Influence of Track Interval Times on the Total Run Time in Skeleton and The
Total Page:16
File Type:pdf, Size:1020Kb
2010 Nr. 3(61) 47 different under three different conditions: carrying differences (p > 0.05) under three different conditions: bag – 1.95 ± 0.15 m.s–1 (p < 0.05 comparison with carrying bag – 135,5 ± 17,06 shots; pulling bag – 136 ± pulling bag and using power cart); pulling bag – 2.13 ± 22,41 shots; using power cart – 134,17 ± 23,78 shots. 0.05 m.s–1 (p < 0.05 comparison with using power Despite non changing of golf shots under three cart); using power cart – 2.97 ± 0.36 m.s–1. Energy different conditions (p > 0.05), walking speed decreased consumption (kcal, kcal.kg–1, kcal.min–1) values were (p < 0.05), and energy consumption increased (p < 0.05) different as well: carrying bag – 1647.83 ± 359.61 kcal, corresponding to strenuous conditions. Probably to 27.58 ± 3.33 kcal.kg–1, 5.52 ± 1.09 kcal.min–1 (p < 0.05 these may have fatigue of golfers in more strenuous comparison with pulling bag and using power cart); conditions. Therefore it is recommended to golfers pulling bag – 1352.67 ± 302.62 kcal, 22.51 ± 1.41 kcal. to carry golf bag when practising or playing. Young kg–1, 4.98 ± 0.98 kcal.min–1 (p < 0.05 comparison golfers might be advised to include additional aerobic with using power cart); using power cart – 857.83 ± training into their training week programme. 288.9 kcal, 14.16 ± 2.87 kcal.kg–1, 3.48 ± 0.69 kcal.min–1. Keywords: golf, locomotion profile, energy Between playing results (score) were not significant demands, playing conditions. Marius Zienius Lietuvos kūno kultūros akademijos Sporto edikologijos fakulteto Sportinių žaidimų katedra Sporto g. 6, LT-44221 Kaunas Mob. +370 613 46 179 Gauta 2009 11 19 El. paštas: [email protected] Patvirtinta 2010 09 06 Influence of track interval times on the total run time in skeleton and the sport of luge Veronika Fedotova Riga Technical University, Institute of Biomaterials and Biomechanics Summary Performance of athletes in sliding sports is track-specific and influenced by various factors, including environmental conditions and choice of equipment. During this study track-specific influence of interval times on the outcome of the run was examined for men single events in luge and skeleton. Lake Placid sliding track is thoroughly familiar to elite athletes due to its long traditions in hosting international competitive events, and therefore it was chosen for the study. Correlation analysis was performed in order to determine which intervals of the track have a strong influence on the run time over the whole distance. Ratio of the interval times to the total run time was determined. Correlation was computed between interval times and remaining run times, in order to obtain independent variables for analysis. Results of the correlation analysis from Lake Placid track were compared to results obtained from competitions at Whistler track. This track, in contrary to Lake Placid track, has been opened recently and hosted just a few competitive events, therefore being new to athletes. Results of the study had shown that starting interval at Lake Placid track influences the outcome of the run in luge more than in skeleton. Overall interval time influence at Lake Placid track is weaker for luge athletes than for athletes of skeleton. At Whistler track, however, correlation coefficients between interval times and remaining run times were at the same level both for skeleton and luge athletes. It was found that intervals crossed by athletes at shorter times influence the result as much and even stronger than intervals that take longer time to pass. Interval times demonstrated stronger correlation with the remaining times for top-10 results in luge than for results from 11th to 25th place. A similar tendency was found for the sport of skeleton: correlation coefficients for top-10 athlete’s group were slightly higher than for athletes at ranked from 11th to 20th place. It was concluded that results of competitive runs at Lake Placid track for luge athletes are influenced by starting interval and the 3rd interval time stronger than by other intervals. For skeleton athletes interval between curves 12 and 15 have a major importance. Since just two luge and one skeleton competition took place at Whistler track, only preliminary conclusions can be done for this track. During skeleton competition athletes were mostly influenced by the part of the track including curves 9 and 10, but no conclusions can be drawn about correlation between starting interval and remaining rune time. Correlation coefficient of 0.46 was found between starting time and remaining run time for lugers at Whistler track. Keywords: the sport of skeleton, luge, interval times, correlation coefficient. 48 SPORTO MOKSLAS Introduction the result of the competition (Brüggemann et al., Three winter sports known as “sliding sports” make 1997). This study, however, was limited to one part of Winter Olympic Games program – bobsleigh, specific race at Lillehammer track. skeleton and the sport of luge. There are 19 sliding The aim of this study is to analyse impact of tracks in the world approved by International Luge time spent on different intervals of the track on Federation (FIL) for international competitions the total run time in order to determine whereas on artificial tracks; 15 tracks are approved by performance at any part of the track has a major International Bobsleigh and Skeleton Federation influence on the overall performance despite varying (FIBT), including recently opened (opening year environmental conditions. The study would also 2008) Whistler track in Canada that hosted 2010 provide more detailed information on peculiarities Winter Olympic Games. 14 out of 15 tracks certified of performance in sliding sports at given tracks. by FIBT are FIL-approved, however not all of them Two tracks in Lake Placid and Whistler have been are actively used for international events. chosen for this research. FIBT requires measurement of five interval times Methods along the track; the first interval time known as “start time” is measured 50 m after crossing the first pair of Lake Placid combined bobsleigh-skeleton-luge photo-electric cells (the first pair of the photocells is track, rebuilt in 2000 was chosen for this study due to located at the end of the 15 m long push-off stretch). its long traditions in hosting competitive events and The next four interval time measurements are done its high level of difficulty. According to New York evenly along the track, an additional measurement State Olympic Regional Development Authority is for the final time; all interval times and final (ORDA) information, Lake Placid skeleton track is time measured up to one hundredth of a second are 1370 m long with 20 curves. In 2007 a new start included into the official race protocol. ramp was built for men’s luge events, thus making FIL rules require measurement of start time and the length of the luge track 1356 m. at least three intermediate times; together with the Competition results at Lake Placid track were final time it gives five time measurements in a race compared to the results at the newest track built report done as exact as to 1000th of a second. Time in Canada, Whistler. This track has 16 curves; it is measurement initiates at 5 – 10 m distance from the 1450 m long for skeleton events and 1374 m long for start handles. men’s luge singles events (official data of Whistler The whole run in sliding sports takes around one Sliding Centre). minute depending on the track; hundredths or even Data for analysis was collected from results thousandths of a second often determine a winner, databases available on official FIBT and FIL whilst difference between the first and the last websites. The study is limited to skeleton and luge place makes seconds. At given conditions success male single disciplines; junior competitions were of an athlete depends on multiple factors, including not considered in this study. Analysis was performed not only appropriate technique, but also quality of for the following competition types: World equipment, ice surface, temperature, etc. Championships, World Cups, Intercontinental Cups, There is a common belief that a good start America’s Cups, Nations Cups and qualifications is a prerequisite for a successful run; there are for major competitions (World Championships and published studies upon starting time influence on World Cups are considered as major competitions). the total race time in skeleton (Zanoletti, La Torre, Luge Data Samples Merati, Rampinini & Impelizzeri, 2006), bobsleigh Top-25 results of each heat from World (Leonardi, Cecioni, Dal Monte & Komor, 1985; Championship 2009 and World Cup #7 of season Morlock & Zatsiorsky, 1989), and luge (Brüggemann, 2007/08 were analysed (these Lake Placid events Morlock & Zatsiorsky, 1997). These studies have consist of two heats, thus giving samples of 50 data proved that the start performance indeed has an sets for each competition); 25 results were chosen, important impact on the overall performance of the because best 25 athletes from the first heat of World athletes, but still a good start does not necessarily Championship are admitted for the second heat. lead to a top-ranking in a competition. Additionally first 17 places were added to the study There have been attempts to find whether there is from one-heat events: World Championship 2009 a “crucial” part on the track, which would determine qualification competition, and the Nations Cup #7 2010 Nr. 3(61) 49 2007/08 (according to FIL rules 17 fastest athletes skeleton events; final time interval between the last from qualification participate in World Cup or World intermediate pair of photocells and the finish line Championship). was not included into the correlation analysis.