title: The effects of a resistance-training program on strength, body composition and baseline hormones in male athletes training concurrently for rugby union 7's.
abstract: OBJECTIVE
  To examine the effects of a resistance-training program on strength, body composition and baseline hormones in male athletes training concurrently for rugby union 7's.
  
  
  METHODS
  Participants (N.=12) completed a six-week resistance-training program focusing on general strength development while still performing additional rugby union 7's training involving agility, speed and cardiovascular fitness. One repetition maximum (1RM) strength was assessed pre and post training across 5 exercises (bench press, back squats, deadlifts, military press and chins), along with body composition and baseline salivary testosterone (T) and cortisol (C) concentrations.
  
  
  RESULTS
  Significant improvements in bench press (11%), back squat (13%), deadlift (13%), military press (10%) and chin-up (6%) 1RM strength were observed after training (P < 0.05). These changes were accompanied by a significant reduction (-1%) in body fat and an increase (1.3%) in fat-free mass. Baseline T and C concentrations and the T/C ratio did not change significantly with training (P>0.05). Correlational analyses indicated that most of the individual changes in strength, body composition and hormones were not significantly related.
  
  
  CONCLUSIONS
  The implementation of a resistance-training program in male athletes already training for rugby union 7's led to all-round improvements in maximal dynamic strength even while they continued to perform other forms of rugby-specific training. These findings support the use of resistance exercise as a supplement to sport-specific training for improving the performance capacity of 7's rugby players.
authors.affiliation: Hamlyn Centre, Imperial College, London, UK. bcrewthe@imperial.ac.uk
authors.forename: B T
authors.initials: BT
authors.lastname: Crewther
authors.forename: T L
authors.initials: TL
authors.lastname: Heke
authors.forename: J W
authors.initials: JW
authors.lastname: Keogh
mesh_terms: D054874:Athletic Performance / Q000502:physiology; D050218:Body Fat Distribution; D005538:Football / Q000502:physiology; D006801:Humans; D006854:Hydrocortisone / Q000032:analysis*; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D055070:Resistance Training; D012463:Saliva / Q000737:chemistry; D013739:Testosterone / Q000032:analysis*; D055815:Young Adult
chemical_list: D013739:Testosterone; D006854:Hydrocortisone