Nevill et al. (1993) Effect of diet on performance during recovery from intermitent sprint exercise

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Effect of diet on performance during recovery from intermitent sprint exercise

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CONTRIBUTORS:

	Author:	Nevill, M. E.
	Author:	Williams, C.
	Author:	Roper, D.
	Author:	Slater, C.
	Author:	Nevill, A. M. (University of Wolverhampton)

JOURNAL:

Journal of Sports Sciences (JSS), 11(2), ?? - ??.

YEAR:

1993

PUB TYPE:

Journal Article

SUBJECT(S):

CARBOHYDRATE; BLOOD; LACTATE; GLUCOSE; ADAPTATION; ACHIEVEMENT; RECOVERY; EXERCISE; SPRINTING

DISCIPLINE:

No discipline assigned

HTTP:

LANGUAGE:

English

PUB ID:

103-366-380 (Last edited on 2002/02/27 18:45:01 US/Mountain)

SPONSOR(S):

ABSTRACT:
Eighteen game players (9 males, 9 females) performed 30 maximum 6-s sprints on a non-motorized treadmill. Each sprint was preceded by a 60-s jog at 40 percent maximum speed and was followed by a 54-s walk at 20 percent maximum speed. Thus, the entire test was of 60-min duration. The subjects were then randomly assigned to three groups and repeated the 1-h test 24 h later after consuming either a high, normal or low carbohydrate diet (79 plus/minus 3, 47 plus/minus 8, 12 plus/minus 1 percent CHO, respectively). During trial 1, mean power output declined from 653 plus/minus 131 to 600 plus/minus 158 W during the 30 sprints and power output was lower during trial 2 than during trial 1 (n=18, P less than 0.01). During trial 2, there were no differences in sprint performance between the dietary groups for the exercise test as a whole (trial 2 mean power lower than trial 1 by 0.2, 0.5 and 5.0 percent for the high, normal and low CHO groups, respectively; N.S.), but if only the first nine sprints are considered, then the high CHO group performed better than the low CHO group. Blood lactate and glucose concentrations were lower during trial 2 than trial 1 by 4.5, 13.8 and 29.0 percent (lactate) and 14.9, 11.3 and 35.8 percent (glucose) for the high, normal and low CHO groups, respectively (both P less than 0.01). Thus, both the metabolic responses to, and the performance of, maximum intermittent exercise were reduced when the test was repeated after 24 h recovery. In addition, both the performance and the metabolic responses to test 2 were altered by dietary manipulation in the intervening period.

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