Abstract from:
1998 Australian Conference of Science and Medicine in Sport, Adelaide,
South Australia, October 1998.
Effect
of an oral bovine colostrum supplement
(intact TM ) on running performance
J Buckley*, M
Abbott, S Martin, G Brinkworth & P Whyte
Centre for Research
in Education and Sports Science,
University of South Australia
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Bovine colostrum
is secreted by cows during the first few days after calving and is
a rich source of bioactive components, including growth factors. Oral
supplementation with a whey fraction of bovine colostrum has been
shown to significantly increase serum insulin-like growth factor 1
(IGF-1) concentrations with no effect on vertical jump performance
(Mero et. al., 1997).
The present study
employed a double-blind, placebo controlled, parallel, randomised
design to determine the effect of supplementation with a low fat,
low lactose, concentrated bovine colostrum protein powder (intact?
, NorthField Laboratories Pty Ltd) on plasma IGF-1 concentrations
and endurance running performance.
After an initial
familiarisation period in the two weeks prior to commencement, 39
males, aged 18-35 years, completed an 8 week running program (3 x
45 minutes/week at lactate threshold) whilst consuming 60g/day on
intact TM bovine colostrum
(n=23, peak VO2 53.5 ¡À 1.1 ml.kg.1 min.1) or whey protein (n=16, peak
VO2 54.2 ¡À 1.7 ml.kg.1 .min.1 ).
All subjects
followed dietary guidelines provided by the researchers and kept food
diaries throughout the study period for subsequent dietary analysis.
Subjects completed 2 incremental treadmill running tests to exhaustion
(10 km/hr, incremented 1% grade every 3 min) separated by 20 minutes
of recovery at weeks 0, 4 and 8. There were no differences in plasma
IGF-1 concentrations between the groups at week 0 (colostrum 231.1
¡À 10.7 ng/ml, placebo 221.0 ¡À 13.3 ng/ml; P=0.37). Plasma IGF-1 concentrations
did not change in either group during the study period (P=0.90).
There were no
differences in the distance covered (m) or work done (kJ; vertical
distance covered x body mass x 9.81 m/s2 ) during the first (colostrum
4649 ¡À 238 m, 155.8 ¡À 15.7 kJ; placebo 4464 ¡À 320 m, 140.2 ¡À 19.6
kJ; P>0.46) or the second (colostrum 4044 ¡À 357 m, 120.6 ¡À 21.3
kJ; placebo 3942 ¡À 388 m, 110.7 ¡À 21.1 kJ; P>0.91) treadmill runs
at week 0. Distance covered and work done during the first treadmill
run increased in both groups during the study period (P<0.01),
but at similar rates (P>0.69).
During the second
treadmill run both groups exhibited similar increases in the distance
covered and work done from weeks 0-4 (P>0.20) but, from weeks 4-8
the intact TM colostrum group continued to improve whilst the performance
of the placebo group plateaued, such that by week 8 the colostrum
group ran further (colostrum 4662 ¡À 251 m, placebo 4237 ¡À 323 m; P=0.04)
and did more work than the placebo group (colostrum 150.7 ¡À 17.1 kJ,
placebo 124.2 ¡À 18.9 kJ; P=0.03). The TEM for running time (which
equates to distance covered and work done) was 2%.
There were no
differences in dietary intakes between the two groups. These results
indicate that oral supplementation with intact TM bovine colostrum
improves the ability to perform a second bout of maximal exercise
following a relatively short period of recovery from a prior bout
of maximal exercise.
Reference:
Mero, A., Miikkulainen, H., Riski, J., Pakkanen, R., Aalto, J., Takala,
T. (1997). Effects of bovine colostrum supplementation on serum IGF-1,
IgG, hormone and saliva IgA during training. J. Appl. Physiol. 83(4):
1144-1151.
Articles
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