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Anthony J. Blazevich - One of the best experts on this subject based on the ideXlab platform.
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Increased fascicle length but not patellar tendon stiffness after accentuated Eccentric-Load strength training in already-trained men
European Journal of Applied Physiology, 2020Co-Authors: Simon Walker, Robert U Newton, Joanne Trezise, Guy Gregory Haff, Keijo Häkkinen, Anthony J. BlazevichAbstract:Purpose This study examined whether additional external Load during the Eccentric phase of lower limb strength training exercises led to greater adaptations in knee extensor strength, muscle architecture, and patellar tendon properties than traditional concentric–Eccentric training in already-trained men. Methods Twenty-eight men accustomed to strength training were randomized to undertake 10 weeks of supervised traditional (TRAD) or accentuated Eccentric Loading (AEL) or continue their habitual unsupervised (CON) strength training. TRAD and AEL trained 2∙week^−1 with a six-repetition maximum (RM) session and a ten-RM session. TRAD used the same external Load in both concentric and Eccentric phases, while AEL used 40% greater Load during the Eccentric than concentric phase. Tests were performed at pre- and post-training, including: maximum unilateral isokinetic (30°·s^−1) concentric, Eccentric and isometric torques by isokinetic dynamometry, unilateral isometric ramp contractions with muscle–tendon ultrasound imaging to measure tendon stiffness and hysteresis, and resting vastus lateralis and medialis fascicle angle and length measured by extended-field-of-view ultrasound. Results After training, both TRAD and AEL significantly increased maximum concentric and isometric torque ( p
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increased fascicle length but not patellar tendon stiffness after accentuated Eccentric Load strength training in already trained men
European Journal of Applied Physiology, 2020Co-Authors: Simon Walker, Robert U Newton, Joanne Trezise, Guy Gregory Haff, Keijo Häkkinen, Anthony J. BlazevichAbstract:This study examined whether additional external Load during the Eccentric phase of lower limb strength training exercises led to greater adaptations in knee extensor strength, muscle architecture, and patellar tendon properties than traditional concentric–Eccentric training in already-trained men. Twenty-eight men accustomed to strength training were randomized to undertake 10 weeks of supervised traditional (TRAD) or accentuated Eccentric Loading (AEL) or continue their habitual unsupervised (CON) strength training. TRAD and AEL trained 2∙week−1 with a six-repetition maximum (RM) session and a ten-RM session. TRAD used the same external Load in both concentric and Eccentric phases, while AEL used 40% greater Load during the Eccentric than concentric phase. Tests were performed at pre- and post-training, including: maximum unilateral isokinetic (30°·s−1) concentric, Eccentric and isometric torques by isokinetic dynamometry, unilateral isometric ramp contractions with muscle–tendon ultrasound imaging to measure tendon stiffness and hysteresis, and resting vastus lateralis and medialis fascicle angle and length measured by extended-field-of-view ultrasound. After training, both TRAD and AEL significantly increased maximum concentric and isometric torque (p < 0.05), but only AEL increased Eccentric torque (AEL: + 10 ± 9%, TRAD: + 4 ± 9%) and vastus lateralis (AEL: + 14 ± 14%, TRAD: + 1 ± 10%) and medialis (AEL: + 19 ± 8%, TRAD: + 5 ± 11%) fascicle length. Both TRAD and AEL increased maximum knee extensor strength but only AEL increased VL and VM fascicle length. Neither training program promoted changes in fascicle angle or changes in patellar tendon properties in our already-trained men.
Abdul Aziz Abdul Samad - One of the best experts on this subject based on the ideXlab platform.
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structural behaviour of precast lightweight foamed concrete sandwich panel plfp with double shear truss connectors under Eccentric Load preliminary result
Advanced Materials Research, 2013Co-Authors: Ismail Ahmad, Wan Inn Goh, Suriyani Samsuddin, Noridah Mohamad, M H A Rahman, Abdul Aziz Abdul SamadAbstract:Recent years in Malaysia, precast concrete sandwich panel gained its popularity in building industries due to its economic advantages, superior thermal and structural efficiency. This paper studied the structural behaviour of precast lightweight foamed concrete sandwich panel (PLFP) with double shear truss connectors under Eccentric Load. Preliminary results were analysed and studied to obtain the ultimate Load carrying capacity, Load-deflection profiles and strain distribution across the panel thickness at mid depth. The achieved ultimate Load carrying capacity of PLFP due to Eccentric Load from the experimental work was compared with values calculated from classical formulas (if it is more than 1 comparison) developed by previous researchers. Preliminary results showed that, the use of double shear truss connectors in PLFP was able to improve its ultimate Load carrying capacity to sustain Eccentric Load and achieve certain compositeness reaction in between the wythes.
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structural behaviour of Eccentrically Loaded precast sandwich panels
Construction and Building Materials, 2006Co-Authors: A Benayoune, Abdul Aziz Abdul Samad, D N Trikha, Abdullah Abang A Ali, A A AshrabovAbstract:Abstract Results of an experimental investigation to study the ultimate strength behaviour of precast concrete sandwich panels (PCSP) with steel truss shear connectors are reported. Six full-scale sandwich panels with variable slenderness ratio were cast and tested under Eccentric Loads. Deflection characteristics, variations of strains across the insulation layer, strains in shear connectors, crack appearance and propagation under increasing Load were recorded and analysed. The role of the shear truss connectors in transferring Load from the outer wythe (layer) to the inner and ensuring composite behaviour was also observed. Results obtained showed that all panels behaved in a fully composite manner under Eccentric Load till failure. The ultimate strength of the PCSPs was found to decrease non-linearly with the increase in the slenderness ratio. Because of the complex behaviour of PCSP due to its material non-linearity and the interaction between its various components, finite element analysis (FEA) was conducted. Comparison with test results indicated that the FEA closely estimate the wall strength and formulae based on reinforced concrete principles underestimate the wall strength.
Keijo Häkkinen - One of the best experts on this subject based on the ideXlab platform.
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Increased fascicle length but not patellar tendon stiffness after accentuated Eccentric-Load strength training in already-trained men
European Journal of Applied Physiology, 2020Co-Authors: Simon Walker, Robert U Newton, Joanne Trezise, Guy Gregory Haff, Keijo Häkkinen, Anthony J. BlazevichAbstract:Purpose This study examined whether additional external Load during the Eccentric phase of lower limb strength training exercises led to greater adaptations in knee extensor strength, muscle architecture, and patellar tendon properties than traditional concentric–Eccentric training in already-trained men. Methods Twenty-eight men accustomed to strength training were randomized to undertake 10 weeks of supervised traditional (TRAD) or accentuated Eccentric Loading (AEL) or continue their habitual unsupervised (CON) strength training. TRAD and AEL trained 2∙week^−1 with a six-repetition maximum (RM) session and a ten-RM session. TRAD used the same external Load in both concentric and Eccentric phases, while AEL used 40% greater Load during the Eccentric than concentric phase. Tests were performed at pre- and post-training, including: maximum unilateral isokinetic (30°·s^−1) concentric, Eccentric and isometric torques by isokinetic dynamometry, unilateral isometric ramp contractions with muscle–tendon ultrasound imaging to measure tendon stiffness and hysteresis, and resting vastus lateralis and medialis fascicle angle and length measured by extended-field-of-view ultrasound. Results After training, both TRAD and AEL significantly increased maximum concentric and isometric torque ( p
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increased fascicle length but not patellar tendon stiffness after accentuated Eccentric Load strength training in already trained men
European Journal of Applied Physiology, 2020Co-Authors: Simon Walker, Robert U Newton, Joanne Trezise, Guy Gregory Haff, Keijo Häkkinen, Anthony J. BlazevichAbstract:This study examined whether additional external Load during the Eccentric phase of lower limb strength training exercises led to greater adaptations in knee extensor strength, muscle architecture, and patellar tendon properties than traditional concentric–Eccentric training in already-trained men. Twenty-eight men accustomed to strength training were randomized to undertake 10 weeks of supervised traditional (TRAD) or accentuated Eccentric Loading (AEL) or continue their habitual unsupervised (CON) strength training. TRAD and AEL trained 2∙week−1 with a six-repetition maximum (RM) session and a ten-RM session. TRAD used the same external Load in both concentric and Eccentric phases, while AEL used 40% greater Load during the Eccentric than concentric phase. Tests were performed at pre- and post-training, including: maximum unilateral isokinetic (30°·s−1) concentric, Eccentric and isometric torques by isokinetic dynamometry, unilateral isometric ramp contractions with muscle–tendon ultrasound imaging to measure tendon stiffness and hysteresis, and resting vastus lateralis and medialis fascicle angle and length measured by extended-field-of-view ultrasound. After training, both TRAD and AEL significantly increased maximum concentric and isometric torque (p < 0.05), but only AEL increased Eccentric torque (AEL: + 10 ± 9%, TRAD: + 4 ± 9%) and vastus lateralis (AEL: + 14 ± 14%, TRAD: + 1 ± 10%) and medialis (AEL: + 19 ± 8%, TRAD: + 5 ± 11%) fascicle length. Both TRAD and AEL increased maximum knee extensor strength but only AEL increased VL and VM fascicle length. Neither training program promoted changes in fascicle angle or changes in patellar tendon properties in our already-trained men.
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effects of different accentuated Eccentric Load levels in Eccentric concentric actions on acute neuromuscular maximal force and power responses
Journal of Strength and Conditioning Research, 2009Co-Authors: Timo Ojasto, Keijo HäkkinenAbstract:This study examined the effects of different dynamic accentuated external resistance Load levels during the Eccentric(ECC) phase of ECC-concentric (CON) actions on acute neuromuscular, maximal force, and power responses in the bench press exercise in male subjects (age, = 32 +/- 4 years; n = 11). Four maximum strength sessions consisted of 1 repetition maximum (RM) lifts with traditional isoinertial resistances and of 1RM lifts with the different dynamic accentuated external resistance (DAER) Loads of 100, 105, 110, and 120% of 1 RM for the ECC phase, whereas 100% of 1RM was constantly used for the CON phase. One explosive strength session consisted of explosive repetitions with the 50, 60, 70, 80, and 90% of 1RM Loads for the ECC phase, whereas 50% of 1RM was constantly used for the CON phase. Force, power, and electromyography (EMG) activation of agonist deltoid, pectoralis major, triceps brachii, and antagonist biceps brachii muscles were recorded. In all maximum strength DAER sessions (105/100%, 110/100%, and 120/100%), CON 1RM and CON force reduced (p < 0.05) compared with the control condition (100/100%). ECC muscle activity did not differ in the DAER Loading conditions compared with the control Loading condition. In the explosive strength session, peak power increased significantly from the 50/50% condition compared to the condition of 77.3 +/- 3.2/50% (p < 0.001) that produced the highest power for each individual. ECC agonist EMG activity increased significantly from the 50% condition to that of the 77.3 +/- 3.2/50% condition (p < 0.05). The present data showed that the different Loads used in the DAER bench press action did not enhance maximum concentric strength production, but concentric power output during explosive actions with the individualized optimal Load was larger compared with the control condition.
Guy Gregory Haff - One of the best experts on this subject based on the ideXlab platform.
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Increased fascicle length but not patellar tendon stiffness after accentuated Eccentric-Load strength training in already-trained men
European Journal of Applied Physiology, 2020Co-Authors: Simon Walker, Robert U Newton, Joanne Trezise, Guy Gregory Haff, Keijo Häkkinen, Anthony J. BlazevichAbstract:Purpose This study examined whether additional external Load during the Eccentric phase of lower limb strength training exercises led to greater adaptations in knee extensor strength, muscle architecture, and patellar tendon properties than traditional concentric–Eccentric training in already-trained men. Methods Twenty-eight men accustomed to strength training were randomized to undertake 10 weeks of supervised traditional (TRAD) or accentuated Eccentric Loading (AEL) or continue their habitual unsupervised (CON) strength training. TRAD and AEL trained 2∙week^−1 with a six-repetition maximum (RM) session and a ten-RM session. TRAD used the same external Load in both concentric and Eccentric phases, while AEL used 40% greater Load during the Eccentric than concentric phase. Tests were performed at pre- and post-training, including: maximum unilateral isokinetic (30°·s^−1) concentric, Eccentric and isometric torques by isokinetic dynamometry, unilateral isometric ramp contractions with muscle–tendon ultrasound imaging to measure tendon stiffness and hysteresis, and resting vastus lateralis and medialis fascicle angle and length measured by extended-field-of-view ultrasound. Results After training, both TRAD and AEL significantly increased maximum concentric and isometric torque ( p
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increased fascicle length but not patellar tendon stiffness after accentuated Eccentric Load strength training in already trained men
European Journal of Applied Physiology, 2020Co-Authors: Simon Walker, Robert U Newton, Joanne Trezise, Guy Gregory Haff, Keijo Häkkinen, Anthony J. BlazevichAbstract:This study examined whether additional external Load during the Eccentric phase of lower limb strength training exercises led to greater adaptations in knee extensor strength, muscle architecture, and patellar tendon properties than traditional concentric–Eccentric training in already-trained men. Twenty-eight men accustomed to strength training were randomized to undertake 10 weeks of supervised traditional (TRAD) or accentuated Eccentric Loading (AEL) or continue their habitual unsupervised (CON) strength training. TRAD and AEL trained 2∙week−1 with a six-repetition maximum (RM) session and a ten-RM session. TRAD used the same external Load in both concentric and Eccentric phases, while AEL used 40% greater Load during the Eccentric than concentric phase. Tests were performed at pre- and post-training, including: maximum unilateral isokinetic (30°·s−1) concentric, Eccentric and isometric torques by isokinetic dynamometry, unilateral isometric ramp contractions with muscle–tendon ultrasound imaging to measure tendon stiffness and hysteresis, and resting vastus lateralis and medialis fascicle angle and length measured by extended-field-of-view ultrasound. After training, both TRAD and AEL significantly increased maximum concentric and isometric torque (p < 0.05), but only AEL increased Eccentric torque (AEL: + 10 ± 9%, TRAD: + 4 ± 9%) and vastus lateralis (AEL: + 14 ± 14%, TRAD: + 1 ± 10%) and medialis (AEL: + 19 ± 8%, TRAD: + 5 ± 11%) fascicle length. Both TRAD and AEL increased maximum knee extensor strength but only AEL increased VL and VM fascicle length. Neither training program promoted changes in fascicle angle or changes in patellar tendon properties in our already-trained men.
Joanne Trezise - One of the best experts on this subject based on the ideXlab platform.
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Increased fascicle length but not patellar tendon stiffness after accentuated Eccentric-Load strength training in already-trained men
European Journal of Applied Physiology, 2020Co-Authors: Simon Walker, Robert U Newton, Joanne Trezise, Guy Gregory Haff, Keijo Häkkinen, Anthony J. BlazevichAbstract:Purpose This study examined whether additional external Load during the Eccentric phase of lower limb strength training exercises led to greater adaptations in knee extensor strength, muscle architecture, and patellar tendon properties than traditional concentric–Eccentric training in already-trained men. Methods Twenty-eight men accustomed to strength training were randomized to undertake 10 weeks of supervised traditional (TRAD) or accentuated Eccentric Loading (AEL) or continue their habitual unsupervised (CON) strength training. TRAD and AEL trained 2∙week^−1 with a six-repetition maximum (RM) session and a ten-RM session. TRAD used the same external Load in both concentric and Eccentric phases, while AEL used 40% greater Load during the Eccentric than concentric phase. Tests were performed at pre- and post-training, including: maximum unilateral isokinetic (30°·s^−1) concentric, Eccentric and isometric torques by isokinetic dynamometry, unilateral isometric ramp contractions with muscle–tendon ultrasound imaging to measure tendon stiffness and hysteresis, and resting vastus lateralis and medialis fascicle angle and length measured by extended-field-of-view ultrasound. Results After training, both TRAD and AEL significantly increased maximum concentric and isometric torque ( p
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increased fascicle length but not patellar tendon stiffness after accentuated Eccentric Load strength training in already trained men
European Journal of Applied Physiology, 2020Co-Authors: Simon Walker, Robert U Newton, Joanne Trezise, Guy Gregory Haff, Keijo Häkkinen, Anthony J. BlazevichAbstract:This study examined whether additional external Load during the Eccentric phase of lower limb strength training exercises led to greater adaptations in knee extensor strength, muscle architecture, and patellar tendon properties than traditional concentric–Eccentric training in already-trained men. Twenty-eight men accustomed to strength training were randomized to undertake 10 weeks of supervised traditional (TRAD) or accentuated Eccentric Loading (AEL) or continue their habitual unsupervised (CON) strength training. TRAD and AEL trained 2∙week−1 with a six-repetition maximum (RM) session and a ten-RM session. TRAD used the same external Load in both concentric and Eccentric phases, while AEL used 40% greater Load during the Eccentric than concentric phase. Tests were performed at pre- and post-training, including: maximum unilateral isokinetic (30°·s−1) concentric, Eccentric and isometric torques by isokinetic dynamometry, unilateral isometric ramp contractions with muscle–tendon ultrasound imaging to measure tendon stiffness and hysteresis, and resting vastus lateralis and medialis fascicle angle and length measured by extended-field-of-view ultrasound. After training, both TRAD and AEL significantly increased maximum concentric and isometric torque (p < 0.05), but only AEL increased Eccentric torque (AEL: + 10 ± 9%, TRAD: + 4 ± 9%) and vastus lateralis (AEL: + 14 ± 14%, TRAD: + 1 ± 10%) and medialis (AEL: + 19 ± 8%, TRAD: + 5 ± 11%) fascicle length. Both TRAD and AEL increased maximum knee extensor strength but only AEL increased VL and VM fascicle length. Neither training program promoted changes in fascicle angle or changes in patellar tendon properties in our already-trained men.