Advertisement

European Journal of Applied Physiology

, Volume 83, Issue 1, pp 89–94 | Cite as

Creatine supplementation alters the response to a graded cycle ergometer test

  • Arnold G. Nelson
  • Randy Day
  • Ellen L. Glickman-Weiss
  • Maren Hegsted
  • Joke Kokkonen
  • B. Sampson
ORIGINAL ARTICLE

Abstract

To determine the effects of creatine supplementation on cardiorespiratory responses during a graded exercise test (GXT) 36 trained adults (20 male, 16 female; 21–27 years old) performed two maximal GXTs on a cycle ergometer. The first GXT was done in a non-supplemented condition, and the second GXT was done following 7 days of ingesting either 5 g creatine monohydrate, encased in gelatin capsules, four times daily (CS, 13 male, 6 female), or the same number of glucose capsules (PL, 7 male, 10 female). CS significantly (P < 0.05) improved total test time [pre-CS=1217 (240) s, mean (std. dev.) versus post-CS=1289 (215) s], while PL administration had no effect (P > 0.05) on total test time [pre-PL=1037 (181) s versus post-PL=1047 (172) s]. In addition, both oxygen consumption (O2) and heart rate at the end of each of the first five GXT stages were significantly lower after CS, but were unchanged after PL. Moreover, the ventilatory threshold occurred at a significantly greater O2 for CS [pre-CS=2.2 (0.4) l · min−1 or 66% of peak O2 versus post-CS=2.6 (0.5) l · min−1 or 78% of peak O2; pre-PL=2.6 (0.9) l · min−1 or 70% peak O2 versus post-PL=2.6 (1.1) l · min−1 or 68% of peak O2]. Neither CS nor PL had an effect on peak O2 [pre-CS=3.4 (0.7) l · min−1 versus post-CS=3.3 (0.7) l · min−1; pre-PL=3.7 (1.1) l · min−1 versus post-PL=3.7 (1.1) l · min−1]. Apparently, CS can alter the contributions of the different metabolic systems during the initial stages of a GXT. Thus, the body is able to perform the sub-maximal workloads at a lower oxygen cost with a concomitant reduction in the work performed by the cardiovascular system.

Key words Heart rate Oxygen consumption Ventilatory threshold 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Arnold G. Nelson
    • 1
  • Randy Day
    • 2
  • Ellen L. Glickman-Weiss
    • 3
  • Maren Hegsted
    • 4
  • Joke Kokkonen
    • 5
  • B. Sampson
    • 2
  1. 1.Department of Kinesiology, Louisiana State University, 112 Long Field House, Louisiana State University, Baton Rouge, LA 70803, USA e-mail: anelso@lsu.edu Tel.: +1-225-388-3114, Fax: +1-225-388-3680US
  2. 2.Division of Math and Science, Brigham Young University-Hawaii, Laie, HI 96762, USAUS
  3. 3.School of Exercise, Leisure and Sport, Kent State University, Kent, OH 44242, USAUS
  4. 4.Department of Human Ecology, Louisiana State University, Baton Rouge, LA 70803, USAUS
  5. 5.Division of Physical Education, Brigham Young University-Hawaii, Laie, HI 96762, USAUS

Personalised recommendations