Physiological responses to 90 min of simulated dinghy sailing
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1994
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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YACHTING; ISOMETRIC; PHYSIOLOGY; ADAPTATION; SIMULATION; COMPARATIVE-STUDY; ADOLESCENT; YOUNG-ADULT; HEART-RATE; BLOOD-PRESSURE; HIKING
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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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103-366-408
(Last edited on
2006/05/07 08:57:31 GMT-6)
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SPONSOR(S):
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ABSTRACT:
A dinghy sailing race protocol was developed from video analysis of elite Laser class sailors competing in fairly windy (greater than 12 knots) national level races. A dinghy sailing ergometer was constructed for use with a 90 min protocol. Subjects watched a video of a Laser dinghy skipper sailing (on-water) according to the protocol while themselves hiking (leaning out) from the ergometer and simulating their normal on-water movements in tandem with the video. This simulation was used a examine physiological responses to dinghy sailing and factors correlated with hiking performance in 10 of Australia's top 30 Laser dinghy sailors. Simulated dinghy sailing elicited a large blood pressure response but a low rate of aerobic and anaerobic metabolism. During the 20 min upwind legs, the mean (plus/minus S.E.M.) systolic and diastolic blood pressures were 172 plus/minus 18 and 100 plus/minus 14 mmHg respectively, and mean arterial blood pressure (MABP) was 123 plus/minus 14 mmHg. Oxygen uptake during the simulated upwind legs was 2.32 plus/minus 0.81 mM. Isometric knee extension strength (at 130 degrees) and the length to which subjects set the hiking strap on the ergometer were moderately related to upwind hiking performance (knee extension strength and upwind hiking strap tension, r=0.62; hiking strap length and upwind righting moment, r=0.66; both P less than 0.05). Thus, a number of factors, including strength, hiking strap length and cardiovascular fitness, apparently determined righting moment and hiking strap tension during Laser sailing. It is suggested that it is only the discontinuous nature of hiking which allows dinghy sailors to sustain the isometric contractions for extended periods.
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