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Scand J Med Sci Sports. 2015 Dec;25(6):e638-45. doi: 10.1111/sms.12397. Epub 2014 Dec 30.

Association of previous injury and speed with running style and stride-to-stride fluctuations.

Author information

1
Sports Medicine Research Laboratory, Public Research Centre for Health, Luxembourg, Luxembourg.
2
NUTRIM School for Nutrition, Toxicology and Metabolism, Maastricht University, Maastricht, The Netherlands.
3
Sports Clinic, Centre Hospitalier de Luxembourg, Luxembourg, Luxembourg.

Abstract

Running-related injuries remain problematic among recreational runners. We evaluated the association between having sustained a recent running-related injury and speed, and the strike index (a measure of footstrike pattern, SI) and spatiotemporal parameters of running. Forty-four previously injured and 46 previously uninjured runners underwent treadmill running at 80%, 90%, 100%, 110%, and 120% of their preferred running speed. Participants wore a pressure insole device to measure SI, temporal parameters, and stride length (S(length)) and stride frequency (S(frequency)) over 2-min intervals. Coefficient of variation and detrended fluctuation analysis provided information on stride-to-stride variability and correlative patterns. Linear mixed models were used to compare differences between groups and changes with speed. Previously injured runners displayed significantly higher stride-to-stride correlations of SI than controls (P = 0.046). As speed increased, SI, contact time (T(contact)), stride time (T(stride)), and duty factor (DF) decreased (P < 0.001), whereas flight time (T(flight)), S(length), and S(frequency) increased (P < 0.001). Stride-to-stride variability decreased significantly for SI, T(contact), T(flight), and DF (P ≤ 0.005), as did correlative patterns for T(contact), T(stride), DF, S(length), and S(frequency) (P ≤ 0.044). Previous running-related injury was associated with less stride-to-stride randomness of footstrike pattern. Overall, runners became more pronounced rearfoot strikers as running speed increased.

KEYWORDS:

Strike index; detrended fluctuation analysis; running biomechanics; running-related injury

PMID:
25557130
DOI:
10.1111/sms.12397
[Indexed for MEDLINE]

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