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Olivier Girard, Franck Brocherie, Jean-Benoit Morin, Francis Degache and Grégoire P. Millet

We compared different approaches to analyze running mechanics alterations during repeated treadmill sprints. Thirteen active male athletes performed five 5-second sprints with 25 seconds of recovery on an instrumented treadmill. This approach allowed continuous measurement of running kinetics/kinematics and calculation of vertical and leg stiffness variables that were subsequently averaged over 3 distinct sections of the 5-second sprint (steps 2–5, 7–10, and 12–15) and for all steps (steps 2–15). Independently from the analyzed section, propulsive power and step frequency decreased with fatigue, while contact time and step length increased (P < .05). Except for step frequency, all mechanical variables varied (P < .05) across sprint sections. The only parameters that highly depend on running velocity (propulsive power and vertical stiffness) showed a significant interaction (P < .05) between the analyzed sections, with smaller magnitude of fatigue-induced change observed for steps 2–5. Considering all steps or only a few steps during early, middle, or late phases of 5-second sprints provides similar mechanical outcomes during repeated treadmill sprinting, although acceleration induces noticeable differences between the sections studied. Furthermore, quantifying mechanical alterations from the early acceleration phase may not be readily detectable, and is not recommended.

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Simone Ciacci, Rocco Di Michele, Silvia Fantozzi and Franco Merni

Context:

Kinematic asymmetry is believed to be associated with elevated risk for muscle injury, but little is known about the links between hamstring injuries and asymmetry of sprinting mechanics.

Objective:

To evaluate the value of kinematic analysis of sprinting for the detection of injury-related asymmetry in athletes with a history of hamstring strain.

Participants:

Six sub-elite male sprinters, including two who sustained a hamstring strain injury.

Outcome Measures:

Absolute differences between left and right symmetry indices and symmetry angles were both calculated for ground contact time and selected angular displacements. Measurements were acquired at foot strike, during the stance phase, and at toe-off.

Results:

At toe-off, injured athletes exhibited greater knee flexion and less hip extension for the injured extremity compared to the uninjured extremity. Symmetry indices for these variables markedly exceeded an established 15% threshold for clinically relevant asymmetry. Each of the uninjured athletes exhibited a high degree of symmetry for all parameters, with mean values for symmetry indices significantly lower than the 15% threshold (P < 0.05).

Conclusions:

Kinematic analysis of sprinting asymmetry appears to be valuable for identification of elevated risk for hamstring injury.

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Reed D. Gurchiek, Hasthika S. Rupasinghe Arachchige Don, Lasanthi C. R. Pelawa Watagoda, Ryan S. McGinnis, Herman van Werkhoven, Alan R. Needle, Jeffrey M. McBride and Alan T. Arnholt

.1111/sms.12490 25996964 2. Setuain I , Lecumberri P , Ahtiainen JP , Mero AA , Häkkinen K , Izquierdo M . Sprint mechanics evaluation using inertial sensor-based technology: a laboratory validation study . Scand J Med Sci Sports . 2018 ; 28 ( 2 ): 463 – 472 . PubMed ID: 28685862 doi

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Ryu Nagahara, Mirai Mizutani, Akifumi Matsuo, Hiroaki Kanehisa and Tetsuo Fukunaga

acceleration . Can J Appl Sport Sci . 1984 ; 9 : 42 – 52 . PubMed 6705128 8. Rabita G , Dorel S , Slawinski J , et al . Sprint mechanics in world-class athletes: a new insight into the limits of human locomotion . Scand J Med Sci Sports . 2015 ; 25 : 583 – 594 . PubMed doi:10.1111/sms.12389 10

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Sergio Jiménez-Rubio, Archit Navandar, Jesús Rivilla-García, Víctor Paredes-Hernández and Miguel-Ángel Gómez-Ruano

, Morin JB , et al . Effects of hamstring-emphasized neuromuscular training on strength and sprinting mechanics in football players . Scand J Med Sci Sports . 2015 ; 25 ( 6 ): e621 – e629 . doi: 10.1111/sms.12388 25556888 40. Reid LC , Cowman JR , Green BS , Coughlan GF . Return to play