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The influence of stroke mechanics into energy cost of elite swimmers
Barbosa, Tiago M.; Fernandes, R.J.; Keskinen, K.L.; Vilas-Boas, J.P.The purpose of this study was to analyze the relationships between energy cost (C), swimming velocity (v), stroke frequency (SF) and stroke length (SL) in toplevel swimmers. Eighteen elite swimmers (four freestylers, five backstrokers, five breaststrokers and four butterflyers) performed an intermittent set of n 9 200 m swims (n B 8) with increasing velocity. The oxygen consumption was measured breath-by-breath...
A mecânica da braçada enquanto factor predictivo do custo energético em nadador...
Barbosa, Tiago M.; Fernandes, R.J.; Keskinen, K.L.; Vilas-Boas, J.P.Estudaram-se as relações entre o custo energético (Ċ), a frequência gestual (FG) e a distância de ciclo (DC), em nadadores de elite portugueses. Foram estudados 4 nadadores a Crol, 5 a Costas, 4 a Mariposa e 5 a Bruços. Os nadadores foram submetidos a um protocolo incremental de n*200 m (n ≤ 8). Os aumentos da FG induziram aumentos significativos do Ċ em todas as técnicas de nado. Aumentos da DC promoveram aume...
Swimming bioenergetics: integrating biomechanical and physiological data into a...
Vilas-Boas, J.P.; Fernandes, R.J.; Barbosa, Tiago M.; Keskinen, K.L.The purpose of the present paper is to synthesise a number of scientific contributions of our research group, into a coherent corpus of knowledge related to swimming biophysics, specially centred on the availability and use of energy in swimming. After an introductory part that intends to underline the relevance of this approach base on the conceptualization of the swimmer, and swimming action itself, as a ther...
Performance diagnosis in swimming
Vilas-Boas, J.P.; Fernandes, R.J.; Barbosa, Tiago M.; Keskinen, K.L.Energy expenditure as a function of swimming velocity is one of the major topics of interest in swimming science. Understanding the mechanisms behind swimming performance and training need new scientific approaches, while most of the existing knowledge on the bioenergetics of the four swimming strokes has already a number of years. The purpose of this presentation is to synthesize the most recent contributions ...
Evaluation of the energy expenditure in competitive swimming strokes
Barbosa, Tiago M.; Fernandes, R.J.; Keskinen, K.L.; Colaço, P.; Cardoso, Carla; Silva, J.; Vilas-Boas, J.P.The purpose of this study was to measure and compare the total energy expenditure of the four competitive swimming strokes. Twenty-six swimmers of international level were submitted to an incremental set of 200-m swims (5 swimmers at Breaststroke, 5 swimmers at Backstroke, 4 swimmers at Butterfly and 12 swimmers at Front Crawl). The starting velocity was approximately 0.3m· s–1 less than a swimmer’s best perfor...
Time limit at the minimum velocity of VO2max and intracyclic variation of the v...
Balonas, A.; Gonçalves, P.; Silva, J.; Marinho, D.A.; Moreira, P.; Lima, A.B.; Barbosa, Tiago M.; Keskinen, K.L.; Fernandes, R.J.; Vilas-Boas, J.P.The purpose of this study was to analyse the relationship between time limit at the minimum velocity that elicits maximal oxygen consumption (TLim-vVO2max) and intra-cyclic variations of the velocity of the centre of mass (dv) in the four competitive swimming techniques. Twelve elite male swimmers SWIMMING BIOENERGETICS Rev Port Cien Desp 190 6(Supl.2) 185–197 swam their own best technique until exhaustion at t...
Assessment of time limit at lowest speed corresponding to maximal oxygen consum...
Fernandes, R.J.; Cardoso, Carla; Silva, J.; Vilar, S.; Colaço, P.; Barbosa, Tiago M.; Keskinen, K.L.; Vilas-Boas, J.P.Time limit at lowest speed of maximal oxygen consumption (TLim-v O2max) was characterized in the 4 swimming strokes, and related with O2max and anaerobic threshold (AnT). 23 elite swimmers performed an incremental protocol for v O2max assessment. 48 hours later, Tlim-v O2max was assessed. O2 was directly measured BxB (K4 b2, Cosmed, Italy) and AnT was assessed individually (YSI 1500L Sport, USA). Tlim-v O2max v...
Factores biomecânicos e bioenergéticos limitativos do rendimento em natação pur...
Barbosa, Tiago M.; Keskinen, K.L.; Vilas-Boas, J.P.Um dos objectivos prioritários da Biomecânica do Desporto é o de, num primeiro momento, caracterizar um determinado padrão motor e, num segundo momento, intervir no sentido de incrementar a efi ciência motora. Esse incremento da efi ciência do gesto tem como fi nalidade última permitir que o seu executante aceda a níveis superiores de rendimento desportivo. Do exposto, emerge a ideia que a Biofísica encontrase ...
Relationship between energy cost, swimming velocity, speed fluctuation in compe...
Barbosa, Tiago M.; Lima, A.B.; Portela, A.; Novais, D.; Machado, L.; Colaço, P.; Gonçalves, P.; Fernandes, R.J.; Keskinen, K.L.; Vilas-Boas, J.P.The purpose of this study was to analyse the relationships between the total energy expenditure ( tot), the energy cost (EC), the intra-cycle variation of the horizontal velocity of displacement of centre of mass (dv) and the mean swimming velocity (v) in the four competitive swimming strokes.
Assessment of time limit at VO2max velocity in the 4 competitive swimming techn...
Fernandes, R.J.; Cardoso, Carla; Silva, J.; Vilar, S.; Colaço, P.; Barbosa, Tiago M.; Keskinen, K.L.; Vilas-Boas, J.P.Time limit at the minimum velocity that elicits maximal oxygen consumption (TLim-v O2max) was studied both in flume (Billat et al., 1996) and in normal swimming conditions (Fernandes et al., 2003). While no studies have been carried out based on other swimming techniques than freestyle, the purpose of this experiment was to characterize, and compare, TLim-v O2max in the four competitive strokes, as well as to o...
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