Cristian Osgnach

We have previously shown that accelerated running on flat terrain is biomechanically equivalent to running uphill at a constant speed. This hypothesis was further investigated comparing the energy cost of running at a constant speed either uphill, or on flat terrain against an equivalent horizontal impeding force, mimicking acceleration. Steady-sta...

PurposeThis manuscript is devoted to discuss the interplay between velocity and acceleration in setting metabolic and mechanical power in team sports.Methods To this aim, an essential step is to assess the individual Acceleration-Speed Profile (ASP) by appropriately analysing training sessions or matches. This allows one to estimate maximal mechani...

PurposeAcceleration phases require additional mechanical and metabolic power, over and above that for running at constant velocity. The present study is devoted to a paradigmatic example: the 100-m dash, in which case the forward acceleration is very high initially and decreases progressively to become negligible during the central and final phases...

GPS system are massively spread in outdoor team sport and permit to obtain large numbers of KPI to monitorand interpret physiological implications in sports. Considering legacy from physiology and experience from other sports, it seems to be interested to investigate potential benefit of intensity distribution over time durations. This article aims...

PurposeTheoretical 100-m performance times (t100-m) of a top athlete at Mexico-City (2250 m a.s.l.), Alto-Irpavi (Bolivia) (3340 m a.s.l.) and in a science-fiction scenario “in vacuo” were estimated assuming that at the onset of the run: (i) the velocity (v) increases exponentially with time; hence (ii) the forward acceleration (af) decreases linea...

Assessing football players' sprint mechanical outputs is key to the performance management process (e.g. talent identification, training, monitoring, return-to-sport). This is possible using linear sprint testing to derive force-velocity-power outputs (in laboratory or field settings), but testing requires specific efforts and the movement assessed...

Assessing football players’ sprint mechanical outputs is key to the performance management process (e.g. talent identification, training, monitoring, return-to-sport). This is possible using linear sprint testing to derive force-velocity-power outputs (in laboratory or field settings), but (i) testing requires specific efforts and (ii) the movement...

Assessing football players' sprint mechanical outputs is key to the performance management process (e.g. talent identification, training, monitoring, return-to-sport). This is possible using linear sprint testing to derive force-velocity-power outputs (in laboratory or field settings), but (i) testing requires specific efforts and (ii) the movement...

PurposeMuch like running on a slope, running against/with a horizontal traction force which either hinders/aids the forward motion of the runner creates a shift in the positive and negative muscular work, which in turn modifies the bouncing mechanism of running. The purpose of the study is to (1) investigate the energy changes of the centre of mass...

Maximal absolute speeds in human locomotion range from a minimum of about 7 km⋅h⁻¹ in swimming (100 m free style) to over 70 km⋅h⁻¹ in cycling (200 m with a flying start), whereas the maximal muscular power of elite athletes competing in these events is essentially equal. Hence these large speed differences depend on the specific characteristics of...

Team sports are characterised by frequent episodes of accelerated/decelerated running. The corresponding energy cost can be estimated on the basis of the biomechanical equivalence between accelerated/decelerated running on flat terrain and constant speed running uphill/downhill. This approach allows one to: (i) estimate the time course of the insta...

A previous approach to estimate the time course of instantaneous metabolic power and O2 consumption in team sports has been updated to assess also energy expenditure against air resistance and to identify walking and running separately. Whole match energy expenditure turned out ≈14% smaller than previously obtained, the fraction against the air res...

Purpose: To assess the efficacy of critical metabolic power derived from variable-speed movement for classifying intensity in team sport activity. Methods: Elite male hockey players (n = 12) completed a series of time trials (100 yd, 400 yd, 1500 yd) and a 3-min all-out test to derive both critical speed (CS) and critical power (CP). Heart rate...

The time course of metabolic power during 100 to 400 m top running performances in world class athletes was estimated assuming that accelerated running on flat terrain is biomechanically equivalent to uphill running at constant speed, the slope being dictated by the forward acceleration. Hence, since the energy cost of running uphill is known, ener...

After a brief overview of the principles underlying the assessment of the energy cost of accelerated/decelerated running on flat terrain, as obtained from the biomechanical equivalence between this last and uphill/downhill running at constant speed, metabolic power and actual O₂ consumption (VO₂) will be estimated during a typical training drill an...

Introduction Player profile determination is it an important point to obtain best benefits as possible managing the workload. Peronnet et al. indentified athlete’s profile based on best average speed that there are able to maintain on time period [1]. Recently Pinot et al. developed ”Record Power Profile” to assess performance in cycling [2] based on po...

https://www.thieme-connect.de/products/ejournals/abstract/10.1055/s-0035-1569321 In recent years, advances in GPS technology combined with a better understanding of the energetics of accelerated and decelerated running [5] have made it possible to estimate: i) the time course of the instantaneous metabolic power requirement of any given player in...

To estimate the energetics and biomechanics of accelerated/decelerated running on flat terrain based on its biomechanical similarity to constant speed running up/down an 'equivalent slope' dictated by the forward acceleration (a f). Time course of a f allows one to estimate: (1) energy cost of sprint running (C sr), from the known energy cost of up...

Video match analysis is used for the assessment of physical performances of professional soccer players, particularly for the identification of "high intensities" considered as "high running speeds." However, accelerations are also essential elements setting metabolic loads, even when speed is low. We propose a more detailed assessment of soccer pl...