Physiological responses to maximal intermittent exercise: differences between endurance-trained runners and games players
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1991
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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COMPARATIVE-STUDY; SPRINTING; ACHIEVEMENT; LACTATE; BLOOD; RECOVERY; HYDROGEN-ION-CONCENTRATION
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DISCIPLINE:
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No discipline assigned
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-366-305
(Last edited on
2002/02/27 18:45:08 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
Six games players (GP) and six endurance-trained runner (ET) completed a standardized multiple sprint test on a non-motorized treadmill consisting of ten 6-s all-out sprints with 30-s recovery periods. Running speed, power output and oxygen uptake were determined during the test and blood samples were taken for the determination of blood lactate and pH. Games players tended to produce a higher peak power output (GP vs ET: 839 plus/minus 114 vs 777 plus/minus 89 W, N.S.) higher peak speed (GP vs ET: 7.03 plus/minus 0.3 vs 6.71 plus/minus 0.3 m s-1, N.S.), but had a greater decrement in mean power output than endurance-trained runners (GP vs ET: 29.3 plus/minus 8.1 percent vs 14.2 plus/minus 11.1 percent). Blood lactate after the test was higher for the games players (GP vs ET: 0.31 plus/minus 0.08 vs 0.28 plus/minus 0.08, N.S.). Strong correlations were found between peak blood lactate and peak speed (r=0.90, P less than 0.01) and between peak blood lactate and peak power fatigue (r=0.92, P less than 0.01). The average increase in oxygen uptake above pre-exercise levels during the sprint test was greater for endurance-trained athletes than for the games players (ET vs GP: 35.0 plus/minus 2.2 vs 29.6 plus/minus 3.0 ml kg-1min-1, P less than 0.05), corresponding to an average oxygen uptake per sprint (6-s sprint and 24 s of subsequent recovery) of 67.5 plus/minus 2.9 percent and 63.0 plus/minus 4.5 percent VO2max respectively (N.S.). A modest relationship existed between the average increase in oxygen uptake above pre-exercise values during the sprint test and mean speed fatigue (r= -0.68, P less than 0.05). Thus, the greater decrement in performance for the games players may be related to higher glycolytic rates as reflected by higher lactate concentrations and to their lower oxygen uptake during the course of the 10 sprints.
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