TY - JOUR AU - Hurst, Howard Thomas AU - Sinclair, Jonathan AU - Beenham, Mathew PY - 2014/06/30 Y2 - 2024/03/29 TI - Influence of Absolute versus relative L-arginine Dosage on 1 km and 16.1 km time trial performance in trained cyclists. JF - Journal of Science and Cycling JA - J Sci Cycling VL - 3 IS - 1 SE - DO - UR - https://jsc-journal.com/index.php/JSC/article/view/68 SP - 2-8 AB - <span style="font-family: Times New Roman; font-size: small;"> </span><p>This investigation aimed to determine the effects of L-arginine supplementation on cycling time trial (TT) performance. Eight trained male cyclists performed 1 and 16.1km time trials on three occasions, control (CON), absolute (ABS) and relative (REL) loading. Participants consumed 500ml of water with either 6g (ABS), 0.15 g·kg<sup>-1</sup> body mass (REL) of L-arginine or water (CON) 90min prior to testing. Time to completion, mean power output (W<sub>mean</sub>) and post-exercise lactate (La) were recorded for each TT. Time to completion decreased non-significantly for 1 and 16.1km TT’s during ABS and REL trials compared to CON. W<sub>mean</sub> was significantly different between CON and REL during 16.1 km TT (196.19 ± 32.40W and 215.81 ± 31.56W). Blood lactates was significantly different between CON and ABS for the 1 km TT (<em>p</em> = 0.04) (13.59 ± 1.21 mmol·L<sup>-1</sup> and 12.38 ± 0.70 mmol·L<sup>-1</sup>, respectively) and between CON and ABS (<em>p</em> = 0.04) (9.11 ± 2.91mmol·L<sup>-1</sup> and 7.64 ± 3.01mmol·L<sup>-1</sup>, respectively) and CON and REL (9.11 ± 2.91mmol·L<sup>-1</sup> and 7.15 ± 2.96mmol·L<sup>-1</sup>, respectively) for 16.1km TT. These results indicate L-arginine supplementation does not significantly improve cycling TT performance, though there was a trend towards reduced time to completion and increased mean power output, and that relative doses appear more effective than absolute doses.</p><p class="MsoNormal" style="margin: 0cm 0cm 10pt; text-align: justify; line-height: 200%; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto;"> </p><span style="font-family: Times New Roman; font-size: small;"> </span> ER -