Influence of Placement on the Validity of RunScribe™
Abstract
Due to the high incidence of running-related injury, biomechanical flaws of the running stride must be investigated. RunScribe™ footpods are light-weight devices that clip onto the shoe and record kinematic variables with each step. PURPOSE: This study will investigate the influence of footpod placement on the validity of RunScribe™ output compared to hi-speed video analysis. METHOD: Five collegiate distance runners (21.0 ± 0.7yo; 168.15cm ± 4.5cm; 62.5 ± 5.0 kg) volunteered to participate and granted informed consent. Participants were fit with left-sided body-markers along the line of the achilles tendon and superior-inferior axis of the shoe’s heel-counter, a RunScribe™ on both the left laces and heel, and ran for two, 5-min sessions on a treadmill. High-speed cameras recorded in the sagittal and frontal planes. The last 21 strides were analyzed using Kinovea computer software and compared to data downloaded from RunScribe™ for stride-length, stride-rate, ground-contact-time, pronation-excursion, and max pronation-velocity. Validity and reliability of measurements between RunScribe™ and video were assessed with SPSS and intraclass correlation coefficients, respectively. RESULTS: There was a strong correlation between data from both footpod locations and Kinovea for ground-contact-time and stride-rate (r=0.985 ± 0.001; r=0.997 ± 0.000), and between heels and laces for each of the variables (r=0.959 ± 0.393). There is a stronger correlation between the heel and Kinovea (r=0.868) than the laces and Kinovea (r=0.635) for max pronation-velocity. CONCLUSION: RunScribe™ is an accurate tool in assessing GCT and stride-rate. Heel-placement will likely output more accurate data for max pronation-velocity compared to the laces.
Influence of Placement on the Validity of RunScribe™
University Commons
Due to the high incidence of running-related injury, biomechanical flaws of the running stride must be investigated. RunScribe™ footpods are light-weight devices that clip onto the shoe and record kinematic variables with each step. PURPOSE: This study will investigate the influence of footpod placement on the validity of RunScribe™ output compared to hi-speed video analysis. METHOD: Five collegiate distance runners (21.0 ± 0.7yo; 168.15cm ± 4.5cm; 62.5 ± 5.0 kg) volunteered to participate and granted informed consent. Participants were fit with left-sided body-markers along the line of the achilles tendon and superior-inferior axis of the shoe’s heel-counter, a RunScribe™ on both the left laces and heel, and ran for two, 5-min sessions on a treadmill. High-speed cameras recorded in the sagittal and frontal planes. The last 21 strides were analyzed using Kinovea computer software and compared to data downloaded from RunScribe™ for stride-length, stride-rate, ground-contact-time, pronation-excursion, and max pronation-velocity. Validity and reliability of measurements between RunScribe™ and video were assessed with SPSS and intraclass correlation coefficients, respectively. RESULTS: There was a strong correlation between data from both footpod locations and Kinovea for ground-contact-time and stride-rate (r=0.985 ± 0.001; r=0.997 ± 0.000), and between heels and laces for each of the variables (r=0.959 ± 0.393). There is a stronger correlation between the heel and Kinovea (r=0.868) than the laces and Kinovea (r=0.635) for max pronation-velocity. CONCLUSION: RunScribe™ is an accurate tool in assessing GCT and stride-rate. Heel-placement will likely output more accurate data for max pronation-velocity compared to the laces.
