This preview shows page 1. Sign up to view the full content.
Unformatted text preview: p was divided into responders and nonresponders based on estimated intramuscular Cr
storage after loading, peak isometric force and total
force production was significantly higher than the
placebo group. It was reported that Cr uptake was
inversely proportional to training status (r = –0.68)
suggesting that less-trained individuals uptake Cr
more readily than more highly trained individuals. This could be due to the near saturation of
intramuscular Cr stores seen in highly trained individuals, probably through ingesting increased
amounts of dietary protein in the form of red meat.
Less-trained individuals may not actively seek to
increase protein intake and, therefore, may have
lower levels of saturation before Cr supplementation. Additionally, higher intramuscular Cr stores
may also be a physiological adaptation to highintensity resistance training. It should be noted that
by partitioning the Cr group into responders and
non-responders, a very different data interpretation
resulted and, as such, this method may be considered biased reporting of the data and should be
2.1.4 Eccentric Induced Muscle Soreness/Damage Eccentric action induces muscle soreness and
damage at both the sarcolemmal and sarcoplasmic
reticular membranes.[59,60] A change in sarcoplasmic
reticulum activity can lead to an increase in proteolytic enzymes, ultimately leading to contractile protein degradation. PCr has been associated with 2005 Adis Data Information BV. All rights reserved. membrane stabilisation leading to the notion that
Cr supplementation may help lessen the degenerative effects of eccentrically induced muscle damage.
In one of the few published articles in this area,
Rawson et al. investigated the effects of Cr supplementation on eccentrically induced muscle damage. Twenty-three men aged between 18 and 36
years were randomly assigned to either a Cr (n = 12;
20 g/day for 5 days) or placebo group (n = 11). Fifty
maximal eccentric contractions of the elbow flexors
were used to induce muscle damage and elbow
flexor MVC, elbow range of motion, blood creatine
kinase, lactate dehydrogenase, distal arm circumference, and soreness with movement and palpation
were assessed. There were no significant...
View Full Document