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Barry R. Greene, Timothy G. Foran, Denise McGrath, Emer P. Doheny, Adrian Burns and Brian Caulfield

This study compares the performance of algorithms for body-worn sensors used with a spatiotemporal gait analysis platform to the GAITRite electronic walkway. The mean error in detection time (true error) for heel strike and toe-off was 33.9 ± 10.4 ms and 3.8 ± 28.7 ms, respectively. The ICC for temporal parameters step, stride, swing and stance time was found to be greater than 0.84, indicating good agreement. Similarly, for spatial gait parameters—stride length and velocity—the ICC was found to be greater than 0.88. Results show good to excellent concurrent validity in spatiotemporal gait parameters, at three different walking speeds (best agreement observed at normal walking speed). The reported algorithms for body-worn sensors are comparable to the GAITRite electronic walkway for measurement of spatiotemporal gait parameters in healthy subjects.

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Rahel Gilgen-Ammann, Thomas Wyss, Severin Troesch, Louis Heyer and Wolfgang Taube

Context: Successful elite sprint to long-distance runners are known to have shorter ground-contact time (GCT) than their less successful counterparts. Purpose: To investigate whether augmented feedback (aF) about GCT can reduce the time on ground (TOG) per minute in long-distance runners and, if so, whether this reduction improves running performance. Methods: Thirty well-trained runners were allocated to 3 groups. The intervention group (IG) received visual aF about their GCT during 8 high-intensity interval sessions in the 4-wk training period and were instructed to minimize GCT. The 1st control group (CG1) trained with the IG but was not given any feedback. The 2nd control group (CG2) followed their own training routine. Data were obtained pre- and postintervention for all 3 groups. The dependent variable was TOG per minute, computed from step frequency and GCT. Results: The IG significantly reduced TOG (P = .043, −1.7%, 90%CL −3.1;−0.3) and improved their mean 10 × 400-m performance time (P < .001, −1.5%, 90%CL −1.9;−1.1). In contrast, the 2 control groups revealed unchanged values, indicating that normal high-intensity training and an individualized routine without aF were not able to reduce TOG. The fact that CG1 received the same instructions and participated in the same training sessions as the IG underlined that aF was crucial to reduce TOG. Conclusions: The provision of aF about GCT seems to be a promising approach that should be considered during training practice of well-trained runners.

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Roel De Ridder, Julien Lebleu, Tine Willems, Cedric De Blaiser, Christine Detrembleur and Philip Roosen

IMU to a golden standard, such as the GAITRite ® system with proven reliability and validity of spatiotemporal gait parameters. 8 The purpose of this study was to confirm the test–retest reliability and concurrent validity of a commercially available body-worn sensor—BTS G-WALK ® sensor system

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Gurtej S. Grewal, Rachel Baisch, Jacqueline Lee-Eng, Stephaine Wu, Beth Jarrett, Neil Humble and Bijan Najafi


Improvements in postural stability in figure skaters can play a significant role in performance, as well as reducing fall risk.


To explore the effect of custom foot insoles on postural stability in advanced figure skaters.


Exploratory study.


Out of laboratory.


Nine advanced figure skaters were recruited and 7 completed the study (age 38 ± 18.5 y, body-mass index 25 ± 3.6 kg/m2).


Custom foot insoles.

Main Outcome Measures:

Primary outcome of changes in postural stability (PS) quantified by center-of-mass sway with secondary outcomes of ankleand hip-joint sway and joint range of motion. Sway measurements were assessed using body-worn sensors while participants wore skates on ice. PS was assessed in single-leg stance, as well as during gliding on the dominant foot.


A significant improvement in static PS was observed after 6-wk use of custom insoles. Center-of-mass sway reduced significantly on average by 48.44% (P = .023), and ankle-joint sway reduced by 45.7% (P = .05) during single-leg-stance balance measurements. During the gliding maneuver nonsignificant changes were observed for both ankle- and knee-joint range of motion.


The results of this study suggest proof of concept toward benefits of custom insoles in improving postural stability in advanced figure skaters. To generalize the findings, randomized controlled trials with larger sample sizes are warranted.

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Philippa M. Dall, Dawn A. Skelton, Manon L. Dontje, Elaine H. Coulter, Sally Stewart, Simon R. Cox, Richard J. Shaw, Iva Čukić, Claire F. Fitzsimons, Carolyn A. Greig, Malcolm H. Granat, Geoff Der, Ian J. Deary, Sebastien F.M. Chastin and On behalf of the Seniors USP Team

Physical activity (PA) and sedentary behavior (SB) are important modifiable risk factors related to a range of health conditions, including mortality, cardiovascular and metabolic disease, and cancer ( Biswas et al., 2015 ; Ekelund et al., 2016 ). Objective measures, using body-worn sensors

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Pamela K. Samra, Amanda L. Rebar, Lynne Parkinson, Jannique G.Z. van Uffelen, Stephanie Schoeppe, Deborah Power, Anthony Schneiders, Corneel Vandelanotte and Stephanie Alley

-016-0375-9 Taraldsen , K. , Chastin , S.F. , Riphagen , II , Vereijken , B. , & Helbostad , J.L. ( 2012 ). Physical activity monitoring by use of accelerometer-based body-worn sensors in older adults: A systematic literature review of current knowledge and applications . Maturitas, 71 , 13 – 19 . PubMed

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Florian Herbolsheimer, Stephanie Mosler, Richard Peter and the ActiFE Ulm Study Group

. , & Helbostad , J.L. ( 2011 ). Evaluation of a body-worn sensor system to measure physical activity in older people with impaired function . Physical Therapy, 91 ( 2 ), 277 – 285 . PubMed doi: 10.2522/ptj.20100159 Thompson Coon , J. , Boddy , K. , Stein , K. , Whear , R. , Barton , J

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A. Stefanie Mikolaizak, Jochen Klenk, Dietrich Rothenbacher, Michael D. Denkinger, Kilian Rapp and for the ActiFE Study Group

-based body-worn sensors in older adults: A systematic literature review of current knowledge and applications . Maturitas, 71 ( 1 ), 13 – 19 . PubMed ID: 22134002 doi:10.1016/j.maturitas.2011.11.003 10.1016/j.maturitas.2011.11.003 Thompson , C. , Boddy , K. , Stein , K. , Whear , R. , Barton , J

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Christian A. Clermont, Andrew J. Pohl and Reed Ferber

.10.021 29080511 16. Strohrmann C , Harms H , Kappeler-Setz C , Tröster G . Monitoring kinematic changes with fatigue in running using body-worn sensors . IEEE Trans Inf Technol Biomed . 2012 ; 16 ( 5 ): 983 – 990 . PubMed ID: 22677321 doi: 10.1109/TITB.2012.2201950 22677321 17. Meeusen R

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Miguel Ángel de la Cámara, Sara Higueras-Fresnillo, David Martinez-Gomez and Óscar L. Veiga

. PubMed ID: 12782543 doi:10.1136/bjsm.37.3.197 10.1136/bjsm.37.3.197 Taraldsen , K. , Chastin , S.F.M. , Riphagen , I.I. , Vereijken , B. , & Helbostad , J.L. ( 2012 ). Physical activity monitoring by use of accelerometer-based body-worn sensors in older adults: A systematic literature review