Abstract
This study examined the effect of amino acids in a carbohydrate beverage on cycling performance. Twelve male athletes (28.5 ± 2.1 yr) cycled at 75% VO2peak for 90 min followed by a ride to exhaustion at 85% VO 2peak, before (Tl) and on 2 consecutive days (T2 and T3) after 2 weeks of supplementation with 3.6% carbohydrate plus 1% amino acids (AA) or 4.6% carbohydrate-only (CHO) isocaloric beverages. Muscle damage was assessed by plasma creatine kinase (CK), and muscle fatigue by changes in vertical jump pre- to postexercise. Muscle soreness, overall fatigue, and changes in mood state were assessed using questionnaires. Plasma CK was lower for AA in T3 (214.0 ± 13.5 vs. 485.9 ± 191.4 U/L immediately post, 213.9 ± 13.1 vs. 492.0 ± 199.4 U/L 5 hr post, and 194.9 ± 17.9 vs. 405.9 ± 166.6 U/L 24 hr postexercise in AA and CHO, respectively). Time to exhaustion decreased from T2 to T3 only in CHO (10.9 ± 2.5 to 12.6 ± 3.2 vs. 13.8 ± 2.8 to 7.8 ±1.5 min in AA and CHO, respectively). Vertical-jump change from pre- to postexercise was greater in T3 for the CHO treatment. Total fatigue score and mood disturbance decreased significantly only with AA in T3. The addition of AA to a carbohydrate beverage after consecutive-day exercise bouts reduced muscle damage as indicated by CK levels, decreased fatigue, and maintained exercise performance compared with consuming carbohydrate alone.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 473-492 |
| Number of pages | 20 |
| Journal | International Journal of Sport Nutrition and Exercise Metabolism |
| Volume | 18 |
| Issue number | 5 |
| State | Published - Oct 2008 |
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Keywords
- Creatine kinase
- Cycling
- Sports drink
- Time trial
ASJC Scopus subject areas
- Medicine (miscellaneous)
- Nutrition and Dietetics
- Orthopedics and Sports Medicine
Cite this
Effects of an amino acid-carbohydrate drink on exercise performance after consecutive-day exercise bouts. / Skillen, Rebecca A.; Testa, Massimo; Applegate, Elizabeth A.; Heiden, Eric A.; Fascetti, Andrea J; Casazza, Gretchen A.
In: International Journal of Sport Nutrition and Exercise Metabolism, Vol. 18, No. 5, 10.2008, p. 473-492.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of an amino acid-carbohydrate drink on exercise performance after consecutive-day exercise bouts
AU - Skillen, Rebecca A.
AU - Testa, Massimo
AU - Applegate, Elizabeth A.
AU - Heiden, Eric A.
AU - Fascetti, Andrea J
AU - Casazza, Gretchen A.
PY - 2008/10
Y1 - 2008/10
N2 - This study examined the effect of amino acids in a carbohydrate beverage on cycling performance. Twelve male athletes (28.5 ± 2.1 yr) cycled at 75% VO2peak for 90 min followed by a ride to exhaustion at 85% VO 2peak, before (Tl) and on 2 consecutive days (T2 and T3) after 2 weeks of supplementation with 3.6% carbohydrate plus 1% amino acids (AA) or 4.6% carbohydrate-only (CHO) isocaloric beverages. Muscle damage was assessed by plasma creatine kinase (CK), and muscle fatigue by changes in vertical jump pre- to postexercise. Muscle soreness, overall fatigue, and changes in mood state were assessed using questionnaires. Plasma CK was lower for AA in T3 (214.0 ± 13.5 vs. 485.9 ± 191.4 U/L immediately post, 213.9 ± 13.1 vs. 492.0 ± 199.4 U/L 5 hr post, and 194.9 ± 17.9 vs. 405.9 ± 166.6 U/L 24 hr postexercise in AA and CHO, respectively). Time to exhaustion decreased from T2 to T3 only in CHO (10.9 ± 2.5 to 12.6 ± 3.2 vs. 13.8 ± 2.8 to 7.8 ±1.5 min in AA and CHO, respectively). Vertical-jump change from pre- to postexercise was greater in T3 for the CHO treatment. Total fatigue score and mood disturbance decreased significantly only with AA in T3. The addition of AA to a carbohydrate beverage after consecutive-day exercise bouts reduced muscle damage as indicated by CK levels, decreased fatigue, and maintained exercise performance compared with consuming carbohydrate alone.
AB - This study examined the effect of amino acids in a carbohydrate beverage on cycling performance. Twelve male athletes (28.5 ± 2.1 yr) cycled at 75% VO2peak for 90 min followed by a ride to exhaustion at 85% VO 2peak, before (Tl) and on 2 consecutive days (T2 and T3) after 2 weeks of supplementation with 3.6% carbohydrate plus 1% amino acids (AA) or 4.6% carbohydrate-only (CHO) isocaloric beverages. Muscle damage was assessed by plasma creatine kinase (CK), and muscle fatigue by changes in vertical jump pre- to postexercise. Muscle soreness, overall fatigue, and changes in mood state were assessed using questionnaires. Plasma CK was lower for AA in T3 (214.0 ± 13.5 vs. 485.9 ± 191.4 U/L immediately post, 213.9 ± 13.1 vs. 492.0 ± 199.4 U/L 5 hr post, and 194.9 ± 17.9 vs. 405.9 ± 166.6 U/L 24 hr postexercise in AA and CHO, respectively). Time to exhaustion decreased from T2 to T3 only in CHO (10.9 ± 2.5 to 12.6 ± 3.2 vs. 13.8 ± 2.8 to 7.8 ±1.5 min in AA and CHO, respectively). Vertical-jump change from pre- to postexercise was greater in T3 for the CHO treatment. Total fatigue score and mood disturbance decreased significantly only with AA in T3. The addition of AA to a carbohydrate beverage after consecutive-day exercise bouts reduced muscle damage as indicated by CK levels, decreased fatigue, and maintained exercise performance compared with consuming carbohydrate alone.
KW - Creatine kinase
KW - Cycling
KW - Sports drink
KW - Time trial
UR - http://www.scopus.com/inward/record.url?scp=53549116763&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=53549116763&partnerID=8YFLogxK
M3 - Article
C2 - 19033610
AN - SCOPUS:53549116763
VL - 18
SP - 473
EP - 492
JO - International Journal of Sport Nutrition and Exercise Metabolism
JF - International Journal of Sport Nutrition and Exercise Metabolism
SN - 1526-484X
IS - 5
ER -