• Journal of Korean Orthopaedic Sports Medicine
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• v.3 no.1
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• pp.31-35
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• 2004

The incidence of in-line skating injuries has increased with the rapid growth in the sport's popularity. The purpose of this article is to describing the type of the inline skating and document basic skills, protective equipment use, identify contributing or precipitating factors associated with injuries. Loss of control and inexperience were factors contributing to the injuries. Also protective equipment among skaters was underused. In conclusion, the safety education program for inline skating, optimal design and efficacy of protective equipment should identify with further study.

• Korean Journal of Computational Design and Engineering
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• v.10 no.1
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• pp.17-26
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• 2005

In-line skate generally consists of four major parts: boot, frame, bearing and wheel, and the most important part among those for necessary functionality is the frame. It is the most expensive, and it also makes a decisive role in practical race skating. The functional behavior of a frame is greatly affected by external dynamic forces as well as the static weight of a skater. We are proposing a new inline speed-skating frame design that has been improved in structural strength and weight for providing optimum speed in $20\sim40km$ marathon skating.

• Journal of Korean Orthopaedic Sports Medicine
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• v.3 no.1
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• pp.25-30
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• 2004

Objective: Recently, inline skates are populary increasing and have become major recreational activities. This study was performed to determine the effective prevention means on various extremity injury by investigating injury severity occording to acute injury and overuse injury. Results: Acute inline skating injury was experienced mostly among the age between 6$\~$14 years old children after school around nearby their home without using no appropriate safety device gear. The wrist injury was mostly happened. We think that overuse injury is related to boot itself, boot fitting and improper skating techniques. Conclusion: So afterall, appropriate safety equipment wearing in inline skating at the safe place after learning about the skating skills can reduce the acute inline skating extremity injuries. Choosing a pair of good fitting boots, performing the exact pushing techniques and take good rests in the middle of skating frequently can reduce the overuse injury.

• Korean Journal of Applied Biomechanics
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• v.18 no.4
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• pp.191-199
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• 2008

The purpose of this study was to analyze movement of inline skate players at inline roller skate T300m start so that we can find effective starting movement, and provide basic and scientific materials in improving performance of inline roller skaters for T300m inline roller skating. In doing so, five Korean national representative inline skaters who elected in 2008 Korean National Inline Roller Skating Cup were taped during the cup and analyzed through 3D viewing in terms of their starting movement Conclusions of the analysis were as follows: First, the better the record of starting phase is the shorter average of contact time on track. Second, to improve starting speed, players raised their body just like running instead of lowering them when gliding. players could shorten their strike and moved faster in order to accelerate, and it was more effective to speed up when they quickly switched from running to gliding. Third, the five country-representative players speeded up by bending their knees to a greater degree in order to improve stability. And then the most effective way was believed to minimize track connection of skating at starting in each phase.

• 프린팅코리아
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• s.12
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• pp.78-79
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• 2003

• Journal of the Korean Academy of Clinical Electrophysiology
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• v.6 no.1
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• pp.91-101
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• 2008

The purpose of this study was to investigate the effects of Inline-skating exercise on the static balance. Total 10 subjects with common were recruited from university for student in Kwangyang, and the Inline-skating exercise was conducted 3times at a week during 2 weeks. Balance test was measured by using Good Balance with overall index, NSEO(normal standing when eye open), NSEC(normal standing when eye close), OLREO(one leg right standing when eye open), OLREC(one leg right standing when eye close), OLLEO(one leg left standing when eye open), OLLEC(one leg left standing There was statistically significant difference of the balance ability of the left-right only between the before and the after exercise in the case of NSEO position. however, the statistically difference was not found in terms of the Mean X speed, Mean Y speed, Velocity moment between the before and the after exercise in the case of NSEC position. There was statistically significant difference of the balance ability of the Mean X speed, Mean Y speed between the before and the after exercise in the case of OLLEO and OLLEC position, however, the statistically difference was not found in terms of the Velocity moment between the before and the after exercise in this case. There was statistically significant difference of the balance ability of all the terms between the before and the after exercise in the case of OLREO. however, the statistically difference was not found in terms of the Mean Y speed only between the before and the after exercise in the case of OLREC. In this case, the statistically difference was found in terms of Velocity moment between the before and the after exercise. This study showed that Inline-skating exercise was effected on the improvement of the balance ability in normal peoples.

• Journal of Korean Orthopaedic Sports Medicine
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• v.3 no.1
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• pp.87-91
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• 2004

Purpose: The purpose of this study is to investigate the incidence and patterns of fractures occurred in Inline skating accident. Materials and Method: We evaluated 20 patients, 20 cases(from september 2002 to August 2003) with fractures occurred during Inline skating. The incidence, sex, age, fracture site, associated injuries, causes of Inline skating injuries were analysed. The cases were male in 18(90$\%$), and female in 2(10$\%$). The most common distribution of age was in twenties and thirties. Result: The patients(12cases 60$\%$) with upper extremity fracture were more common than patients(8cases 40$\%$) with lower extremity fracture. Patients who had fracture in ankle were 35$\%$(7cases), forearm 20$\%$(4cases), wrist 20$\%$(4cases), elbow 15$\%$(3cases), thigh 5$\%$(1cases). According to the The Lauge-Hansen classification in ankle fractures there were four patients of supination-external rotation type, two patients of supination-abduction type, and 1 patient of pronation-external rotation type. In forearm and hand fractures, there were three distal radius fractures, one radio-ulnar shaft fracture, 2 scaphoid fractures, and two meta-carpal fractures. In elbow fractures, there were two supracondyle fractures, and one lateral condyle fracture. There were three epiphyseal plate injuries (Salt-Harris type II) in children, and all of them were treated by conservative method. Six fractures were intra-articular fractures. The most common associated injury was contusion(8cases 42.1$\%$). The number of patients who only rode Inline skating less than 3months(8cases 40$\%$) was the greatest. The number of non-contact injury(14cases, 70$\%$) in Inline skating was more than contact(6cases,30$\%$) injury. 11cases(55$\%$) had operative treatment, and 9cases(45$\%$) had conservative treatment, and there was not any complication. The more detailed study is required since the materials were only limited to fracture patients, and the follow up period was short. Conclusion: The most common age for fracture in Inline skating was in twenties, and thirties, and ankle was the most common fracture site.

• Korean Journal of Applied Biomechanics
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• v.15 no.2
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• pp.11-20
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• 2005

This study has a purpose on contributing to apprehend safe and right way to stop to the inline skate beginners and to the instructors who teaches line skating on the basis for the result of the kinematical analysis on Heel brake stop movement of the inline skate, focusing on the displacement on COG, angle displacement of ankle joint, angle displacement of knee joint, angle displacement of hip joint, using a 3D image method by DLT. To achieve this goal, we analysed the kinematical factor of the 3 well-trained inline skating instructors and obtained the following results. 1. During the movement of heel-brake stop, when strong power was given to a stable and balanced stop and the lower limbs, if the physical centroid is lowered the stability increases, and if it is placed high from the base surface, as the stability decreases compared to the case of low physical centroid, we should make a stop by placing a physical centroid in the base surface and lowering the hight of physical centroid. 2. To make a stable and balanced stop and to provide a strong power to the lower limbs, it is advisable to make a stop by decreasing an angle displacement of ankle joint during a "down" movement. In case of the left ankle joint, in all events and phases the dorsiflexion angle showed a decrease. Nevertheless, in the case of the right ankle joint, the dorsiflexion angle shows an increase after a slight decrease. The dorsiflexion angle displacement of ankle joint can be diminished because of the brake pad of the rear axis frame of the right side inline skate by raising a toe, but cannot be more decreased if certain degree of an angle is made by a brake pad touching a ground surface. To provide a power to a brake pad, it is recommended to place a power by lowering a posture making the dorsiflexion angle of the left ankle joint relatively smaller than that of the right ankle. 3. To make a stable and balanced stop and to add a power to a brake pad, the power must be given to the lower limbs in lowering the hight of physical centroid. For this, it is recommended to make a down movement by decreasing the flexion angle of a knee joint and it is necessary to make a down movement by a regular decrease of the angle displacement of knee joint rather than a swift down movement in every event and phase. 4. The right angle displacement of hip joint is made by lowering vertically the hight of physical centroid as leaning slightly forward. If too narrow angle displacement of hip joint is made by leaning forward too much, the balance is lost during the stop by placing the center in front. To make a stable and balance stop and to place a strong power to the lower limbs, it is recommendable to make a narrow angle by lower the hip joint angle. However, excessive leaning of the upper body to make the angle too narrow, can cause an instable stop and loss of physical centroid. After this study, it is considered to assist the kinematical understanding during the heel brake stop movement of the inline skate, and, to present basic data in learning a method of stable and balanced stop for the inline skating beginners or for the inline skate instructors in the present situation of the complete absence of the study in inline skating.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.3 s.96
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• pp.30-37
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• 1999

This paper represents the development of the brake system for the inline skate using bellows. The inline skate that is used at present has defects due to frequent impulse, which weakens the breaking force by damaging the parts. Therefore to solve these problems a break system for the inline skates using hydraulics is suggested. To solve the oil leakage problems, bellows is used. Also to prevent the breaks from not touching the ground when skating the bellows is placed at the heel, high as possible. To obtain fast response speed, the ratio of inner diameter of the bellows is changed so that with only a small displacement from the bellows the rubber pad attached to the bellows will touch the ground fast. The performance of the break system using bellows depends on the optimal design of the bellows. Therefore the parameters that changes the form of the bellows are tested and also the interaction between the forces are investigated. The performance of new model brake system with bellows and old model system with only a rubber pad without bellows was estimated through observation of braking posture.

• Korean Journal of Applied Biomechanics
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• v.13 no.2
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• pp.123-137
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• 2003

This study is to present more effective starting skills through analysis of kinematic characteristics of starting motions in 300m Time Trials of Inline Skating. To achieve this goal, 6 athletes, 3 in the national team and 3 in business teams were chosen and their starting motions were examined with three-dimensional image analyses. The results of analyses in regard of positions and speed of the bodily center and angles, angular velocity, and linear velocity of articulations of lower limbs by sections of starting motions are as follows: In case of the central position, though it is effective to reduce the air resistance by lowering the upper part of the body maximumly, it is reasonable to accelerate by raising the upper part of the body to some degree for the running posture at the lower speed in the starting section. In the starting section, it is efficient to minimize the period of time in touching the ground. for this, it is necessary to train for taking motions without slippage while touching the ground. While 3 athletes in business teams kicked the ground as running right after the starting, the others in the national team slid on the ground. As the number of steps increased, the movable speed changed quickly. Thus the movable speed of athletes in the national team indicated big differences in two to three steps. If these factors are well supported, the push-away starting method might be better than the running starting method in terms of improvement of records.