title: The Acute Effect of Concurrent Training on Running Performance Over 6 Days.
abstract: OBJECTIVE
  This study examined the effects of strength training on alternating days and endurance training on consecutive days on running performance for 6 days.
  
  
  METHODS
  Sixteen male and 8 female moderately trained individuals were evenly assigned into concurrent-training (CCT) and strength-training (ST) groups. The CCT group undertook strength training on alternating days combined with endurance training on consecutive days for 6 days. One week later, the CCT group conducted 3 consecutive days of endurance training only to determine whether fatigue would be induced with endurance training alone (CCT-Con). Endurance training was undertaken to induce endurance-training stimulus and to measure the cost of running (CR), rating of perceived exertion (RPE), and time to exhaustion (TTE). The ST group undertook 3 strength-training sessions on alternating days. Maximal voluntary contraction (MVC), rating of muscle soreness (RMS), and rating of muscle fatigue (RMF) were collected prior to each strength and endurance session.
  
  
  RESULTS
  For the CCT group, small differences were primarily found in CR and RPE (ES = 0.17-0.41). However, moderate-to-large reductions were found for TTE and MVC (ES = 0.65-2.00), whereas large increases in RMS and RMF (ES = 1.23-2.49) were found prior to each strength- and endurance-training session. Small differences were found in MVC for the ST group (ES = 0.11) and during CCT-Con for the CCT group (ES = 0.15-0.31).
  
  
  CONCLUSIONS
  Combining strength training on alternating days with endurance training on consecutive days impairs MVC and running performance at maximal effort and increases RMS and RMF over 6 days.
authors.affiliation: a James Cook University.
authors.forename: Kenji
authors.initials: K
authors.lastname: Doma
authors.affiliation: a James Cook University.
authors.forename: Glen
authors.initials: G
authors.lastname: Deakin
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D009119:Muscle Contraction; D018763:Muscle Fatigue / Q000502:physiology; D053580:Muscle Strength / Q000502:physiology; D063806:Myalgia / Q000503:physiopathology; D010465:Perception; D010806:Physical Education and Training / Q000379:methods*; D010807:Physical Endurance / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology; D055070:Resistance Training; D012420:Running / Q000502:physiology*
keywords: endurance training; running economy; running time to exhaustion; strength training