title: The repeated bout effect of typical lower body strength training sessions on sub-maximal running performance and hormonal response.
abstract: OBJECTIVE
  This study examined the effects of two typical strength training sessions performed 1 week apart (i.e. repeated bout effect) on sub-maximal running performance and hormonal.
  
  
  METHODS
  Fourteen resistance-untrained men (age 24.0 ± 3.9 years; height 1.83 ± 0.11 m; body mass 77.4 ± 14.0 kg; VOpeak 48.1 ± 6.1 M kg(-1) min(-1)) undertook two bouts of high-intensity strength training sessions (i.e. six-repetition maximum). Creatine kinase (CK), delayed-onset muscle soreness (DOMS), counter-movement jump (CMJ) as well as concentrations of serum testosterone, cortisol and testosterone/cortisol ratio (T/C) were examined prior to and immediately post, 24 (T24) and 48 (T48) h post each strength training bout. Sub-maximal running performance was also conducted at T24 and T48 of each bout.
  
  
  RESULTS
  When measures were compared between bouts at T48, the degree of elevation in CK (-58.4 ± 55.6 %) and DOMS (-31.43 ± 42.9 %) and acute reduction in CMJ measures (4.1 ± 5.4 %) were attenuated (p < 0.05) following the second bout. Cortisol was increased until T24 (p < 0.05) although there were no differences between bouts and no differences were found for testosterone and T/C ratio (p > 0.05). Sub-maximal running performance was impaired until T24, although changes were not attenuated following the second bout.
  
  
  CONCLUSIONS
  The initial bout appeared to provide protection against a number of muscle damage indicators suggesting a greater need for recovery following the initial session of typical lower body resistance exercises in resistance-untrained men although sub-maximal running should be avoided following the first two sessions.
authors.affiliation: Sport and Exercise Science, James Cook University, Townsville, Australia, kenji.doma@my.jcu.edu.au.
authors.forename: Kenji
authors.initials: K
authors.lastname: Doma
authors.forename: Moritz
authors.initials: M
authors.lastname: Schumann
authors.forename: Wade H
authors.initials: WH
authors.lastname: Sinclair
authors.forename: Anthony S
authors.initials: AS
authors.lastname: Leicht
authors.forename: Glen B
authors.initials: GB
authors.lastname: Deakin
authors.forename: Keijo
authors.initials: K
authors.lastname: Häkkinen
mesh_terms: D000328:Adult; D015308:Anaerobic Threshold / Q000502:physiology; D003402:Creatine Kinase / Q000097:blood; D006728:Hormones / Q000097:blood*; D006801:Humans; D006854:Hydrocortisone / Q000097:blood; D035002:Lower Extremity / Q000502:physiology*; D008297:Male; D063806:Myalgia / Q000209:etiology; D010807:Physical Endurance; D055070:Resistance Training / Q000009:adverse effects / Q000379:methods*; D012420:Running / Q000502:physiology*; D013739:Testosterone / Q000097:blood; D055815:Young Adult
chemical_list: D006728:Hormones; D013739:Testosterone; D003402:Creatine Kinase; D006854:Hydrocortisone
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