Explosive strength, a function of rate of force development (RFD), is a primary determinant for the amount of peak force that can be produced in critical sport performance time periods ( e.g. foot contact time). Evidence indicates that maximum strength and RFD are correlated. However, the characteristics of this relationship are not well established among athletes. This study examined the relationship of peak isometric force (IPF) and RFD from a mid-thigh pull, among male and female track and field athletes. Athletes were 12 sprinters (S), 10 jumpers (JP) and 12 cross-country runners (XC). Force-time curve analysis was conducted for each (2 trials) isometric pull and averaged for analyses. IPF and RFD from 0 - 200 ms were determined from appropriate curves. IPFs were normalized using an allometric (IPFa) scaling equation: absolute force/ (body mass (kg)0.67). ICCs were previously shown to be > 0.9. Relationships were established with Pearson's r; statistical differences with a Bonferroni adjusted t-Test. IPF, IPFa and RFD were greater in males than females for S and JP but not for XC. IPF, IPFa and RFD were greater for S and JP compared to XC. Similar relationships of IPF to RFD were noted among groups S(r = 0.85), JP (r = 0.87), XC (r = 0.88). Among males, n = 19, the relationship ofIPF to RFD was r = 0.89 and was somewhat higher compared to females, n = 15, (r = 0.78). Overall (n = 34) relationship between IPF and RFD was r = 0.90. These data indicate a strong relationship between maximum strength and "explosiveness" that is independent.

Problem: Track and field athletes, along with cross-country athletes have multiple and back to back seasons, creating overuse injuries. Stress fractures or stress reactions to the bone are the overuse injuries focused on in this study and literature review. There is a lack of information in the literature regarding stress reactions. Purpose: The goal of the study is to understand more information about stress reactions to bone and possibly increase the knowledge of health care professionals. Methods: Three case studies were examined through pre-existing medical chart notes and athletic trainer's notes regarding the stress reactions. A literature review was also performed to provide further information about stress fractures and stress reactions. Conclusions: There are multiple risk factors for stress injuries. All three of the athletes in the case studies are female, which is found to be a risk factor. Many risk factors need more studies to provide support. Magnetic Resonance Imaging (MRI) was obtained in all three case studies where there was found to be a stress reaction. These three females also had a recent increase in activity level and had similar symptoms to each other and what is found in the literature.

Background and aim The pace of development of distance running shoes has been fast-forward since 2016 when Nike introduced their model Nike Zoom Vaporfly, with an imbedded carbon fiber plate and an advanced newly developed Pebax®-foam. The shoe-development has continued to track events, with the introduction of carbon fiber plate in several shoe-models for running and sprint- events. The research area for track events has not reached the level as for distance running shoes, therefore the aim of this study was to examine the effects on long jump performance when using long jump spikes with (AFT) compared to without (non-AFT) a carbon fiber plate.  Method Nine experienced male (n=6, age 22 ± 4.8 years, body mass 76.4 ± 3.5 kg, height 182 ± 4.9 cm), and female (n=3, age 20.3 ± 3.5 years, body mass 64.8 ± 6.0 kg, height 172 ± 2.0 cm) Swedish long jumpers performed three maximal effort long jumps in AFT and non-AFT long jump shoes. Three-dimensional kinematic data was captured with eight markerless motion capture cameras, and the take-off was performed from a force plate. Run-up velocity was measured using a lidar laser and step characteristics using an optical contact grid. Pearson’s correlation coefficient was calculated for jump distance and maximal run-up velocity and paired samples t-tests and a Wilcoxon rank sum test were conducted to examine differences between the shoes.  Results Peak run-up velocity correlated with jump distance both for AFT (Pearson’s r=0.919, p<0.001) and non-AFT shoes (Pearson’s r=0.910, p<0.001). At a group-level no statistical differences were found between the shoes for the run-up variables. The AFT shoes showed significantly greater horizontal velocity at touchdown (p=0.046) and vertical velocity difference from touchdown to toe-off (p=0.029) compared to the non-AFT shoes. No other significant difference was found on group level for the take-off variables. Conclusion The results in this study did not show a longer jump distance in long jump specific AFT shoes compared to non-AFT on a group level, but individual differences were seen. To further understand the effect of AFT shoes on long jump performance, more studies on different individual characteristics and their relation to long jump performance is needed. Keywords Long jump, super spikes, AFT-shoes, carbon fiber plate, biomechanics. / Bakgrund och syfte Sedan Nike 2016 introducerade sin skomodell Nike Zoom Vaporfly har utvecklingen av löparskor med en inbäddad kolfiberplatta och nyutvecklade med energiåtergivande material snabbt fortskridit. Utvecklingen av skor har fortsatt från löparspåren till friidrottsbanan för flera grenar. Forskningsområdet för grenspecifika skor har inte kommit lika långt som för distanslöparskor, därför var syftet med denna studie att undersöka effekterna på längdhoppsprestation av att använda längdhoppsspecifika spikskor med (AFT) jämfört med utan (non-AFT) kolfiberplatta. Metod Nio erfarna manliga (n=6, ålder 22 ± 4,8 år, kroppsvikt 76,4 ± 3,5 kg, längd 182 ± 4,9 cm) och kvinnliga (n=3, ålder 20,3 ± 3,5 år, kroppsvikt 64,8 ± 6 kg, längd 172 ± 2 cm) svenska längdhoppare gjorde tre maximala längdhopp i AFT och non-AFT längdhoppsskor. Tredimensionell kinematisk data samlades in med åtta markörlösa motion capture-kameror och uthoppet skedde från en kraftplatta. Ansatshastigheten mättes med en laserkamera och steg-specifik data med ett optiskt kontaktnät. Pearson’s korrelations koefficient beräknades for hopplängd och maximal ansatshastighet samt så genomfördes paired samples t-test och Wilcoxon rank sum test för att undersäka skillnaderna mellan skorna. Resultat Maximal ansatshastighet korrelerade med maximal hopplängd både för AFT skor (Pearsons r=0,919, p<0,001) och non-AFT skor (Pearsons r=0,910, p<0,001). På gruppnivå hittades ingen statistisk skillnad mellan skorna vad gäller ansatslöpningens variabler. AFT skorna visade en signifikant högre horisontell hastighet vid första markkontakt med kraftplatta (p=0,046) och vertikal hastighetsdifferens från första markkontakt med kraftplatta till sista markkontakt med kraftplatta (p=0,029) jämfört med non-AFT-skor. Ingen annan signifikant skillnad hittades på gruppnivå vad gäller uthoppsvariabler. Slutsats Resultaten i denna studie visade inte på en längre hopplängd i längdhoppsspecifika AFT skor jämfört med icke-AFT skor på gruppnivå men skillnader sågs på individnivå. För att ytterligare förstå effekten av AFT skor på längdhoppsprestation behövs fler studier om olika individuella egenskaper och dess relation till längdhoppsprestation. Nyckelord Längdhopp, super spikes, AFT-skor, karbonfiberplatta, biomekanik.

This study deals with an investigation of letterman in track in North Texas State Teachers College during the ten- year period of 1930-31 through 1939-40, as compared with football lettermen of the same period. More especially, it is a study of the program, the accomplishments, and the later occupations followed by the individual athletes who earned letters in track. The status of the athletes was considered from the standpoint of their athletic and scholastic attainments as well as their social activities while in college, The athletes were also considered from the standpoint of position and location since leaving college. It is recommended that in the near future a similar study be made of the other sports in North Texas State College to parallel this study.

Abstract Title: 800 meters elite runner training analysis Objectives: The main goal of my thesis deals with pedagogical evaluation of 800 meters elite runner training process. It concerns analysis of teoretical background esential for the performance growth of the two annual macrocycles through 2007/2008 and 2008/2009. I mainly focused on the relationship between the volumes of general and specific training indicators and achieved performance indicator in tracked event. The conslusion of the work should provide us with recommendations for the training process improvement in future periods. Methods: The education analysis of training process is based on the values that were obtained by content analysis of training documents and training records of the coach. I used a percentage expression for a quantitative comparison. For the qualitative comparison I used a distribution of training indicators devided into 17 categories, 5 as indicators of general training and 12 as special indicators. Results: The growth of sports performance in 800 meters discipline was primarily achieved by training loads of special training indicators and focus on its main field. The resulting performance was most influenced by changes in speed and special endurance development, which were supported by the growth of tempo and...

The thesis elaborates on relations between PE or sports in general, and mathematics. The author focuses on a practical application of numbers on sports such football, swimming, track and field, downhill skiing and Olympic games. Moreover, the mentioned numerical methods are further used for writing a workbook of model exercises for grammar schools. The thesis is divided into two main chapters ? theoretical and practical. The theoretical part consists of selected sports which are expressed and described by numbers and formulas. In the practical part, a reader can find the workbook of model exercises which has been completed using all the mathematical sources discussed in the theoretical part. There are also correct solutions exercises available for self-studying students.

Syfte och frågeställning Syftet med studien är att studera hur svenska elitlöpares totaltider förhåller sig till de olika variablerna markkontakt, flygtid, hastighet, stegfrekvens och steglängd, med största fokus på hur markkontakterna påverkar hastigheten. Studiens två frågeställningar var: (1) Hur ser sambandet ut mellan de fyra variablerna markkontakt, flygtid, steglängd samt stegfrekvens vid den maximala hastigheten vid upprätt löpning hos elitlöpare verksamma inom sprintdistansen 100 meter? (2) Hur korrelerar markkontakt och hastighet hos elitlöpare verksamma inom sprintdistansen 100 meter? Metod En kvantitativ studie genomfördes där 33 manliga och 20 kvinnliga försökslopp på flygande 30 kartlades med mätutrustningen Optojump. Dessa mätvärden analyserades i SPSS för att jämföra korrelation mellan varje mätvärde, ett sambandsdiagram mellan markkontakt och hastighet gjordes samt den översiktliga statistiken analyserades. Resultat Resultaten visar att kortare markkontakter kan ge en högre hastighet, att flygtiden mellan män och kvinnor är lika, att genomsnittet av löparna i studien hade än lägre stegfrekvens och steglängd än litteraturen som presenteras i studien. Slutsatser Resultatet i studien visar att, i likhet med forskningsstudier, att en kortare markkontakt kan ge en höge horisontell löphastighet än en lång. Studien åskådliggör dock att betydligt fler variabler, än endast markkontakt, har stor inverkan på hastighet och totaltid. Jämfört visar detta att mer forskning inom området behövs för att kunna optimera träningsupplägg för löpare. / Purpose and question The purpose of the study is to show how Swedish elit runners total times relate to the different variables ground contact, flight time, speed, step rate and step length, with the main focus on how the ground contacts time affect speed. The study's two main questions were: (1) What is the relationship between the four variables: ground contact, flight time, step length and the velocity at the maximum speed at upright running (2) How do the variable ground contact and velocity correlate between elite runners competing within the track and field event 100 meters? Method A quantitative study was conducted in which 33 male and 20 female runs attempts were mapped with the measuring equipment Optojump. These measured values were analyzed in SPSS to compare correlation between each measurement value, a scatterplot between ground contact and speed, and the summary statistics were taken out. Results The results show that shorter ground contacts times can provide a faster running velocity, that the flight time between men and women is equal, the average of the runners in the study have lower step rate and step length then the literature presented in the study. Conclusions The result of the study shows that, like research studies, a shorter ground contact time can provide a higher horizontal running speed than a longer ground contact. However, the study illustrates that significantly more variables, than only ground contact, have a major impact on velocity and total time. In comparison, this shows that more research in the field is needed to optimize training for runners.

1948年5月，上海舉辦第七屆全中國運動會，臺灣首次組隊參賽即一鳴驚人，榮獲男子田徑總冠軍，同時更展現守秩序、法紀律、團結合作、服從裁判的運動精神。不論場內的運動實力和場外的運動風範，皆被大會評為「全國第一」。究其因，實肇基於日本統治期間致力發展體育運動所展現的成果。事實上，臺灣在日本統治之前，近代式體育運動僅在西洋勢力所及的範圍內施行，成效自是相當有限，迨至日治時期，乃藉由學校教育與社會體育兩大方向，開始全面性、普遍地提倡體育運動而獲致相當程度的發展成果。值是之故，本論文主旨即在探討日本統治下的臺灣，究竟為何／如何發展體育運動，以及有何成效。 本文係以當時臺灣地區運動員的競賽為主，包含內地人(日本人)、本島人(臺灣人)以及高砂族(原住民)，因為此三種族群皆是當時臺灣運動代表隊的組成份子，以做為主要的論述對象更能得知當時臺灣體育運動的發展情況。在論文內容方面，首先，從近代西洋體育運動的興起與發展談起，隨著歐美列強國力的擴張將其科技文明與生活形態傳至亞洲，再至日本明治維新前後追求改善國民體格而向學習歐美體育運動，而臺灣即在此時代背景之下被納為日本殖民地。其次，探討日治時期各界人士對於體育運動所提出的觀念看法，以說明發展體育運動的動機與目的。再次，討論推行體育運動的主要機構，主要著眼於人事、經費以及如何運作等方面，以瞭解是由哪些人／在什麼樣的時代背景之下／如何從事體育運動的發展。第四、討論臺灣運動選手參加各項運動競賽的成績表現，主要以全島性比賽，以及與鄰近的朝鮮、滿洲、日本、菲律賓等地的比賽成績作較，可大致明瞭臺灣的運動技術水準。第五、分析社會領導階層人士所從事的休閒運動，以考察當時是哪些休閒運動最受是有錢有閒階級的喜愛，並從中討論體育運動的發展概況。 經由本文的討論發現，日治時期體育運動的發展係在官方強力主導、民間配合實施之下進行推廣。其次，臺灣的體育組織是日本帝國體育組織在殖民地的分支機構，臺灣全島性的運動比賽成為日本全國性比賽的地方預選賽，臺灣優秀的運動選手與隊伍在島內勝出者即成為地區性代表隊，順理成章前往日本參加更高層級的比賽。此外，體育是現代教育不可偏廢的項目，不僅能改善個人體格發育，也有助促進健康衛生；同時，體育並非僅是單純的身體運動而已，有時亦被視為國力的象徵，發展體育運動有助陶冶國民性格和促進日臺融合。最後，隨著日本統治的時間漸久以及統治程度的強化，臺灣體育運動呈現日漸普及的趨勢，而另一方面，則漸帶有濃厚的日本色彩，甚至許多日式運動術語發至今仍是使用中的辭彙即是明證。至於日治時期臺灣體育運動的成績表現究竟如何呢？整體而言，不僅與殖民母國日本仍然相去甚遠，即便連同為殖民地的朝鮮、滿洲、菲律賓等地亦有所不及。然而，雖然未見日治時期臺灣運動選手與中國正面交手的紀錄，但從1948年的上海全國運動會成績可推知，日治臺灣體育運動的整體水準，似乎不在同時期的中國之下。 關鍵字：日治時期 臺灣 體育史 體育觀 武德會 體育俱樂部 臺灣體育獎勵會 臺灣體育協會 明治神宮體育大會 甲子園 網球 棒球 田徑 游泳 登山 馬術 高爾夫 / In May 1948, the 7th China Sports Game was held in Shanghai. The athletic performance of male track and field athletes amazed the world by winning the overall championship though it was the debut of Taiwan in this athletic event. These male athletes disciplined themselves, obeyed the rules, cooperated with one another, obeyed the referees’ orders, and exhibited good sportsmanship. Both their athletic performance and sportsmanship on the sports field or beyond sports field were ranked as “national champion” by the sponsor. Their great performance actually was the achievement from the devotion to developing athletic sports during Japanese Occupation Period. In fact, before the colonization of Japan, modern athletic sports in Taiwan were only practiced in few regions where foreigners aggregated and the effect of athletic performance was quite limited. The overall promotion of athletic sports was put into practice through school education and social sports activities until the Japanese Occupation Period and so was the great performance achieved at that time. The main purpose of this study is to investigate why and how the Japanese developed athletic sports in Taiwan and the effects. The research subjects were mainly the athletes at that time in Taiwan, including the Japanese, the Taiwanese, and the aboriginals (indigenous people) since these three groups were all members of sports representatives in Taiwan at that time. These subjects were investigated to find out about the development of athletic sports in Taiwan at that time. Firstly, the study probed into the rise and the development of modern western athletic sports. With the expansion of national powers of European countries and the U.S., their science, technology, and life styles were spread to Asia. Moreover, after Meiji Restoration, the Japanese started to put emphasis on improving their physique and hence learnt the western athletic sports. And Taiwan was colonized by Japan under this background. Secondly, it investigated the concepts and viewpoints on athletic sports proposed from all walks of life during Japanese Occupation Period to demonstrate the motives and purposes of athletic sport development. Thirdly, it investigated the major facilities responsible for promoting athletic sports from the aspects of personnel matters, funds, and the operation methods to understand who were involved, how they developed athletic sports, and under what kind of background were athletic sports developed. Fourthly, it investigated the performance of athletes in each kind of sports games, especially national games. The study also compared the athletic performance of Taiwan with that of nearby countries such as Korea, Manjou, Japan, and Philippine to understand the athletic level of Taiwan. Fifthly, it analyzed the leisure sports that the leaders of the society engaged in to explore the preferences of leisure sports of the rich at that time and further investigate the profile of athletic sports development. This study found that the development of athletic sports in Taiwan during Japanese Occupation Period was dominated by the government with the cooperation of non-government in promotion. The sports organizations in Taiwan were the colonial branches of sports organizations in Japanese Empire and the national sports competitions in Taiwan became local preliminaries of Japanese national competitions. The outstanding athletes in Taiwan and the winners of local preliminaries would become the local sports representatives to participate in competitions of higher level in Japan. In addition, the study found that physical education is indispensable in modern education, which not only improves the physical development of individuals but also improves health. Meanwhile, athletic sports ability not simply teaches a kind of physical movement and it is sometimes viewed as a symbol of national powers. The development of athletic sports helped cultivate the personality of people and improved the integration ethnic integration between Taiwan and Japan. With the increase of colonization time and the reinforcement of governance, the athletic sports in Taiwan gradually became more and more popular. On the other hand, it was found that the sports activities in Taiwan was greatly influenced by Japan and even the Japanese sports vocabularies are still used now in sports activities. As for the athletic performance of Taiwan during Japanese Occupation Period, as a whole, the athletic performance of Taiwan was better than Japan and other colonies of Japan, such as Korea, Manjou, and Philippine. Although the athletes in Taiwan during Japanese Occupation Period did not compete with the athletes of China, it could be inferred from their athletic performance that the overall level of athletic sports in Taiwan during Japanese Occupation Period was equivalent to that of China. Keywords: Japanese Occupation Period, Taiwan, sports history, viewpoint of sports, Dai-Nippon Butokukai, sports club, Taiwan sports sponsorship association, Taiwan sports association, Meigi-jingu Athletic Meet, Koshien, tennis, baseball, track and field, swimming, mountain climbing, equestrian, golf