title: The effect of prior knowledge of test endpoint on non-local muscle fatigue.
abstract: BACKGROUND
  If the work duration or volume is known, it is common for individuals to anticipate this challenge by pursuing a strategy that may decrease the initial force output and maintain a force level that ensures a force reserve towards the end of the task. However, it is unknown whether this is a global strategy that is transferred to a non-exercised muscle following fatigue of a contralateral homologous muscle.
  
  
  METHODS
  To clarify if prior knowledge of task endpoint has an effect on non-local muscle fatigue (NLMF), 15 male participants (22.4 ± 3.8 years) completed four conditions: (1) KNtest > fatigue (known endpoint after fatigue), (2) UNKtest > fatigue (unknown endpoint after fatigue), (3) KNtest > control (known endpoint without fatigue), (4) UNKtest > control (unknown endpoint without fatigue). For fatigue conditions, a maximal intensity, unilateral knee extension protocol was completed (two sets of 100 s maximal voluntary isometric contractions (MVIC) with 60 s rest between), whereas the control condition involved rest (260 s). The participants were either informed (known (KN) conditions) or not informed (unknown (UNK) conditions) of the duration of a post-intervention strength-endurance test (contralateral knee extension MVIC, ≥30 s).
  
  
  RESULTS
  During the strength-endurance test, the UNKtest > fatigue displayed meaningful decreases in force (UNKtest > fatigue 10-12% over first 30 s), which was largest at the 25-30-s period (UNKtest > fatigue 7.4-41.1% from 25 to 1930s) compared to KNtest > fatigue and KNtest > control conditions, respectively.
  
  
  CONCLUSIONS
  Prior knowledge of task endpoint can modify NLMF and affect pacing strategies.
authors.affiliation: Kinesiology, School of Human Kinetics and Recreation, Memorial University of Newfoundland, 230 Elizabeth Ave., St. John's, NL, A1C 5S7, Canada.
authors.forename: Alan R
authors.initials: AR
authors.lastname: Hamilton
authors.affiliation: Kinesiology, School of Human Kinetics and Recreation, Memorial University of Newfoundland, 230 Elizabeth Ave., St. John's, NL, A1C 5S7, Canada. dbehm@mun.ca.
authors.forename: David G
authors.identifier: http://orcid.org/0000-0002-9406-6056
authors.initials: DG
authors.lastname: Behm
mesh_terms: D000293:Adolescent; D000328:Adult; D015444:Exercise; D006801:Humans; D007717:Knee / Q000502:physiology; D007721:Knowledge of Results, Psychological; D008297:Male; D018763:Muscle Fatigue; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000502:physiology*; D011897:Random Allocation
keywords: Crossover fatigue; Electromyography; Endurance; Force; Pacing; Strength