Biophysical Determinants of Front-Crawl Swimming at Moderate and Severe Intensities

被引:19
|
作者
Ribeiro, Joao [1 ]
Toubekis, Argyris G. [2 ]
Figueiredo, Pedro [3 ]
de Jesus, Kelly [1 ]
Toussaint, Huub M. [4 ]
Alves, Francisco [5 ]
Vilas-Boas, Joao P. [1 ]
Fernandes, Ricardo J. [1 ]
机构
[1] Univ Porto, Ctr Res Educ Innovat & Intervent Sport, Oporto, Portugal
[2] Kapodistrian Univ Athens, Dept Aquat Sports, Athens, Greece
[3] Univ Fed Rio Grande do Sul, Sch Phys Educ, Porto Alegre, RS, Brazil
[4] Amsterdam Univ Appl Sci, Sch Sports & Nutr, Amsterdam, Netherlands
[5] Univ Tecn Lisboa, Fac Human Movement, Lisbon, Portugal
关键词
kinematics; power; propelling efficiency; coordination; energy expenditure; LACTATE STEADY-STATE; PROPELLING EFFICIENCY; ARM COORDINATION; SWIMMERS; PERFORMANCE; THRESHOLD; EXERCISE; VELOCITY; DRAG; PARAMETERS;
D O I
10.1123/ijspp.2015-0766
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
To conduct a biophysical analysis of the factors associated with front-crawl performance at moderate and severe swimming intensities, represented by anaerobic-threshold (vAnT) and maximal-oxygen-uptake (vVO(2)max) velocities. Methods: Ten high-level swimmers performed 2 intermittent incremental tests of 7 x 200 and 12 x 25 m (through a system of underwater push-off pads) to assess vAnT, and vVO2max, and power output. The 1st protocol was videotaped (3D reconstruction) for kinematic analysis to assess stroke frequency (SF), stroke length (SL), propelling efficiency (eta(p)), and index of coordination (IdC). VO2 was measured and capillary blood samples (lactate concentrations) were collected, enabling computation of metabolic power. The 2nd protocol allowed calculating mechanical power and performance efficiency from the ratio of mechanical to metabolic power. Results: Neither vAnT nor vVO2max was explained by SF (0.56 +/- 0.06 vs 0.68 +/- 0.06 Hz), SL (2.29 +/- 0.21 vs 2.06 +/- 0.20 m), eta(p) (0.38 +/- 0.02 vs 0.36 +/- 0.03), IdC (-12.14 +/- 5.24 vs -9.61 +/- 5.49), or metabolic-power (1063.00 +/- 122.90 vs 1338.18 +/- 127.40 W) variability. vVO2max was explained by power to overcome drag (r = .77, P <= .05) and eta(p) (r =.72, P <= .05), in contrast with the nonassociation between these parameters and vAnT; both velocities were well related (r = .62, P <= 5.05). Conclusions: The biomechanical parameters, coordination, and metabolic power seemed not to be performance discriminative at either intensity. However, the increase in power to overcome drag, for the less metabolic input, should be the focus of any intervention that aims to improve performance at severe swimming intensity. This is also true for moderate intensities, as vAnT and vVO(2)max are proportional to each other.
引用
收藏
页码:241 / 246
页数:6
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