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      Creatine supplementation combined with resistance training in older men: body composition, muscular performance, and reported side effects

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      Chrusch_Murray_Justin_2001_sec.pdf (16.04Mb)
      Date
      2001
      Author
      Chrusch, Murray Justin
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      Purpose: To study the effect of creatine (Cr) supplementation combined with resistance training on muscular performance and body composition in older men. Methods: Thirty men were randomized to receive creatine supplementation (CRE, n = 16, age= 70.4 ± 1.6 y) or placebo (PLA, n = 14, age= 71.1 ± 1.8 y) using a double blind procedure for the entire length of study. Cr supplementation consisted of 0.3 g Cr·kg-1 body weight for the first 5 days (loading phase) and 0.07 g Cr·kg-1 body weight thereafter. Both groups participated in resistance training (36 sessions, 3 times per week, 3 sets of 10 repetitions, 12 exercises). Body composition measures were assessed at baseline (BL) and post-test (PT) periods, whereas performance measures were assessed at baseline (BL), mid-test (MT), and post-test (PT) periods. Lean tissue mass (LTM) and fat mass measures were assessed using DXA. Muscular strength was assessed by 1-repetition maximum (1-RM) for leg press (LP), knee extension (KE), and bench press (BP). Muscular endurance was assessed by the maximum number of repetitions over 3 sets (separated by 1-min rest intervals) at an intensity corresponding to 70% baseline 1-RM for BP and 80% baseline 1-RM for the KE and LP. Average power (AP) was assessed using a Biodex isokinetic knee extension-flexion exercise (3 sets of 10 repetitions at 60°·s separated by 1-min rest). Lean tissue (LTM) and fat mass were assessed. Side effects and treatment identification were assessed upon completion of the study. Results: Compared to PLA, the CRE group had significantly greater (p ≤ 0.05) increases in LTM (CRE, +3.3 kg; PLA, +1.3 kg), LP 1-RM (CRE, +50.1 kg; PLA +31.3 kg), KE 1-RM (CRE, +14.9 kg; PLA, +10.7 kg), LP endurance (CRE, +47 reps; PLA, +32 reps), KE endurance (CRE, +21 reps; PLA + 14 reps), and AP (CRE, +26.7 W; PLA, + 18 W). CRE group retrospectively reported experiencing loose stools, muscle cramping and decreased muscle soreness above that reported by PLA group. Changes in fat mass, fat percentage, BP 1-RM, and BP endurance were similar between groups. Conclusion: Creatine supplementation, when combined with resistance training, increases lean tissue mass and improves leg strength, endurance, and average power in men 60-84 years of age (mean age of 70 years). Possible side effects of the creatine supplementation include loose stools, muscle cramping, and decreased muscle soreness.
      Degree
      Master of Science (M.Sc.)
      Department
      College of Kinesiology
      Program
      College of Kinesiology
      Committee
      Zello, Gord; Chad, Karen; Chilibeck, Phil; Drinkwater, Don
      Copyright Date
      2001
      URI
      http://hdl.handle.net/10388/etd-08142012-144408
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      • Graduate Theses and Dissertations
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