Medicine and science in sports and exercise · 2026
High Test-Retest Reliability but Questionable Validity: Assessing a Step-Ramp-Step Protocol to Estimate Critical Power and W ' in Trained Triathletes.
СтатьяВалидационное исследованиеНазвание и аннотация: Перевод в очереди
Обработка статьи · этапы, ошибки и управление
Загрузка состояния…
Ошибки и ограничения
История · было → стало
Состояние обновляется каждые 5 секунд, пока блок открыт. Процент показывается только там, где известен объём работы. Пауза останавливает продолжение этапа; текущий запрос к источнику может завершиться.
Rousseau Quentin, Rabita Giuseppe, Brunet Emmanuel, Dorel Sylvain, Siblot Adrian, Morales-Artacho Antonio J
Аннотация
PURPOSE: This study aimed to assess (1) the concurrent validity between critical power (CP) and the corrected power output at the respiratory compensation point (PO RCP ) and between W' and the quantity of energy depleted above PO RCP ( W'mod-SRS ) in a modified Step-Ramp-Step (mod-SRS) protocol; (2) the test-retest reliability of endurance variables derived from a mod-SRS protocol.
METHODS: Twelve trained male triathletes (31 ± 6 yr, 67.9 ± 7.1 mL min -1 kg -1 ) performed (1) an SRS protocol, (2) 4-5 severe-intensity constant work rate trials, (3) two mod-SRS protocols (test/retest), and (4) a heavy-intensity constant work rate trial. CP and W' were computed using a "best individual fit" approach. PO RCP was corrected appropriately, while W'mod-SRS was computed as the energy depleted above PO RCP . Test-retest reliability was assessed with the intraclass correlation coefficient (ICC), the standard error of measurement (SEM), and the coefficient of variation (CV%).
RESULTS: CP was higher than PO RCP in both trials (bias = 19 ± 19 W and 17 ± 20 W, P = 0.019 and 0.045). W' and W'mod-SRS were similar during both trials (bias = -2.8 ± 7.9 and -5.4 ± 8.8 kJ, P = 0.735 and 0.173). Test-retest reliability was moderate for W'mod-SRS (ICC = 0.66, SEM = 3.0 kJ, CV = 11.6%) and high for , gas exchange threshold (GET), RCP, and their associated PO values (ICCs = 0.85-0.95, SEMs = 68-184 mL min -1 , and 7-8 W, CVs = 2.1%-3.7%).
CONCLUSIONS: The mod-SRS protocol reliably measures , gas exchange threshold, and RCP. Corrected PO RCP systematically underestimated CP, which consequently impacts the computation of W' using a mod-SRS protocol. The design of the protocol may allow a more complete depletion of energy available above RCP while still eliciting .
METHODS: Twelve trained male triathletes (31 ± 6 yr, 67.9 ± 7.1 mL min -1 kg -1 ) performed (1) an SRS protocol, (2) 4-5 severe-intensity constant work rate trials, (3) two mod-SRS protocols (test/retest), and (4) a heavy-intensity constant work rate trial. CP and W' were computed using a "best individual fit" approach. PO RCP was corrected appropriately, while W'mod-SRS was computed as the energy depleted above PO RCP . Test-retest reliability was assessed with the intraclass correlation coefficient (ICC), the standard error of measurement (SEM), and the coefficient of variation (CV%).
RESULTS: CP was higher than PO RCP in both trials (bias = 19 ± 19 W and 17 ± 20 W, P = 0.019 and 0.045). W' and W'mod-SRS were similar during both trials (bias = -2.8 ± 7.9 and -5.4 ± 8.8 kJ, P = 0.735 and 0.173). Test-retest reliability was moderate for W'mod-SRS (ICC = 0.66, SEM = 3.0 kJ, CV = 11.6%) and high for , gas exchange threshold (GET), RCP, and their associated PO values (ICCs = 0.85-0.95, SEMs = 68-184 mL min -1 , and 7-8 W, CVs = 2.1%-3.7%).
CONCLUSIONS: The mod-SRS protocol reliably measures , gas exchange threshold, and RCP. Corrected PO RCP systematically underestimated CP, which consequently impacts the computation of W' using a mod-SRS protocol. The design of the protocol may allow a more complete depletion of energy available above RCP while still eliciting .