English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Purpose: To present a new method for determining the individual Lactate Threshold velocity (LTv) in trained swimmers using the intercept and slope (YIS) of the Lactate-Velocity curve (La-V). Methods: Forty-two national-level swimmers undertook a 7 × 200 m discontinuous incremental swimming step test. The LTv was determined by a mathematical formula that calculated the Lactate Threshold (LTv) as a function of the y-intercept and slope of the Lactate-Velocity curve (YIS method, where LTv = -0.217 x [y-intercept (La-V)/slope (LaV)] and compared to an existing Fixed Slope (FSM) Method, which had been seen to be the most consistent of 4 methods and used a similar slope protocol. Subsequently, on three occasions over a six-week period, using twelve different swimmers, the method of determining LTv was compared to three practical methods of validating the LTv: a 2000 m time trial, 24 × 100 m, and 10 × 300 m swim sets. Results: The slope of the La-V curve for Freestyle was significantly different between YIS and FSM (p = 0.03). The mean lactate at LT with the YIS method (3.2 ± 0.4 mM) was significantly lower than FSM (3.4 ± 0.3 mM). Swim velocity at LT was not significantly different between YIS and the FSM, p = 0.40. Conclusions: The YIS method for determining the LT and LTv, derived from the 7 × 200 m incremental step test, provides an objective means of quantifying the lactate threshold in swimmers.

Identification and Validation of the Lactate Threshold Velocity using the Y-Intercept and Slope of the Fit Curve (YIS Method)