stresses the notion that optimal pacing needs to be studied sport-specifically, and coaches should be aware of this.
|Number of pages||7|
|Journal||International journal of sports physiology and performance|
|Publication status||Published - 11-Apr-2016|
- athletic performance
- central fatigue
- peripheral fatigue
- sport science
- TWITCH INTERPOLATION