Running mechanical alterations during repeated treadmill sprints in hot<i>versus</i>hypoxic environments. A pilot study

Girard, Olivier; Brocherie, Franck; Morin, Jean-Benoı̂t; Millet, Grégoire P.

doi:10.1080/02640414.2015.1101482

Cited by 19 publications

(14 citation statements)

References 38 publications

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“…Moreover, in recent years, this technique has been refined with improvements in the estimation of inertial properties of body segments and major accuracy due to an enhanced quality of cameras (resolution > 11 megapixels or 4064x2704; sampling rate > 100 Hz). This approach has been used since the 90's to determine mechanical energy/work 18,19 and recently Morin and co-workers 9,20 developed an interesting and simple method for estimating kvert and kleg starting from kinematics parameters such as contact and flight time. Curiously, the feasibility of motion analysis systems to estimate the running GRF from BCoM is unknown yet.…”

Section: Introductionmentioning

confidence: 99%

Estimates of Running Ground Reaction Force Parameters from Motion Analysis

Pavei

Seminati

Storniolo

et al. 2017

Journal of Applied Biomechanics

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We compared running mechanics parameters determined from ground reaction force (GRF) measurements with estimated forces obtained from double differentiation of kinematic (K) data from motion analysis in a broad spectrum of running speeds (1.94-5.56 m⋅s). Data were collected through a force-instrumented treadmill and compared at different sampling frequencies (900 and 300 Hz for GRF, 300 and 100 Hz for K). Vertical force peak, shape, and impulse were similar between K methods and GRF. Contact time, flight time, and vertical stiffness (k) obtained from K showed the same trend as GRF with differences < 5%, whereas leg stiffness (k) was not correctly computed by kinematics. The results revealed that the main vertical GRF parameters can be computed by the double differentiation of the body center of mass properly calculated by motion analysis. The present model provides an alternative accessible method for determining temporal and kinetic parameters of running without an instrumented treadmill.

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Section: Introductionmentioning

confidence: 99%

Estimates of Running Ground Reaction Force Parameters from Motion Analysis

Pavei

Seminati

Storniolo

et al. 2017

Journal of Applied Biomechanics

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“…Acknowledgment of our research is the research data (Kashuba, Khmelnitska, & Krupenya, 2012;Jagiello, Kalina, Klimczak, Ananczenko, Ashkinazi, & Kalina, 2015;Olivier Girard, Frank Brocherie, Jean-Benoit Morin, & Gregory P. Millet, 2016), which show that in martial arts at the initial stages of hypoxic preparation, the increase in FeO 2 is a stimulator of increased ventilation of the lungs, which is due to the respiratory rate with a slight decrease in the depth of breathing. One of the mechanisms of adaptation to hypoxia is the rate of gas exchange in the lungs and the delivery of O 2 by blood to the working muscles (Hochachka, Rupert, & Monge, 1999;Bernardi, Passino, & Wilmerding, 2001;Kolchinskaya, Tsiganova, & Ostapenko, 2003).…”

Section: ------------------------------------------------------------mentioning

confidence: 83%

“…Modern professionalism in sports causes a lot of problems, one of which is a significant extension of sports activities. Despite the established factors for reducing physical performance and competitive performance, scientists in many countries are trying to find ways to optimize the training process to extend the competitive activity of athletes (Khudolii, Iermakov, & Ananchenko, 2015;Olivier Girard, Frank Brocherie, Jean-Benoit Morin ,& Gregory P. Millet, 2016).…”

Section: Discussionmentioning

confidence: 99%

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2018

JPES

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Purpose: to determine the possibility of increasing the level of physical preparedness for competitive judoist activity by means of hypoxic influences at the stage of gradual reduction of sport achievements. Result: after ten sessions of hypoxic effect during recurrent respiration in confined space and circular special training, a significant increase in the level of physical fitness and competitive activity of judo athletes is observed. The research materials are based on the laws of adaptation of the organism to a gradual decrease in the volume of oxygen (O 2) in the respiratory air. In the process of integrated hypoxic training (IHT) cardiovascular (respiratory system) and respiratory systems (pulmonary ventilation (RMV), respiratory rate (RR), oxygen utilization factor (OUF 2) were recorded, in addition, the percentage of carbon dioxide (FeCO 2) and oxygen (FeO 2) in the exhaled air were determined. To determine the dependence of the level of athletes 'preparedness on hypoxic stability, the linear multiple regression coefficient was used, which determines the level of each factor in the development of the level of physical qualities and indicators of athletes' competitive activity. Calculation of the coefficient of reverse step regression makes it possible to establish the most important factors in hypoxic productivity. Materials of the study: indicate the need to include in the training process hypoxic effects. The competition activity of judoists is carried out under the influence of complex hypoxic influences and therefore the inclusion of IHT and special physical hypoxic influences contributes to an increase in the level of anaerobic performance and special competitive activity. Conclusions: results of the conducted studies determined the adaptive patterns of the oxygen transport system of judoists to hypoxic influences at the stage of gradual reduction of sport achievements. Inclusion in the training process of interval hypoxic training and special sports hypoxic exercises contributed to an increase in the level of physical fitness and competitive activity, which gives grounds for the introduction of hypoxic means in practice.

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“…Adaptation mechanism to hypoxic hypercapnia is the complex integral reaction in which intrasystemic and intersystem rebuilding of the organism is manifested, which causes the special working capacity [9,14,18].…”

Section: Discussionmentioning

confidence: 99%

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2017

JPES

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Purpose: to develop a method of hypoxic training to increase the level of special physical fitness of karate sportsmen. The research tasks: to carry out the analysis of scientific and methodological literature on the determination of the laws of adaptation of the athlete's organism to the conditions of hypoxia; to determine the state of special physical preparedness of karate sportsmen of 16-17 years old; to develop the method of hypoxic training by the method of recurrent respiration into the closed space; To determine the most important factors in raising the level of special physical preparedness of karate sportsmen aged 16-17. Results: Ten sessions of hypoxic exposure during recurrent respiration in the closed space were performed. Interval hypoxic training was carried out on the basis of the body's reaction to the gradual decrease the volume of oxygen in the respiratory air. During the reverse breathing, the parameters of the cardiovascular system and the respiratory system were recorded in the closed space. The use of regression analysis made it possible to determine the main factors ensuring the duration of recurrent respiration. Research materials indicate studying testify the need for carrying out hypoxic training, since the increase in adaptability to hypoxia is the mechanism for the development of the special working capacity of karate sportsmen of 16-17 years old. Conclusions: the results of the study deepen information about the features of adaptive mechanisms to certain competitive activities. Inclusion of interval hypoxic training in the training process contributed to a more significant increase in the anaerobic performance of karate sportsmen of 16-17 years old.

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Running mechanical alterations during repeated treadmill sprints in hotversushypoxic environments. A pilot study

Cited by 19 publications

References 38 publications

Estimates of Running Ground Reaction Force Parameters from Motion Analysis

Estimates of Running Ground Reaction Force Parameters from Motion Analysis

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