Effect of Running Intensity on Leg Force Asymmetry and its Relationship to Internal Load Biomarkers

Author(s)

Sousa, Filipe ; Rodrigues, Natalia ; Manchado-Gobatto, Fulvia ; Gobatto, Claudio ; IEEE

• Document type: Journal article
• Source: 2020 IEEE INTERNATIONAL WORKSHOP ON METROLOGY FOR INDUSTRY 4.0 & IOT (METROIND4.0&IOT); v. N/A, p. 6-pg., 2020-01-01.

Abstract

Higher leg force asymmetry had been linked to increased energy expenditure during long-distance running. Muscle fatigue would be expected to influence leg force asymmetry during the effort due to its influence on coordination, but previous studies failed to show this effect. Considering the influence of exercise intensity on fatigue, leg force asymmetry progression may be intensity-dependent. This study aims to investigate the effect of running intensity on the leg force asymmetry in the vertical and horizontal orientations and their relationship to a physiological response. Nine recreational long-distance runners were submitted to three test sessions interspaced by 48-72 hours on an instrumented non-motorized treadmill, consisting of an incremental test and three constant intensity efforts, below RCP, at RCP and above VO2max (38.1 +/- 10.9, 59.8 +/- 14.7, and 126.7 +/- 11.8 % of the VO2max, respectively). Results shows a significant effect of intensity on leg force asymmetry in the horizontal orientation (p = 0.04; eta p(2) = 0.167), but not in the vertical orientation (p = 0.14; eta p(2) = 0.067). Leg asymmetries do not tend to progress along with the effort, irrespective of force orientation or the intensities included here (p > 0.97; eta p(2) < 0.011 for time). However, the association between leg force asymmetry and biomarkers of physiological stress may be intensity-dependent, with the intensity at RCP showing the stronger coefficient of determination between the studied variables (R-2 between 0.52 and 0.93) compared to the other intensities (R-2 between 0.08 to 0.16). (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