This preview shows page 1. Sign up to view the full content.
Unformatted text preview: es of
5g of Cr + 1g of glucose for the Cr group and four
doses of 6g glucose for placebo condition. Testing
consisted of five sets of 30 maximal volitional contractions with a 1-minute rest period between sets.
Peak torque measurements were taken during each
of the 30 contractions, with the average value being
used in the analyses. Peak torque declined from sets
one to four, with no difference seen between sets
four and five. A three-way ANOVA determined that
there were no significant group, time or interaction
effects, suggesting that acute Cr supplementation
did not significantly affect indices of isokinetic torque production at a constant velocity of 180 degrees/
Isokinetic studies with Cr supplementation in
older populations have produced differing results
from younger or athletic populations. Rawson and
Clarkson randomly assigned 17 men between the
ages of 60 and 78 years to either a Cr group (5g + 1g
sucrose four times daily for 5 days) or a placebo
group (6g sucrose four times daily for 5 days). Prior
to testing and following 5 days of Cr loading, subjects performed an intermittent isokinetic fatigue 2005 Adis Data Information BV. All rights reserved. 115 test of the knee extensors, which involved three sets
of 30 maximal volitional actions at 180 degrees/
second interspaced with 60 seconds of recovery.
Each group was analysed separately with a two-way
ANOVA. There was no significant interaction term
for isokinetic performance for either group indicating that Cr did not exhibit a performance-enhancing
effect for older men perhaps due to poorer Cr absorption, transportation or uptake by the muscle.
Chrusch et al. examined the effects of combined Cr ingestion and resistance training (36 total
training sessions) on isokinetic muscle performance
in older men. Thirty subjects were randomly assigned to either a Cr group (n = 6; mean age 70.4 ±
1.6 years) or a placebo group (n = 14; mean age 71.1
± 1.8 years). The Cr loading phase consisted of 0.3
g/kg BW for the first 5 days,...
View Full Document