Running fatiguing protocol affects peak torque joint angle and peak torque differently in hamstrings vs. quadriceps
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The aim of the current study was to investigate the effects of a running fatiguing protocol on the peak torque joint angle and the peak torque in hamstrings vs. quadriceps.
Twenty-one male runners underwent a running fatiguing protocol consisting of 40 min at a speed corresponding at first ventilatory threshold. Before and after the fatiguing protocol, isokinetic concentric and eccentric hamstrings and concentric quadriceps peak torque was measured at 60 and 300 deg s−1. The peak torque joint angle (i.e. the angle at which the peak torque was exerted) was recorded. The conventional Hconc:Qconc ratio and the functional Hecc:Qconc ratio were also calculated.
The peak torque joint angle increased (i.e. shifted toward shorter muscle length) in hamstrings in eccentric at 60 deg s−1 (ES = 1.35) and at 300 deg s−1 (ES = 0.71) and in concentric modality at 300 deg s−1 (ES = 0.50) but not at 60 deg s−1 (ES = 0.23). No change occurred in quadriceps at 60 deg s−1 (ES = 0.15) and 300 deg s−1 (ES = 0.20). Peak torque deteriorated in both hamstrings and quadriceps, irrespective of the testing modality (ES 0.95–1.90) Functional Hecc:Qconc ratio decreased at 60 deg s−1 (ES = 0.74) and 300 deg s−1 (ES = 0.85). No change in conventional Hconc:Qconc ratio occurred at 60 deg s−1 (ES = 0.12) and 300 deg s−1 (ES = 0.14).
The fatigue-induced changes in peak torque joint angle in hamstrings but not in quadriceps and the simultaneous decrements in the functional Hecc:Qconc ratio may point a reduced hamstrings resistive capacity, with implications for hamstrings strain injury risk.
KeywordsIsokinetic Concentric Eccentric Runners Fatigue
Compliance with ethical standards
Conflict of interest
The authors declared no conflict of interests.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
All the participants provided written consent.
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