{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T10:30:36Z","timestamp":1789468236126,"version":"build-2803163510"},"reference-count":46,"publisher":"Journal of Orthopaedic & Sports Physical Therapy (JOSPT)","issue":"10","content-domain":{"domain":["www.jospt.org"],"crossmark-restriction":true},"short-container-title":["Journal of Orthopaedic &amp; Sports Physical Therapy"],"published-print":{"date-parts":[[2018,10]]},"abstract":"<jats:sec><jats:title>Background<\/jats:title><jats:p> It has been proposed that training intensity and training volume are associated with specific running-related injuries. If such an association exists, secondary preventive measures could be initiated by clinicians, based on symptoms of a specific injury diagnosis. <\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p> To test the following hypotheses: (1) a running schedule focusing on running intensity (S-I) would increase the risk of sustaining Achilles tendinopathy, gastrocnemius injuries, and plantar fasciitis compared with hypothesized volume-related injuries; and (2) a running schedule focusing on running volume (S-V) would increase the risk of sustaining patellofemoral pain syndrome, iliotibial band syndrome, and patellar tendinopathy compared with hypothesized intensity-related injuries. <\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p> In this randomized clinical trial and etiology study, healthy recreational runners were included in a 24-week follow-up, divided into 8-week preconditioning and 16-week specific-focus training periods. Participants were randomized to 1 of 2 running schedules: S-I or S-V. The S-I group progressed the amount of high-intensity running (88% maximal oxygen consumption [VO<jats:sub>2<\/jats:sub>max] or greater) each week, and the S-V group progressed total weekly running volume. A global positioning system watch or smartphone collected data on running. Running-related injuries were diagnosed based on a clinical examination. Estimates were reported as risk difference and 95% confidence interval (CI). <\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p> Of 447 runners, a total of 80 sustained an injury (S-I, n = 36; S-V, n = 44). Risk differences (95% CIs) of intensity injuries in the S-I group were \u22120.8% (\u22125.0%, 3.4%) at 2 weeks, \u22120.8% (\u22126.7%, 5.1%) at 4 weeks, \u22122.0% (\u22129.2%, 5.2%) at 8 weeks, and \u22125.1% (\u221216.5%, 6.3%) at 16 weeks. Risk differences (95% CIs) of volume injuries in the S-V group were \u22120.9% (\u22125.0%, 3.2%) at 2 weeks, \u22122.0% (\u22127.5%, 3.5%) at 4 weeks, \u22123.2% (\u22129.1%, 2.7%) at 8 weeks, and \u22123.4% (13.2%, 6.2%) at 16 weeks. <\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p> No difference in risk of hypothesized intensity- and volume-specific running-related injuries exists between the 2 running schedules focused on progression in either running intensity or volume. <\/jats:p><\/jats:sec><jats:sec><jats:title>Level of Evidence<\/jats:title><jats:p> Etiology, level 1b. J Orthop Sports Phys Ther 2018;48(10):740\u2013748. 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