TY - JOUR
T1 - Effects of creatine monohydrate and polyethylene glycosylated creatine supplementation on muscular strength, endurance, and power output
AU - Herda, Trent J.
AU - Beck, Travis W.
AU - Ryan, Eric D.
AU - Smith, Abbie E.
AU - Walter, Ashley A.
AU - Hartman, Michael J.
AU - Stout, Jeffrey R.
AU - Cramer, Joel T.
PY - 2009/5
Y1 - 2009/5
N2 - The purpose of this study was to examine the effects of a moderate dose of creatine monohydrate (CM) and two smaller doses of polyethylene glycosylated (PEG) creatine on muscular strength, endurance, and power output. Fifty-eight healthy men (mean ± SD: age, 21 ± 2 years; height, 176 ± 6 cm; body mass [BM], 75 ± 14 kg) volunteered and were randomly assigned to 1 of 4 groups: (a) placebo (PL; 3.6 g of microcrystalline cellulose; n = 15), (b) CM (5 g of creatine; n =13), (c) small-dose PEG creatine (1.25 g of creatine: PEG1.25; n = 14), or (d) moderatedose PEG creatine (2.50 g of creatine: PEG2.50; n = 16). Testing was conducted before (pre-) and after (post-) a 30-day supplementation period. Measurements included body mass, countermovement vertical jump (CVJ) height, power output during the Wingate test (peak power [PP] and mean power [MP]), 1 repetition maximum bench press (1RMBP), 1RM leg press (1RMLP) strength, and repetitions to failure at 80% of the 1RM for bench press (REPBP) and leg press (REPLP). BM and MP (W) increased (p ≤ 0.05) from pre- to postsupplementation for the CM group only, whereas 1RMBP and 1RMLP increased (p ≤ 0.05) for the CM, PEG1.25, and PEG2.50 groups. CVJ height (cm and cm-kg-1), MP (Wkg -1), PP (W and Wkg-1), REPBP, and REP LP increased (p ≤ 0.05) for all groups. These findings indicated that the recommended safe dose of 5 gd-1 of CM increased BM and improved muscle strength (1RMBP and 1RMLP). Smaller doses of PEG creatine (1.25 and 2.50 gd-1) improved muscle strength (1RMBP and 1RMLP) to the same extent as 5 gd-1 of CM, but did not alter BM, power output, or endurance. When compared to the PL group, neither CM nor PEG creatine supplementation improved peak power output (CVJ or PP), MP, or muscle endurance (REPBP or REPLP). Thus, PEG creatine may have ergogenic effects that are comparable to those of CM, but with a smaller dose of creatine.
AB - The purpose of this study was to examine the effects of a moderate dose of creatine monohydrate (CM) and two smaller doses of polyethylene glycosylated (PEG) creatine on muscular strength, endurance, and power output. Fifty-eight healthy men (mean ± SD: age, 21 ± 2 years; height, 176 ± 6 cm; body mass [BM], 75 ± 14 kg) volunteered and were randomly assigned to 1 of 4 groups: (a) placebo (PL; 3.6 g of microcrystalline cellulose; n = 15), (b) CM (5 g of creatine; n =13), (c) small-dose PEG creatine (1.25 g of creatine: PEG1.25; n = 14), or (d) moderatedose PEG creatine (2.50 g of creatine: PEG2.50; n = 16). Testing was conducted before (pre-) and after (post-) a 30-day supplementation period. Measurements included body mass, countermovement vertical jump (CVJ) height, power output during the Wingate test (peak power [PP] and mean power [MP]), 1 repetition maximum bench press (1RMBP), 1RM leg press (1RMLP) strength, and repetitions to failure at 80% of the 1RM for bench press (REPBP) and leg press (REPLP). BM and MP (W) increased (p ≤ 0.05) from pre- to postsupplementation for the CM group only, whereas 1RMBP and 1RMLP increased (p ≤ 0.05) for the CM, PEG1.25, and PEG2.50 groups. CVJ height (cm and cm-kg-1), MP (Wkg -1), PP (W and Wkg-1), REPBP, and REP LP increased (p ≤ 0.05) for all groups. These findings indicated that the recommended safe dose of 5 gd-1 of CM increased BM and improved muscle strength (1RMBP and 1RMLP). Smaller doses of PEG creatine (1.25 and 2.50 gd-1) improved muscle strength (1RMBP and 1RMLP) to the same extent as 5 gd-1 of CM, but did not alter BM, power output, or endurance. When compared to the PL group, neither CM nor PEG creatine supplementation improved peak power output (CVJ or PP), MP, or muscle endurance (REPBP or REPLP). Thus, PEG creatine may have ergogenic effects that are comparable to those of CM, but with a smaller dose of creatine.
KW - Bench press
KW - Countermovement vertical jump
KW - Leg press
KW - Wingate test
UR - http://www.scopus.com/inward/record.url?scp=68049122056&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=68049122056&partnerID=8YFLogxK
U2 - 10.1519/JSC.0b013e3181a2ed11
DO - 10.1519/JSC.0b013e3181a2ed11
M3 - Article
C2 - 19387397
AN - SCOPUS:68049122056
SN - 1064-8011
VL - 23
SP - 818
EP - 826
JO - Journal of strength and conditioning research
JF - Journal of strength and conditioning research
IS - 3
ER -