The Association Between Changes in Speed Skating Technique and Changes in Skating Velocity

2014 ◽  
Vol 9 (1) ◽  
pp. 68-76 ◽  
Author(s):  
Dionne A. Noordhof ◽  
Carl Foster ◽  
Marco J.M. Hoozemans ◽  
Jos J. de Koning
Keyword(s):  
Confidence Interval ◽  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Performance Level ◽  
World Cup ◽  
Video Recordings ◽  
Speed Skating ◽  
Frequency Identification ◽  
Identification Tags ◽  
And Performance

A meaningful association between changes (Δ) in push-off angle or effectiveness (e) and changes in skating velocity (v) has been found during 5000-m races, although no significant association was found between changes in knee (θ0) and trunk angle (θ1) and Δv. It might be that speed skating event, sex, and performance level influence these associations.Purpose:To study the effect of skating event, sex, and performance level on the association between Δe and Δv and between Δθ0 and Δθ1 and Δv.Methods:Video recordings were made from frontal (e) and sagittal views (θ0 and θ1) during 1500- and 5000-m men’s and women’s World Cup races. Radio-frequency identification tags provided data of v.Results:Skating event influenced the association between Δe and Δv, which resulted in a significant association between Δe and Δv for the 5000-m (β = –0.069, 95% confidence interval [–0.11, –0.030]) but not for the 1500-m (β = –0.011 [–0.032, 0.010]). The association between Δθ0 and Δθ1 and Δv was not significantly influenced by skating event. Sex and performance level did not substantially affect the association between Δe and Δv and between Δθ0 and Δθ1 and Δv.Conclusions:Skating event significantly influenced the association between Δe and Δv; a 1° change in e results in a 0.011-m/s decrease in v during the 1500-m and a 0.069-m/s decrease in v during the 5000-m. Thus, it seems especially important to maintain a small e during the 5000-m.

Changes in Speed Skating Velocity in Relation to Push-Off Effectiveness

2013 ◽  
Vol 8 (2) ◽  
pp. 188-194 ◽  
Author(s):  
Dionne A. Noordhof ◽  
Carl Foster ◽  
Marco J.M. Hoozemans ◽  
Jos J. de Koning
Keyword(s):  
Radio Frequency Identification ◽  
Muscle Power ◽  
Frontal View ◽  
Power Losses ◽  
Knee Angle ◽  
World Cup ◽  
Speed Skating ◽  
Frequency Identification ◽  
Identification Tags ◽  
Insight Into

Speed skating posture, or technique, is characterized by the push-off angle or effectiveness (e), determined as the angle between the push-off leg and the ice; the preextension knee angle (θ0); and the trunk angle (θ1). Together with muscle-power output and environmental conditions, skating posture, or technique, determines velocity (v).Purpose:To gain insight into technical variables that are important to skate efficiently and perform well, e, θ0, θ1, and skating v were determined every lap during a 5000-m World Cup. Second, the authors evaluated if changes (Δ) in e, θ0, and θ1 are associated with Δv.Methods:One camera filmed the skaters from a frontal view, from which e was determined. Another camera filmed the skaters from a sagittal view, from which θ0 and θ1 were determined. Radio-frequency identification tags around the ankles of the skaters measured v.Results:During the race, e progressively increased and v progressively decreased, while θ0 and θ1 showed a less consistent pattern of change. Generalized estimating equations showed that Δe is significantly associated with Δv over the midsection of the race (β = −0.10, P < .001) and that Δθ0 and Δθ1 are not significantly associated with Δv.Conclusions:The decrease in skating v over the race is not due to increases in power losses to air friction, as knee and trunk angle were not significantly associated with changes in velocity. The decrease in velocity can be partly ascribed to the decrease in effectiveness, which reflects a decrease in power production associated with fatigue.

Reliability evaluation of wearable radio frequency identification tags: Design and fabrication of a two-part textile antenna

2018 ◽  
Vol 89 (4) ◽  
pp. 560-571 ◽  
Author(s):  
Xiaochen Chen ◽  
Leena Ukkonen ◽  
Johanna Virkki
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Integrated Circuit ◽  
High Performance ◽  
Cyclic Strain ◽  
Moist Environment ◽  
Frequency Identification ◽  
Identification Tags ◽  
Cost Efficient ◽  
The One

Passive radio frequency identification-based technology is a convincing approach to the achievement of versatile energy- and cost-efficient wireless platforms for future wearable applications. By using two-part antenna structures, the antenna-electronics interconnections can remain non-stressed, which can significantly improve the reliability of the textile-embedded wireless components. In this article, we describe fabrication of two-part stretchable and non-stretchable passive ultra-high frequency radio frequency identification textile tags using electro-textile and embroidered antennas, and test their reliability when immersed as well as under cyclic strain. The results are compared to tags with traditional one-part dipole antennas fabricated from electro-textiles and by embroidery. Based on the results achieved, the initial read ranges of the two-part antenna tags, around 5 m, were only slightly shorter than those of the one-part antenna tags. In addition, the tag with two-part antennas can maintain high performance in a moist environment and during continuous stretching, unlike the one-part antenna tag where the antenna-integrated circuit attachment is under stress.

scholarly journals Wireless Breast Localization Using Radio-frequency Identification Tags: The First Reported European Experience in Breast Cancer

In Vivo ◽  
2019 ◽  
Vol 34 (1) ◽  
pp. 233-238 ◽  
Author(s):  
UMAR WAZIR ◽  
SALIM TAYEH ◽  
NICHOLAS PERRY ◽  
MICHAEL MICHELL ◽  
ANMOL MALHOTRA ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Radio Frequency ◽  
Radio Frequency Identification ◽  
European Experience ◽  
Frequency Identification ◽  
Identification Tags

Design and Evaluation of Planar Bifilar Helical Antennas for Radio Frequency Identification Tags

2019 ◽  
Vol 18 (12) ◽  
pp. 2642-2646
Author(s):  
Weikang Chen ◽  
Zhenyi Niu ◽  
Mengyuan Li ◽  
Zhuo Li ◽  
Qian Xu ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Frequency Identification ◽  
Identification Tags ◽  
Helical Antennas

Passive active radio frequency identification tags

2006 ◽  
Vol 1 (1) ◽  
pp. 52 ◽  
Author(s):  
Alex K. Jones ◽  
Swapna Dontharaju ◽  
Shenchih Tung ◽  
Peter J. Hawrylak ◽  
Leonid Mats ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Frequency Identification ◽  
Identification Tags

Management of surgical instruments with radio frequency identification tags

2016 ◽  
Vol 29 (2) ◽  
pp. 236-247 ◽  
Author(s):  
Kaori Kusuda ◽  
Kazuhiko Yamashita ◽  
Akiko Ohnishi ◽  
Kiyohito Tanaka ◽  
Masaru Komino ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Management System ◽  
Surgical Instruments ◽  
Rfid Tags ◽  
Surgical Instrument ◽  
Content Type ◽  
History Of ◽  
Frequency Identification ◽  
Identification Tags

Purpose – To prevent malpractices, medical staff has adopted inventory time-outs and/or checklists. Accurate inventory and maintenance of surgical instruments decreases the risk of operating room miscounting and malfunction. In our previous study, an individual management of surgical instruments was accomplished using Radio Frequency Identification (RFID) tags. The purpose of this paper is to evaluate a new management method of RFID-tagged instruments. Design/methodology/approach – The management system of RFID-tagged surgical instruments was used for 27 months in clinical areas. In total, 13 study participants assembled surgical trays in the central sterile supply department. Findings – While using the management system, trays were assembled 94 times. During this period, no assembly errors occurred. An instrument malfunction had occurred after the 19th, 56th, and 73th uses, no malfunction caused by the RFID tags, and usage history had been recorded. Additionally, the time it took to assemble surgical trays was recorded, and the long-term usability of the management system was evaluated. Originality/value – The system could record the number of uses and the defective history of each surgical instrument. In addition, the history of the frequency of instruments being transferred from one tray to another was recorded. The results suggest that our system can be used to manage instruments safely. Additionally, the management system was acquired of the learning effect and the usability on daily maintenance. This finding suggests that the management system examined here ensures surgical instrument and tray assembly quality.

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