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J. J. Arroyo-toledo – One of the best experts on this subject based on the ideXlab platform.

  • Use of Biotechnology Devices to Analyse Fatigue Process in Swimming Training
    Journal of Medical Systems, 2017
    Co-Authors: V. J. Clemente-suárez, J. J. Arroyo-toledo

    Abstract:

    The aim of the present research was to analyze the acute psycho-physiological response during a high intensity interval training (HIIT) session of trained swimmers. We analyzed blood lactate concentration, heart rate, heart rate variability (HRV), arms isometric strength, rating of perceived exertion (RPE) and cortical arousal before and after a HIIT session in 14 trained swimmers (16.2 ± 2.6 years 169.1 ± 10.2 cm 61.3 ± 9.9 kg). HIIT session consisted in: 4 × 10 m tethered swimming resting 90 s between sets, 3 min rest, 16 × 25 m maximum speed swimming resting 30 s between sets. Blood lactate concentration, cortical arousal, and rating of perceived exertion significantly increased ( p  

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  • Use of Biotechnology Devices to Analyse Fatigue Process in Swimming Training
    Journal of Medical Systems, 2017
    Co-Authors: V. J. Clemente-suárez, J. J. Arroyo-toledo

    Abstract:

    The aim of the present research was to analyze the acute psycho-physiological response during a high intensity interval training (HIIT) session of trained swimmers. We analyzed blood lactate concentration, heart rate, heart rate variability (HRV), arms isometric strength, rating of perceived exertion (RPE) and cortical arousal before and after a HIIT session in 14 trained swimmers (16.2 ± 2.6 years 169.1 ± 10.2 cm 61.3 ± 9.9 kg). HIIT session consisted in: 4 × 10 m tethered swimming resting 90 s between sets, 3 min rest, 16 × 25 m maximum speed swimming resting 30 s between sets. Blood lactate concentration, cortical arousal, and rating of perceived exertion significantly increased ( p  

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  • Use of Biotechnology Devices to Analyse Fatigue Process in Swimming Training
    Journal of Medical Systems, 2017
    Co-Authors: V. J. Clemente-suárez, J. J. Arroyo-toledo

    Abstract:

    The aim of the present research was to analyze the acute psycho-physiological response during a high intensity interval training (HIIT) session of trained swimmers. We analyzed blood lactate concentration, heart rate, heart rate variability (HRV), arms isometric strength, rating of perceived exertion (RPE) and cortical arousal before and after a HIIT session in 14 trained swimmers (16.2 ± 2.6 years 169.1 ± 10.2 cm 61.3 ± 9.9 kg). HIIT session consisted in: 4 × 10 m tethered swimming resting 90 s between sets, 3 min rest, 16 × 25 m maximum speed swimming resting 30 s between sets. Blood lactate concentration, cortical arousal, and rating of perceived exertion significantly increased (p < 0.05) after HIIT. HRV parameters significantly decreased after HIIT, showing an increase in sympathetic nervous system modulation. Results obtained showed the high impact of HIIT sessions on the swimmer's organism, which may be the cause of adaptation in this low volume training sessions.

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V. J. Clemente-suárez – One of the best experts on this subject based on the ideXlab platform.

  • Use of Biotechnology Devices to Analyse Fatigue Process in Swimming Training
    Journal of Medical Systems, 2017
    Co-Authors: V. J. Clemente-suárez, J. J. Arroyo-toledo

    Abstract:

    The aim of the present research was to analyze the acute psycho-physiological response during a high intensity interval training (HIIT) session of trained swimmers. We analyzed blood lactate concentration, heart rate, heart rate variability (HRV), arms isometric strength, rating of perceived exertion (RPE) and cortical arousal before and after a HIIT session in 14 trained swimmers (16.2 ± 2.6 years 169.1 ± 10.2 cm 61.3 ± 9.9 kg). HIIT session consisted in: 4 × 10 m tethered swimming resting 90 s between sets, 3 min rest, 16 × 25 m maximum speed swimming resting 30 s between sets. Blood lactate concentration, cortical arousal, and rating of perceived exertion significantly increased ( p  

    Free Register to Access Article

  • Use of Biotechnology Devices to Analyse Fatigue Process in Swimming Training
    Journal of Medical Systems, 2017
    Co-Authors: V. J. Clemente-suárez, J. J. Arroyo-toledo

    Abstract:

    The aim of the present research was to analyze the acute psycho-physiological response during a high intensity interval training (HIIT) session of trained swimmers. We analyzed blood lactate concentration, heart rate, heart rate variability (HRV), arms isometric strength, rating of perceived exertion (RPE) and cortical arousal before and after a HIIT session in 14 trained swimmers (16.2 ± 2.6 years 169.1 ± 10.2 cm 61.3 ± 9.9 kg). HIIT session consisted in: 4 × 10 m tethered swimming resting 90 s between sets, 3 min rest, 16 × 25 m maximum speed swimming resting 30 s between sets. Blood lactate concentration, cortical arousal, and rating of perceived exertion significantly increased ( p  

    Free Register to Access Article

  • Use of Biotechnology Devices to Analyse Fatigue Process in Swimming Training
    Journal of Medical Systems, 2017
    Co-Authors: V. J. Clemente-suárez, J. J. Arroyo-toledo

    Abstract:

    The aim of the present research was to analyze the acute psycho-physiological response during a high intensity interval training (HIIT) session of trained swimmers. We analyzed blood lactate concentration, heart rate, heart rate variability (HRV), arms isometric strength, rating of perceived exertion (RPE) and cortical arousal before and after a HIIT session in 14 trained swimmers (16.2 ± 2.6 years 169.1 ± 10.2 cm 61.3 ± 9.9 kg). HIIT session consisted in: 4 × 10 m tethered swimming resting 90 s between sets, 3 min rest, 16 × 25 m maximum speed swimming resting 30 s between sets. Blood lactate concentration, cortical arousal, and rating of perceived exertion significantly increased (p < 0.05) after HIIT. HRV parameters significantly decreased after HIIT, showing an increase in sympathetic nervous system modulation. Results obtained showed the high impact of HIIT sessions on the swimmer's organism, which may be the cause of adaptation in this low volume training sessions.

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T N Tarfa – One of the best experts on this subject based on the ideXlab platform.

  • axial Fatigue of a gas nitrided quenched and tempered aisi 4140 steel effect of nitriding depth
    Fatigue & Fracture of Engineering Materials & Structures, 2003
    Co-Authors: N Limodin, Yves Verreman, T N Tarfa

    Abstract:

    Fatigue testing under fully reversed axial loading (R=−1) and zero-to-tension axial loading (R= 0) was carried out on AISI 4140 gas-nitrided smooth specimens. Three different treatment durations were investigated in order to assess the effect of nitriding depth on Fatigue strength in high cycle Fatigue. Complete specimens characterization, i.e., hardness and residual stresses profiles (including measurement of stabilized residual stresses) as well as metallographic and fractographic observations, was achieved to Analyse Fatigue behaviour. Fatigue of the nitrided steel is a competition between a surface crack growing in a compressive residual stress field and an internal crack or ‘fish-eye’ crack growing in vacuum. Fatigue life increases with nitriding depth until surface cracking is slow enough for failure to occur from an internal crack. Unlike bending, in axial Fatigue ‘fish-eye’ cracks can initiate anywhere in the core volume under uniform stress. In these conditions, axial Fatigue performance is lower than that obtained under bending and nitriding depth may have no more influence. In order to interpret the results, special attention was given to the effects of compressive residual stresses on the surface short crack growth (closure effect) as well as the effects of internal defect size on internal Fatigue lives. A superimposed tensile mean stress reduces the internal Fatigue strength of nitrided steel more than the surface Fatigue strength of the base metal. Both cracking mechanisms are not equally sensitive to mean stress.

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  • Axial Fatigue of a gas‐nitrided quenched and tempered AISI 4140 steel: effect of nitriding depth
    Fatigue Fracture of Engineering Materials and Structures, 2003
    Co-Authors: N Limodin, Yves Verreman, T N Tarfa

    Abstract:

    Fatigue testing under fully reversed axial loading (R=−1) and zero-to-tension axial loading (R= 0) was carried out on AISI 4140 gas-nitrided smooth specimens. Three different treatment durations were investigated in order to assess the effect of nitriding depth on Fatigue strength in high cycle Fatigue. Complete specimens characterization, i.e., hardness and residual stresses profiles (including measurement of stabilized residual stresses) as well as metallographic and fractographic observations, was achieved to Analyse Fatigue behaviour. Fatigue of the nitrided steel is a competition between a surface crack growing in a compressive residual stress field and an internal crack or ‘fish-eye’ crack growing in vacuum. Fatigue life increases with nitriding depth until surface cracking is slow enough for failure to occur from an internal crack. Unlike bending, in axial Fatigue ‘fish-eye’ cracks can initiate anywhere in the core volume under uniform stress. In these conditions, axial Fatigue performance is lower than that obtained under bending and nitriding depth may have no more influence. In order to interpret the results, special attention was given to the effects of compressive residual stresses on the surface short crack growth (closure effect) as well as the effects of internal defect size on internal Fatigue lives. A superimposed tensile mean stress reduces the internal Fatigue strength of nitrided steel more than the surface Fatigue strength of the base metal. Both cracking mechanisms are not equally sensitive to mean stress.

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