PMID- 16503677
OWN - NLM
STAT- MEDLINE
DCOM- 20060720
LR  - 20171116
IS  - 1064-8011 (Print)
IS  - 1064-8011 (Linking)
VI  - 20
IP  - 1
DP  - 2006 Feb
TI  - The effects of carbohydrate loading on repetitive jump squat power performance.
PG  - 167-71
AB  - The beneficial role of carbohydrate (CHO) supplementation in endurance exercise 
      is well documented. However, only few data are available on the effects of CHO 
      loading on resistance exercise performance. Because of the repetitive use of 
      high-threshold motor units, it was hypothesized that the power output 
      (power-endurance) of multiple sets of jump squats would be enhanced following a 
      high-CHO (6.5 g CHO kg body mass(-1)) diet compared to a moderate-CHO (4.4 g CHO 
      kg body mass(-1)) diet. Eight healthy men (mean +/- SD: age 26.3 +/- 2.6 years; 
      weight 73.0 +/- 6.3 kg; body fat 13.4 +/- 5.0%; height 178.2 +/- 6.1 cm) 
      participated in 2 randomly assigned counterbalanced supplementation periods of 4 
      days after having their free-living habitual diet monitored. The resistance 
      exercise test consisted of 4 sets of 12 repetitions of maximal-effort jump squats 
      using a Plyometric Power System unit and a load of 30% of 1 repetition maximum 
      (1RM). A 2-minute rest period was used between sets. Immediately before and after 
      the exercise test, a blood sample was obtained to determine the serum glucose and 
      blood lactate concentrations. No significant difference in power performance 
      existed between the 2 diets. As expected, there was a significant (p </= 0.05) 
      decrease in power performance between the repetitions in every set. Blood lactate 
      concentrations were significantly higher postexercise with both the high-CHO and 
      the moderate- or lower-CHO diet, but there were no differences between 
      conditions. The results indicated that the power output during multiple sets of 
      maximal jump squats was not enhanced following a higher-CHO diet compared to a 
      moderate- or lower-CHO diet. These data show that elevated carbohydrate intake is 
      not needed to optimize a repetitive power-endurance performance when it is done 
      as the first exercise in a workout.
FAU - Hatfield, Disa L
AU  - Hatfield DL
AD  - Human Performance Laboratory, Department of Kinesiology, University of 
      Connecticut, Storrs, 06269, USA.
FAU - Kraemer, William J
AU  - Kraemer WJ
FAU - Volek, Jeff S
AU  - Volek JS
FAU - Rubin, Martyn R
AU  - Rubin MR
FAU - Grebien, Bianca
AU  - Grebien B
FAU - Gomez, Ana L
AU  - Gomez AL
FAU - French, Duncan N
AU  - French DN
FAU - Scheett, Timothy P
AU  - Scheett TP
FAU - Ratamess, Nicholas A
AU  - Ratamess NA
FAU - Sharman, Matthew J
AU  - Sharman MJ
FAU - McGuigan, Michael R
AU  - McGuigan MR
FAU - Newton, Robert U
AU  - Newton RU
FAU - Hakkinen, Keijo
AU  - Hakkinen K
LA  - eng
PT  - Journal Article
PT  - Randomized Controlled Trial
PL  - United States
TA  - J Strength Cond Res
JT  - Journal of strength and conditioning research
JID - 9415084
RN  - 0 (Blood Glucose)
RN  - 0 (Dietary Carbohydrates)
RN  - 0 (Dietary Fiber)
RN  - 0 (Dietary Sucrose)
RN  - 33X04XA5AT (Lactic Acid)
SB  - IM
MH  - Adult
MH  - Blood Glucose/analysis
MH  - Cross-Over Studies
MH  - Dietary Carbohydrates/*administration & dosage
MH  - Dietary Fiber/administration & dosage
MH  - Dietary Sucrose/administration & dosage
MH  - Energy Intake
MH  - Humans
MH  - Lactic Acid/blood
MH  - Leg/*physiology
MH  - Male
MH  - Movement/*physiology
MH  - Muscle, Skeletal/physiology
MH  - Physical Endurance/physiology
EDAT- 2006/03/01 09:00
MHDA- 2006/07/21 09:00
CRDT- 2006/03/01 09:00
PHST- 2006/03/01 09:00 [pubmed]
PHST- 2006/07/21 09:00 [medline]
PHST- 2006/03/01 09:00 [entrez]
AID - R-18300 [pii]
AID - 10.1519/R-18300.1 [doi]
PST - ppublish
SO  - J Strength Cond Res. 2006 Feb;20(1):167-71. doi: 10.1519/R-18300.1.