Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Porto, Portugal.
Porto Biomechanics Laboratory, Faculty of Sport, University of Porto, Porto, Portugal.
Int J Sports Med. 2023 Dec;44(14):1043-1048. doi: 10.1055/a-1990-9787. Epub 2022 Nov 30.
Empirical observations support that the addition of a plastic strip - also known as Randall foils - on the top edge of a rowing blade improves rowing efficiency during the cycle propulsive phase. The aim of the current study was to analyze the effect of using big blades with and without Randall foils on rowing performance. Twenty experienced rowers performed two 90 s tethered rowing bouts (with and without Randall foils) to assess their impact on force production and physiologic variables. All tests were randomized and a repeated measure design was used to compare experimental conditions. Higher values of peak and mean peak forces (479.4±134.7 vs. 423.2±153.0, =0.83 and 376.5±101.4 vs. 337.1±113.3 N, =0.68), peak oxygen uptake (47.9±7.5 vs. 45.3±7.3 mL∙kg∙min, =0.19), peak blood lactate concentration (7.9±1.6 vs. 6.9±1.7 mmol∙L, =0.16), blood lactate increasing speed (0.08±0.01 vs. 0.07±0.06 [(mmol·L)·s], =0.27) and lactic anaerobic energy (27.4±7.9 vs. 23.4±8.1 kJ, =0.23) were found for big blades with vs. without Randall foils, p<0.05. The current data suggest that the Randall foils can positively affect rowing performance.
经验观察支持在划船桨的上边缘添加塑料条（也称为 Randall 箔片）可以提高划桨周期推进阶段的效率。本研究的目的是分析使用带和不带 Randall 箔片的大桨对划桨性能的影响。20 名有经验的桨手进行了两次 90 秒的系绳划船比赛（带和不带 Randall 箔片），以评估它们对力量产生和生理变量的影响。所有测试均为随机，采用重复测量设计来比较实验条件。峰值和平均峰值力（479.4±134.7 与 423.2±153.0，=0.83 和 376.5±101.4 与 337.1±113.3 N，=0.68）、峰值耗氧量（47.9±7.5 与 45.3±7.3 mL·kg·min，=0.19）、峰值血乳酸浓度（7.9±1.6 与 6.9±1.7 mmol·L，=0.16）、血乳酸增加速度（0.08±0.01 与 0.07±0.06 [(mmol·L)·s]，=0.27）和乳酸无氧能量（27.4±7.9 与 23.4±8.1 kJ，=0.23）在带和不带 Randall 箔片的大桨之间存在显著差异（p<0.05）。当前的数据表明，Randall 箔片可以对划桨性能产生积极影响。
