Populations that utilize deep water running (DWR) are described in Chapter I. A review of the literature concerning studies comparing peak physiological variables of water exercises (swimming, DWR, & land based running) to land based exercises (cycle ergometer, walking, & running) are presented in Chapter II. The protocols utilized for obtaining peak values on land and in the water along with subject characteristics, statistical methods and description of the training regimen are discussed in Chapter HI. The results, presented in Chapter IV, indicate no interaction between any of the variables measured but a main effect for treadmill V02 peak for the pre- and post testing. Chapter V discusses factors which may limit physiological changes within each training group. Chapter VI contains suggestions for further research.

Greitumas – vienas iš svarbiausių judamųjų gebėjimų. Siekiant išugdyti maksimalųjį bėgimo greitį, treniruočių metu pasitelkiamos tokios pagalbinės priemonės maksimaliams greitumui kelti, kaip bėgimas su sunkmena bei bėgimas su palengvinimu. Kuri iš šių treniravimo priemonių duoda didesnį prieaugį bėgimo greičiui yra mažai studijuota. Todėl šio darbo tikslas buvo išanalizuoti bėgimo su sunkmena ir su palengvinimu įtaką 60 m bėgimo rezultatui. Tikslui pasiekti iškelti uždaviniai: 1. Įvertinti didelio meistriškumo trumpųjų nuotolių bėgikų 60 m bėgimo rezultatus po bėgimo su palengvinimu. 2. Įvertinti nesportuojančiųjų 60 m bėgimo rezultatus po bėgimo su palengvinimu. 3. Įvertinti didelio meistriškumo trumpųjų nuotolių bėgikų 60 m bėgimo rezultatus po bėgimo su sunkmena. 4. Įvertinti nesportuojančiųjų 60 m bėgimo rezultatus po bėgimo su sunkmena. 5. Palyginti bėgimo su palengvinimu bei bėgimo su pasipriešinimu poveikį 60 m nuotolio bėgimo rezultatams. Darbo objektas – bėgimo su palengvinimu ir bėgimo su sunkmena įtaka didelio meistriškumo sprinterių, bei profesionaliai nesportuojančiųjų asmenų, bėgimo greičiui bei atsispyrimo trukmei. Tyrimo metu buvo atlikta bėgimo greičio kitimo analizė naudojant bėgimo parametrų matuoklį SBM – 1. Atsispyrimo trukmei įvertinti buvo naudojamas prietaisas „OptoJump“. Buvo analizuota: didelio meistriškumo trupųjų nuotolių bėgikų bei nesportuojančių asmenų 60 m bėgimo greičio kitimas ir atsispyrimo trukmių palyginimas, bėgant be krūvio ir po bėgimo... [toliau žr. visą tekstą] / Speed – is one of the most important ability of movement. Willing to improve maximum running speed, you need to have some certain helping equipment to improve you maximum speed such as resistance and assistance running. Which is more effective of those two methods nobody knows since there wasn’t enough research done in this case. This research the main point was to analyze assisted and resisted running influence to 60m running result. The following tasks were raised in order to achieve this purpose: 1. To evaluate high level athletes results after 60m assisted running. 2. To evaluate non athlete results after 60m assisted running. 3. To evaluate high level athletes results after 60m resisted running. 4. To evaluate non athletes results after 60m resisted running. 5. To compare resisted and assisted running influence to 60m running results. The object of this research – the influence of assisted and resisted running for high level sprinters and non athletes, running speed and take-off time. During this research has been done analysis how speed varies using speed measurement equipment SBM – 1. To evaluate taking-off time was used device “OptoJump”. Has been analyzed: high level athletes and non athletes 60m running speed variation and taking off duration while running normally and after resisted or assisted running. We can say that running with assistance or resistance before 60m race can help to improve results. We think that after running 60m with resistance will improve... [to full text]

Daily variability of walking and naming economy (WE,") was assessed in eight prepubertal (P), eight adolescent (C) and eight adult females (A) on three separate days. Prior to testing all subjects engaged in 15 minutes of treadmill walking and running and performed a graded treadmill exercise test to maximal effort. On 3 additional days WE and RE were measured during five minutes each of walking and running. The order of exercise was randomized and each bout was separated by ten minutes of rest. A one-way analysis of variance (ANOVA) revealed differences (p < 0.05) in height, weight, sum of skinfolds, BSA, VO=Ax (ml-kg' .min 1), HRmAxbetween P vs C, and A. While there were no significant interactions between group and speed, a two-way ANOVA revealed differences between all three groups for WE and RE (p< 0.05). Repeated measures two-way ANOVA revealed significant day-to-day differences in RE but not WE. Coefficients of variation (CV) for economy were significantly greater for walking (4.33) than running (2.33). CV for WE and RE combined were significantly greater in P (4.43) than A (2.42). These results suggest dust daft variability of WE and RE appears to be a function of maturation and growth, with significance being acheived at the extremes of the maturation scale; the prepubescent child and the fully mature adult Furthermore, for research testing purposes, prepubertal children may require greater than two testing sessions, the amount recommended for adults. / Human Performance Laboratory

Experienced male marathon runners, 9 black and 10 white, with marathon times of 2 hours 45 minutes or faster, acted as subjects for the study, the purpose of which was to determine whether black runners are better suited to marathon running than whites. Body composition was determined by anthropometry. Maximal oxygen uptake (VO₂ max) and other physiological variables were measured during a continuous, speed-incremented treadmill protocol using a computer-aided data acquisition system. Subjects also ran a simulated marathon at 92.5% of the running speed at which the ventilatory threshold (VT) occurred. Physiological, gait and RPE variables were measured at 10 minute intervals during the marathon. Major findings are detailed below:- The VO₂, max averaged 60.4 ∓ 6.5 and 63.2 ∓ 2.9 mI. kg⁻¹.min⁻¹ in the black and white runners respectively and was highly correlated with best marathon race time (r = 0.86 and 0.85 respectively) and VT (r = 0.84 and 0.60 respectively) (p < 0.05). No significant differences existed between the groups in submaximal oxygen uptake (VO₂,) or % VO₂ max utilised at 16 km.hr⁻¹, but the estimated % VO₂ max utilised during a marathon race was higher in the black (89.0 ∓ 5.5%) than the white runners (81. 5 ∓ 3.1%) {p .( 0.05). The % VO₂ max utilised at 16 km.hr⁻¹ (84.8 ∓ 9.1 and 78.6 ∓ 5.8% in the black and white runners respectively) was significantly correlated with the % VO₂, max utilised while racing in the white (81.5 ∓ 3.1%) (r = 0.70) (p < 0.05), but not the black runners (89.0 ∓ 5.5%). The VT occurred at 82.7 ∓ 7.7 and 75.6 :∓ 6.2% VO₂; max in the black and white groups respectively (p < 0.05). Post-marathon blood lactic acid levels were lower in the black (1.30 ∓ 0.26 mmo1.l⁻¹) than the white runners (1.59 ∓ 0.20 mmol.l⁻¹). The respiratory exchange ratio (R) was higher in the blacks than whites when running at 16 km.hr ⁻¹ (1.03 ∓ 0.07 and 0.98 ∓ 0.03 respectively) and during the marathon (p < 0.05). There was no significant difference in pulmonary minute ventilation (Vı) between the groups, but breathing frequency (f) was higher in the black (59 ∓ 12 breaths.min⁻¹) than the white runners (45 ∓ 8 breaths. min⁻¹ ) and tidal volume (V⊤) lower in the black ( 1.33 ∓ 0.16 l.breath⁻¹) than the white runners (1.75 ∓ 0.36 I.breath⁻¹) during submaximal running at 16 km. hr⁻¹ (p < 0.05). The same trend was observed during the marathon run. During the time-course of the marathon f increased and V⊤ decreased In both groups (p < 0.05). Stroke volume decreased and heart rate increased In both groups during the time-course of the marathon (p< 0.05). Cardiac output was therefore maintained. Thermal responses were similar in the two groups. A significant increase in rectal temperature coincided with a decrease in skin temperature and may have been related to an increase in f (r = 0.86 and 0.67 in the blacks and whites respectively), H/R (r = 0.70 and 0.67 respectively) and "local" (leg) RPE (r = 0.84 and 0.82 respectively). It was concluded that black runners were able to run marathon races at a higher % VO₂ more than whites due to the blacks having lower blood lactic acid levels when running at a similar % VO₂ max. Given similar maximal oxygen uptakes, this would enable blacks to run faster. Cardiopulmonary adjustments occur during the time-course of a marathon which maintains Q and Vı

Much is known about running economy while running on level ground surfaces. However, with the dynamic of elevation changes during running, more research is needed to understand how various grades that will favor respective mechanics. PURPOSE: In this study, we focused on determining whether certain running mechanics and anatomy would predict a runner's oxygen uptake between downhill versus uphill running. METHODS: Twenty-one experienced runners completed six 5-min running trials (1 shoe x 3 grades x 2 visits) in a Saucony marathon racing shoe model (Type A) on level (3.83 m/s), uphill (+4% grade at 3.35 m/s), and downhill ( ˆ’4% grade at 4.46 m/s) conditions. These treadmill speeds at each grade were predicted as metabolic equivalents through all grades. We measured submaximal oxygen uptake and carbon dioxide production during the entire trial duration with the last 3 min of each trial being averaged. A best-fitting line was generated through oxygen uptake versus grade to classify whether runners were more economical in uphill or downhill conditions relative to other subjects. The slope of this line indicated whether runners were more economical at uphill or downhill running, where a positive slope represented a more economical uphill versus downhill runner. Various running mechanics were measured using Vicon Nexus and a Bertec treadmill. A linear regression determined any correlations between peak vertical force, stride rate, plantar velocity, and ground time against uphill/downhill running ability. RESULTS: Peak vertical force was the only factor associated with the slope of oxygen uptake versus grade (running grade ability; p < 0.01). The slope of oxygen uptake versus grade averaged 0.076 ± 0.278 ((ml/kg/min) / % grade). CONCLUSION: Runners that naturally prefer a higher peak vertical force when running on level ground led to a lower running grade ability (lower oxygen uptake during downhill versus uphill running).

Populations that utilize deep water running (DWR) are described in Chapter I. A review of the literature concerning maximal and submaximal responses during DWR, shallow water running and swimming is presented in Chapter II. The protocols to elicit maximal responses during DWR and treadmill running (TMR), subject characteristics, and statistical methods employed are described in Chapter III. The results, presented in Chapter IV, indicate that the DWR protocol is a reliable test for eliciting peak oxygen consumption and heart rate. Furthermore, the metabolic responses during DWR are lower than TMR. Chapter V discusses factors which might limit maximal responses during DWR. Chapter VI contains suggestions for further research. Raw data are presented in Appendix A.

Le trail running, course nature de distances, dénivelés et technicités variables, est une discipline récente à la popularité croissante. La performance en trail dépend de nombreux facteurs génétiques, énergétiques, techniques, stratégiques et motivationnels. Parmi ces facteurs, le coût énergétique de la locomotion fait débat. Les études de cette Thèse s'attachent aux corrélations plat/montée de cette variable, au calcul d'un coût en pente à partir d'un coût à plat, à l'influence de la modification forcée de la fréquence de foulée sur l'énergie consommée, et à l'impact de la fatigue générée par un ultra trail sur le coût à plat et en montée. La prise en compte des contraintes musculaires et biomécaniques en trail d'une part, des facteurs influençant l'économie de course d'autre part, ainsi que des résultats de notre principale étude de terrain, nous laissent émettre l'hypothèse que le coût énergétique et ses variations pre/post course à plat/montée, ne sont pas des indicateurs de performance de l'activité. La force, l'endurance de force et le pacing, en plus de la puissance aérobie et de l'endurance, sont les variables testées les mieux corrélées à la performance en ultra trail / Trail running is a discipline with increasing popularity over the last 2 decades. Trail performance depends on many genetic, energetic, technical, strategic and motivational factors. Among these factors, the energy cost of locomotion is debated. The studies in this Thesis focus on the level/graded correlations of this variable, on the calculation of an uphill cost from a level cost, on the influence of a forced modification of stride frequency on running economy, and on the impact of fatigue generated by an ultra trail on level and uphill costs. Taking account of the muscular and biomechanical constraints on the one hand, and the factors influencing the running economy on the other hand, as well as the results of our main field study, we hypothesize that energy cost and its pre/post fatigue variations, are not performance indicators of the activity. Force, endurance of force and pacing, in addition to aerobic power and endurance, are the tested variables best correlated to ultra trail performance

This thesis paper explores barefoot and minimalist running in Ottawa, Ontario and Boulder, Colorado. The objective has been to answer the following questions: how can we understand barefoot and minimalist style running as cultures, how are barefoot and minimalist style running being done in different ways, how do the senses play out and create nuances between barefoot and minimalist style runners. I argue barefoot and minimalist running are distinct cultural forms. I applied an Ingoldian notion of culture that contends cultures are generative, relational, temporal and improvisational. I conducted a multi-site study and I interviewed participants, as well as conducted participant observation. My findings reveal that the different sensations experienced by the two styles of running make them meaningful in different ways. These different sensations and ways of meaning create nuances between barefoot and minimalist running and differentiate them and as a result, there are found to become different cultural forms.

Running economy is well established as a primary determinant of endurance running performance. However, there is a lack of clarity about the preferred measurement of running economy, its primary limiting factors and the most robust methods enhance running economy in highly trained athletes. Therefore, this thesis investigated the running economy of highly trained runners, exploring the reliability and validity of measures of running economy to deduce its most appropriate quantification, the application of innovative methods to enhance our understanding of an athlete s running economy, and a novel training method to enhance running economy. Chapter 3 revealed that energy cost and oxygen cost were shown to provide similarly high levels of reliability (typical error of measurement ~3%) for highly trained endurance runners when assessed using a short-duration incremental submaximal exercise protocol. In chapter 4, the analysis of a large cohort of highly trained endurance runners revealed that energy cost increased in a stepwise manner with increments in running speed (P<0.001), however oxygen cost remained consistent (P=0.54) across running speed; indicating that oxygen cost might not be an appropriate measure of running economy. Chapter 5 demonstrated that the inter-individual variation in the magnitude of changes in energy cost between different gradients (i.e. from flat running to uphill/downhill running) in highly trained runners was low. However, a disparity between the energy saving of running on a -5% gradient (-17%) and the additional energy cost of running on a +5% gradient (+32%) was evident. The cross-sectional and longitudinal analysis of a large cohort of highly trained runners in chapter 6 revealed a small (r=0.25) and moderate (r=0.35) association between energy cost and maximal oxygen uptake, respectively. Finally, chapter 7 demonstrated that eight weeks of supplementary downhill run training at vLTP in existing training programmes does not enhance running economy in already well trained runners (1.22 vs 1.20 kcal kg-1 km-1; P=0.41), despite a significant increase (+2.4%) in the velocity at lactate turnpoint. In conclusion, this thesis demonstrates that energy cost, expressed as kcal kg-1 km-1, provides a reliable and valid method to quantify running economy in trained distance runners. However, further investigation is required to identify robust training methods to enhance running economy in this already highly trained population.

This thesis paper explores barefoot and minimalist running in Ottawa, Ontario and Boulder, Colorado. The objective has been to answer the following questions: how can we understand barefoot and minimalist style running as cultures, how are barefoot and minimalist style running being done in different ways, how do the senses play out and create nuances between barefoot and minimalist style runners. I argue barefoot and minimalist running are distinct cultural forms. I applied an Ingoldian notion of culture that contends cultures are generative, relational, temporal and improvisational. I conducted a multi-site study and I interviewed participants, as well as conducted participant observation. My findings reveal that the different sensations experienced by the two styles of running make them meaningful in different ways. These different sensations and ways of meaning create nuances between barefoot and minimalist running and differentiate them and as a result, there are found to become different cultural forms.