Heart rate, blood lactate and kinematic data of elite colts (under-19) rugby union players during competition
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1998
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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RUGBY-UNION; HEART-RATE; LACTATE; KINEMATIC; ELITE-ATHLETE; COMPETITION; ADOLESCENT; BOY
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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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103-366-590
(Last edited on
2002/02/27 18:44:59 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
Physiological and kinematic data were collected from elite under-19 rugby union players to provide a greater understanding of the physical demands of rugby union. Heart rate, blood lactate and time-motion analysis data were collected from 24 players (mean plus/minus s mean: body mass 88.7 plus/minus 9.9 kg, height 185 plus/minus 7 cm, age 18.4 plus/minus 0.5 years) during six competitive premiership fixtures. Six players were chosen at random from each of four groups: props and locks, back row forwards, inside backs, outside backs. Heart rate records were classified based on percent time spent in four zones (greater than 95 percent, 85-95 percent, 75-84 percent, less than 75 percent HRmax). Blood lactate concentration was measured periodically throughout each match, with movements being classified as standing, walking, jogging, cruising, sprinting, utility, rucking/mauling and scrummaging. The heart rate data indicated that props and locks (58.4 percent) and back row forwards (56.2 percent) spent significantly more time in high exertion (85-95 percent HRmax) than inside backs (40.5 percent) and outside backs (33.9 percent) (P is less than 0.001). Inside backs (36.5 percent) and outside backs (38.5 percent) spent significantly more time in moderate exertion (75-84 percent HRmax) than props and locks (22.6 percent) anmd back row forwards (19.8 percent). Outside backs (20.1 percent) spent significantly more time in low exertion (less than 75 percent HRmax) than props and locks (5.8 percent) and back row forwards (5.6 percent). Mean blood lactate concentration did not differ significantly between groups (range: 4.67 mmol.l-1 for outside backs to 7.22 mmol.l-1 for back row forwards; P is less than 0.05). The motion analysis data indicated that outside backs (5750 m) covered a significantly greater total distance than either props and locks or back row forwards (4400 and 4080 m, respectively; P is less than 0.05). Inside backs and outside backs covered significantly greater distances walking (1740 and 1780 m, respectively; P is less than 0.001), in utility movements (417 and 475 m, respectively; P is less than 0.001) and sprinting (208 and 340 m, respectively: P is less than 0.001) than either props and locks or back row forwards (walking: 1000 and 991 m; utility movements: 106 and 154 m; sprinting: 72 and 94 m, respectively). Outside backs covered a significantly greater distance sprinting than inside backs (208 and 340 m, respectively; P is less than 0.001). Forwards maintained a higher level of exertion than backs, due to more constant motion and a large involvement in static high-intensity activities. A mean blood lactate concentration of 4.8-7.2 mmol.l-1 indicated a need for "lactate tolerance" training to improve hydrogen ion buffering and facilitate removal following high-intensity efforts. Furthermore, the large distances (4.2-5.6 km) covered during, and intermittent nature of, match-play indicated a need for sound aerobic conditioning in all groups (particularly backs) to minimize fatigue and facilitate recovery between high-intensity efforts.
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