Comparison of physiological responses of running on a nonmotorized and conventional motor-propelled treadmill at similar intensities

Author(s)

Sousa, Filipe A. B. ; Manchado-Gobatto, Fulvia B. ; de A. Rodrigues, Natalia ; de Araujo, Gustavo G. ; Gobatto, Claudio A.

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 12, n. 1, p. 9-pg., 2022-07-08.

Abstract

This study aimed to test the agreement of the incremental test's physiological responses between tethered running on a nonmotorized treadmill (NMT) to matched relative intensities while running on a conventional motorized treadmill (MT). Using a within-subject crossover design, nine male recreational runners (age = 22 +/- 5 years; height = 175 +/- 6 cm; weight = 68.0 +/- 16.6 kg) underwent two test sessions: one was an incremental intensity protocol on an MT; the other was on an instrumented NMT. Intensity thresholds at. (V)over dotO(2max), respiratory compensation point (iRCP), and lactate threshold (iLT) were registered for analysis, together with. (V)over dotO(2),. (V)over dotE, f(R), and blood lactate concentration ([Lac]). Comparisons were based on hypothesis testing (Student's T-test), effect sizes (Cohen's d), ICC, and Bland Altman analysis. Statistical significance was accepted at p < 0.05. Attained. (V)over dotO(2max) (MT = 52.2 +/- 7.3 mL.kg(-1).min(-1) vs NMT = 50.1 +/- 8.1 mL.kg(-1).min(-1)) and. (V)over dotO(2) at iRCP (MT = 46.3 +/- 7.2 mL.kg(-1).min(-1) vs NMT = 42.8 +/- 9.3 mL.kg(-1).min(-1)) were not different between ergometers (p = 0.15 and 0.13, respectively), with significant ICCs (0.84 and 0.70, respectively) and Pearson's correlations (r = 0.87 and 0.76, respectively). The [Lac] at iLT presented poor agreement between conditions. Significant correlations were found (r between 0.72 and 0.83) for relative power values of i(V)over dotO(2max) (6.56 +/- 1.28 W.kg(-1)), iRCP (4.38 +/- 1.50 W.kg(-1)), and iLT (4.15 +/- 1.29 W.kg(-1)) related to their counterpart obtained on MT. Results show that running on an NMT offers a higher glycolytic demand under the same relative internal load as running on an MT but with a similar aerobic response and correlated intensity determination. (AU)

• FAPESP's process: 09/08535-5 - Standardization and validity of aerobic and anaerobic tests in field and laboratory, using free, tethered and half-tethered running, in endurance and sprint runners
• Grantee: Claudio Alexandre Gobatto
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/06355-2 - Standardization of free and tethered specific tests to determine the aerobic and anaerobic parameters in slalom kayak: relationship with the performance
• Grantee: Fúlvia de Barros Manchado Gobatto
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/16710-7 - Validity and reliability of anaerobic power and capacity parameters derived from one test session in tethered running
• Grantee: Filipe Antônio de Barros Sousa
• Support Opportunities: Scholarships in Brazil - Doctorate