Effects of creatine on isometric bench-press performance in resistance-trained humans

Abstract

Five days of Cr supplementation increased body weight and fat-free body mass in resistance-trained men who were classified as responders. Peak force and total force during a repeated maximal isometric bench-press test were also significantly greater in the responders compared to the placebo group.

The effects of creatine supplementation on thermoregulation and physical (cognitive) performance: a review and future prospects

“…kg -1 dry muscle weight, respectively. This ratio of responders to nonresponders (Kilduff et al 2003) is in agreement with our previous study (Kilduff et al 2002) and these results implicate other factors in addition to diet, Cr dose, training status and training experience. Muscle Cr uptake has been reported to increase from 118.1 mmol .…”

“…However, very little of this research addressing the responders issue has involved human studies and has focused primarily on animal models. The issue of responders and nonresponders to Cr supplementation has been well documented (Greenhaff et al 1994, Kilduff et al 2002, Kilduff et al 2003 however, in comparing responders against nonresponders, responders have lower pre-supplementation CrT (Harris et al 1992) and potentially a longer history of resistance training (MacDougall et al 1977). Novel approaches are needed to resolve this important issue such as the use of investigations conducted in particular clinical patient groups.…”

“…Increase in 1 repetition maximum following acute supplementation Increase in lean body mass, lean tissue mass and improved lower body strength in older men Increase in peak athletic performance following 5 days of low or high dose supplementation Increase in peak force per repetition and overall force production during isometric bench press performance Increase in isokinetic force and torque Maintenance of isokinetic muscle performance following 3.0-4.3% reduction in body mass compared to placebo in resistance trained subjects Aerobic performance and thermoregulation Rossouw et al 2000Chrusch et al 2001Harris et al 1992Bemben et al 2001;Wilder et al 2001;Wilder et al 2002Kilduff et al 2002Kilduff et al 2003Oopik et al 1998 Slowing of on-transient oxygen (…”

Efectos de la ingestión de creatinina en la composición corporal y en la performance del ejercicio supino

“…Izquierdo (1998) al efectuar un suplemento con Cr durante cinco días, utilizando la dosis diaria de 20g, obtuvo como resultado un aumento de 0,6 kg en la MCT. Kilduff (2002) describió un aumento de 1,2 kg utilizando las dosis de 20 gramos diarios por cinco días. Huso (2002), también utilizando una dosifi cación de 20 gramos diarios por cinco días y una dosis de manutención (dos gramos por 17 días) obtuvo un aumento de 1,6 Kg en la MCT.…”

Creatine Supplementation and Athletic Performance

“…Furthermore, while many individuals derive benefit from Cr supplementation, others appear to be nonresponders, which may be explained by the variability in skeletal muscle accumulation of Cr with supplementation. 11,21,32 Additional research is necessary to better understand and predict the circumstances in which Cr supplementation is most likely to enhance athletic performance.…”