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Production of adjustable in-line skates
Sulovský, Marek ; Kandus, Bohumil (referee) ; Žák, Ladislav (advisor)
The thesis is focused on design of adjustable in-line skates. Using this design, users can set its length to their shoes. Adjustable length can cover up to three shoe length sizes. Traditional wood and steel designs are now almost fully replaced by plastic. Plastics are modern materials that have a lot of useful features. They have lower density than steel, while maintaining acceptable stiffness. Major part of the design can be manufactured using plastic injection molding and wheels are made by casting technology. Remaining parts include standardized stainless steel bolts with threaded inserts and aluminum rivets. Major features, setting this design apart include stable 3-wheel platform, fast Velcro fixing and built-in hex driver.
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Effect fo different sizes of wheels of in-line skates on energy expenditure
Sukovič, Richard ; Jindra, Matouš (advisor) ; Brtník, Tomáš (referee)
EFFECT OF DIFFERENT SIZES OF WHEELS OF IN-LINE SKATES ON ENERGY EXPENDITURE Objectives: The aim of this bachelor thesis is to determine the difference in energy expenditure when using different sizes of wheels of in-line skates. Methods: The research group consisted of 5 people in age 26,4 ± 2,2 years. This was an experiment. The calculation of energy expediture was based on the amount of oxygen consumption (VO2) and exhaled carbon dioxide (VCO2), i.e. indirect calorimetry. For the analysis of respiratory gases MetaMax 3B measuring device was used. Three sizes of wheels of the same hardness were tested. The rides were carried out on a 1,5 km section of a cycle path with the effect of the height difference of 2 mm/m. Probands completed one test ride (with a cadence of 70 rpm) on each size set of wheels. Test ride lasted for 5 minutes. For results were processed values of 3 minutes steady state VO2. Results: We found out a noticeable difference in energy output between 72 mm and 90 mm large wheels. The difference between driving on 72 mm and 80 mm large wheels and driving on 80 mm and 90 mm large wheels was, due to the standard error of measurement, insignificatnt. Conclusion: The energy expenditure reached a noticeable increase in driving with a larger diameter of wheels compared to driving on...
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Effect fo different sizes of wheels of in-line skates on energy expenditure
Sukovič, Richard ; Jindra, Matouš (advisor) ; Brtník, Tomáš (referee)
EFFECT OF DIFFERENT SIZES OF WHEELS OF IN-LINE SKATES ON ENERGY EXPENDITURE Objectives: The aim of this bachelor thesis is to determine the difference in energy expenditure when using different sizes of wheels of in-line skates. Methods: The research group consisted of 5 people in age 26,4 ± 2,2 years. This was an experiment. The calculation of energy expediture was based on the amount of oxygen consumption (VO2) and exhaled carbon dioxide (VCO2), i.e. indirect calorimetry. For the analysis of respiratory gases MetaMax 3B measuring device was used. Three sizes of wheels of the same hardness were tested. The rides were carried out on a 1,5 km section of a cycle path with the effect of the height difference of 2 mm/m. Probands completed one test ride (with a cadence of 70 rpm) on each size set of wheels. Test ride lasted for 5 minutes. For results were processed values of 3 minutes steady state VO2. Results: We found out a noticeable difference in energy output between 72 mm and 90 mm large wheels. The difference between driving on 72 mm and 80 mm large wheels and driving on 80 mm and 90 mm large wheels was, due to the standard error of measurement, insignificatnt. Conclusion: The energy expenditure reached a noticeable increase in driving with a larger diameter of wheels compared to driving on...
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Production of adjustable in-line skates
Sulovský, Marek ; Kandus, Bohumil (referee) ; Žák, Ladislav (advisor)
The thesis is focused on design of adjustable in-line skates. Using this design, users can set its length to their shoes. Adjustable length can cover up to three shoe length sizes. Traditional wood and steel designs are now almost fully replaced by plastic. Plastics are modern materials that have a lot of useful features. They have lower density than steel, while maintaining acceptable stiffness. Major part of the design can be manufactured using plastic injection molding and wheels are made by casting technology. Remaining parts include standardized stainless steel bolts with threaded inserts and aluminum rivets. Major features, setting this design apart include stable 3-wheel platform, fast Velcro fixing and built-in hex driver.
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