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bibliography * The PainScience Bibliography contains plain language summaries of thousands of scientific papers and others sources, like a specialized blog. This page is about a single scientific paper in the bibliography, Phan 2016.

Run like a ninja

updated
Phan X, Grisbrook TL, Wernli K, Stearne SM, Davey P, Ng L. Running quietly reduces ground reaction force and vertical loading rate and alters foot strike technique. J Sports Sci. 2016 Sep:1–7. PubMed #27594087.
Tags: etiology, odd, shin pain, counter-intuitive, running, pro, leg, limbs, pain problems, overuse injury, injury, exercise, self-treatment, treatment

PainSci summary of Phan 2016?This page is one of thousands in the PainScience.com bibliography. It is not a general article: it is focused on a single scientific paper, and it may provide only just enough context for the summary to make sense. Links to other papers and more general information are provided at the bottom of the page, as often as possible. ★★★☆☆?3-star ratings are for typical studies with no more (or less) than the usual common problems. Ratings are a highly subjective opinion, and subject to revision at any time. If you think this paper has been incorrectly rated, please let me know.

This was a study of the relationship between the loudness of foot strikes in running and several technical measures of forces on the lower limb. Twenty-six runners were tested when instructed to run quietly versus normally. Most runners (77%) switched to a forefoot running style. The surprise finding is that natural variation in footstrike volume has no direct relationship with smaller, slower impact forces when running normally. In other words, there are some quiet runners with a jarring gait, and some surprisingly silent runners who are really pounding the ground. Odd.

Not so surprisingly, actually trying to run quietly does soften footstrike.

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original abstractAbstracts here may not perfectly match originals, for a variety of technical and practical reasons. Some abstacts are truncated for my purposes here, if they are particularly long-winded and unhelpful. I occasionally add clarifying notes. And I make some minor corrections.

This study aimed to determine if a quantifiable relationship exists between the peak sound amplitude and peak vertical ground reaction force (vGRF) and vertical loading rate during running. It also investigated whether differences in peak sound amplitude, contact time, lower limb kinematics, kinetics and foot strike technique existed when participants were verbally instructed to run quietly compared to their normal running. A total of 26 males completed running trials for two sound conditions: normal running and quiet running. Simple linear regressions revealed no significant relationships between impact sound and peak vGRF in the normal and quiet conditions and vertical loading rate in the normal condition. t-Tests revealed significant within-subject decreases in peak sound, peak vGRF and vertical loading rate during the quiet compared to the normal running condition. During the normal running condition, 15.4% of participants utilised a non-rearfoot strike technique compared to 76.9% in the quiet condition, which was corroborated by an increased ankle plantarflexion angle at initial contact. This study demonstrated that quieter impact sound is not directly associated with a lower peak vGRF or vertical loading rate. However, given the instructions to run quietly, participants effectively reduced peak impact sound, peak vGRF and vertical loading rate.

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This page is part of the PainScience BIBLIOGRAPHY, which contains plain language summaries of thousands of scientific papers & others sources. It’s like a highly specialized blog. A few highlights: