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Articles 691 - 720 of 777
Full-Text Articles in Sports Sciences
Two Maximal Isometric Contractions Attenuate The Magnitude Of Eccentric Exercise-Induced Muscle Damage, Hsin-Lian Chen, Kazunori Nosaka, Alan Pearce, Trevor C Chen
Two Maximal Isometric Contractions Attenuate The Magnitude Of Eccentric Exercise-Induced Muscle Damage, Hsin-Lian Chen, Kazunori Nosaka, Alan Pearce, Trevor C Chen
Research outputs 2012
This study investigated whether maximal voluntary isometric contractions (MVC-ISO) would attenuate the magnitude of eccentric exercise-induced muscle damage. Young untrained men were placed into one of the two experimental groups or one control group (n = 13 per group). Subjects in the experimental groups performed either two or 10 MVC-ISO of the elbow flexors at a long muscle length (20° flexion) 2 days prior to 30 maximal isokinetic eccentric contractions of the elbow flexors. Subjects in the control group performed the eccentric contractions without MVC-ISO. No significant changes in maximal voluntary concentric contraction peak torque, peak torque angle, range of …
Lower Extremity Kinematics And Kinetics When Landing From Unloaded And Loaded Jumps, Ina Janssen, Jeremy Sheppard, Andrew Dingley, Dale Chapman, Wayne Spratford
Lower Extremity Kinematics And Kinetics When Landing From Unloaded And Loaded Jumps, Ina Janssen, Jeremy Sheppard, Andrew Dingley, Dale Chapman, Wayne Spratford
Research outputs 2012
Countermovement jumps loaded with a weighted vest are often used for the training of lower body power to improve jump performance. However, it is currently unknown how this added load affects the lower extremity kinematics and kinetics, in particular whether this results in an increased injury risk. Therefore, the purpose of this investigation was to determine how lower extremity kinematics and kinetics during landing are affected by loaded jumps as demonstrated in a volleyball block jump landing. Ten elite male volleyball players performed block jump landings in an unloaded and loaded (9.89 kg) condition. Kinematic and kinetic landing data from …
Changes In Upper Body Concentric Mean Power Output Resulting From Complex Training Emphasizing Concentric Muscle Actions, Daniel Baker
Changes In Upper Body Concentric Mean Power Output Resulting From Complex Training Emphasizing Concentric Muscle Actions, Daniel Baker
Research outputs 2012
Contrasting resistance complex (CRC) training is the alternating of sets of heavier and lighter resistances in an effort to evoke an acute increase in power output while lifting the lighter resistance. The effectiveness of CRC has been well established in elite athletes when researchers utilize an optimal manipulation of training variables but equivocal for other studies that have used a very heavy resistance to “stimulate” the neuro-muscular system. It was theorized that very heavy resistances could conceivably fatigue the processes associated with the stretch-shorten cycle (SSC). The purpose of this study was to determine the effects of CRC when utilizing …
Anthropometric Characteristics, Upper-Body Strength, And Sprint Paddling Performance In Competitive Surfers, Jeremy Sheppard, Mark Osborne, Dale Chapman, Mark Andrews
Anthropometric Characteristics, Upper-Body Strength, And Sprint Paddling Performance In Competitive Surfers, Jeremy Sheppard, Mark Osborne, Dale Chapman, Mark Andrews
Research outputs 2012
The present study examined the potential differences in anthropometric characteristics, upper-body strength, and sprint paddling performance between youth and senior competitive surfers. Twenty competitive male surfers (19.1±6.8 years, 168.2±11.3 cm, 61.7±13.6 kg) were assessed for stature, mass, arm-span, ∑ 7 site skinfold thickness, Lean-Mass Ratio (LMR, ∑ 7 site skinfold/kg body-mass), pronated pull-up 1 repetition maximum (1 RM) and sprint paddling performance from a stationary start to 15 m. Independent t-tests were used to compare potential differences between youth (n:10) and senior group (n:10) of competitive surfers, with Cohen’s Effect Size (d) applied to reflect the magnitude of any differences …
Acute Effects Of Three Different Stretching Protocols On The Wingate Test Performance, B L Franco, G R Signorelli, Gabriel Trajano, P B Costa, C G De Oliveira
Acute Effects Of Three Different Stretching Protocols On The Wingate Test Performance, B L Franco, G R Signorelli, Gabriel Trajano, P B Costa, C G De Oliveira
Research outputs 2012
The purpose of this study was to examine the acute effects of different stretching exercises on the performance of the traditional Wingate test (WT). Fifteen male participants performed five WT; one for familiarization (FT), and the remaining four after no stretching (NS), static stretching (SS), dynamic stretching (DS), and proprioceptive neuromuscular facilitation (PNF). Stretches were targeted for the hamstrings, quadriceps, and calf muscles. Peak power (PP), mean power (MP), and the time to reach PP (TP) were calculated. The MP was significantly lower when comparing the DS (7.7 ± 0.9 W/kg) to the PNF (7.3 ± 0.9 W/kg) condition (p < 0.05). For PP, significant differences were observed between more comparisons, with PNF stretching providing the lowest result. A consistent increase of TP was observed after all stretching exercises when compared to NS. The results suggest the type of stretching, or no stretching, should be considered by those who seek higher performance and practice sports that use maximal anaerobic power.
Practicing Field Hockey Skills Along The Contextual Interference Continuum: A Comparison Of Five Practice Schedules, Jadeera Cheong, Brendan Lay, J. Robert Grove, Nikola Medic, Rizal Razman
Practicing Field Hockey Skills Along The Contextual Interference Continuum: A Comparison Of Five Practice Schedules, Jadeera Cheong, Brendan Lay, J. Robert Grove, Nikola Medic, Rizal Razman
Research outputs 2012
To overcome the weakness of the contextual interference (CI) effect within applied settings, Brady (2008) recommended that the amount of interference be manipulated. This study investigated the effect of five practice schedules on the learning of three field hockey skills. Fifty-five pre-university students performed a total of 90 trials for each skill under blocked, mixed or random practice orders. Results showed a significant time effect with all five practice conditions leading to improvements in acquisition and learning of the skills. No significant differences were found between the groups. The findings of the present study did not support the CI effect …
The Effects Of The Deflection Point And Shaft Mass On Swing And Launch Parameters In The Golf Swing, Christopher Joyce, Angus Burnett, Stephen Herbert
The Effects Of The Deflection Point And Shaft Mass On Swing And Launch Parameters In The Golf Swing, Christopher Joyce, Angus Burnett, Stephen Herbert
Research outputs 2012
This study determined whether a higher dynamic deflection point (DDP) was evident when using a driver fitted with a stiff shaft of greater mass and whether between-shaft differences were evident in swing and launch parameters. Twelve elite male golfers had three shots analysed for each of two drivers fitted with “stiff” shafts of different mass (56 g and 78 g). Six swing and launch parameters were measured by a real-time launch monitor and the (DDP) was measured using a motion analysis system. Between-shaft differences were evident for the DDP at maximum, but not at ball impact. Between-shaft differences in swing …
Swing And Launch Parameters In Approach-Iron Shots Hit With Varying Height And Trajectory In Golf, Samuel J. Robertson, Angus Burnett
Swing And Launch Parameters In Approach-Iron Shots Hit With Varying Height And Trajectory In Golf, Samuel J. Robertson, Angus Burnett
Research outputs 2012
The first aim of this study was to determine whether relationships existed between variability of swing and launch parameters and variability in shot outcome for straight golf shots. The second aim was to determine whether differences existed for swing and launch parameters in shots intentionally played with varying height and trajectory. Elite (n=20) and high-level amateur (n=22) golfers hit; 1) five straight shots of normal height and 2) nine shots of differing height (low, normal, high) and trajectory (straight, draw, fade). Variability of club attack angle, face angle and ball spin axis was significantly associated (p
Effects Of Lowering Body Temperature Via Hyperhydration, With And Without Glycerol Ingestion And Practical Precooling On Cycling Time Trial Performance In Hot And Humid Conditions, Megan Ross, Nikki Jeacocke, Paul Laursen, David Martin, Christopher Abbiss, Louise Burke
Effects Of Lowering Body Temperature Via Hyperhydration, With And Without Glycerol Ingestion And Practical Precooling On Cycling Time Trial Performance In Hot And Humid Conditions, Megan Ross, Nikki Jeacocke, Paul Laursen, David Martin, Christopher Abbiss, Louise Burke
Research outputs 2012
Background: Hypohydration and hyperthermia are factors that may contribute to fatigue and impairment of endurance performance. The purpose of this study was to investigate the effectiveness of combining glycerol hyperhydration and an established precooling technique on cycling time trial performance in hot environmental conditions.Methods: Twelve well-trained male cyclists performed three 46.4-km laboratory-based cycling trials that included two climbs, under hot and humid environmental conditions (33.3 ± 1.1°C; 50 ± 6% r.h.). Subjects were required to hyperhydrate with 25 g.kg-1 body mass (BM) of a 4°C beverage containing 6% carbohydrate (CON) 2.5 h prior to the time trial. On two occasions, …
Reliability And Validity Of Unilateral And Bilateral Isometric Strength Measures Using A Customised, Portable Apparatus, Nicolas Hart, Sophia Nimphius, Jodie Wilkie, Robert Newton
Reliability And Validity Of Unilateral And Bilateral Isometric Strength Measures Using A Customised, Portable Apparatus, Nicolas Hart, Sophia Nimphius, Jodie Wilkie, Robert Newton
Research outputs 2012
No abstract provided.
Monitoring Neuromuscular Fatigue In High Performance Athletes, Kristie-Lee Taylor
Monitoring Neuromuscular Fatigue In High Performance Athletes, Kristie-Lee Taylor
Theses: Doctorates and Masters
With improving professionalism of sports around the world, the volume and frequency of training required for competitive performances at the elite level has increased concurrently. With this amplification in training load comes an increased need to closely monitor the associated fatigue responses, since maximising the adaptive response to training is also reliant on avoiding the negative consequences of excessive fatigue. The rationale for the experimental chapters in this thesis was established after considering survey responses regarding current best practice for monitoring fatigue in high performance sporting environments (Chapter 3). On the basis of the results, vertical jump assessments were selected …
Assessment And Training Of Muscular Force And Power Qualities Of The Lower Limb Using Traditional And Cluster Loading, Keir Hansen
Assessment And Training Of Muscular Force And Power Qualities Of The Lower Limb Using Traditional And Cluster Loading, Keir Hansen
Theses: Doctorates and Masters
It is widely accepted that lower body muscular force and power capabilities are of significant importance to many athletic tasks. Thus the assessment and training of these qualities are a key focus in both sports science and strength and conditioning practice. The purpose of this thesis was firstly to investigate previously discussed but poorly researched methods of assessing force and power characteristics of the lower limb particularly focusing on the analysis of the force-time and power-time curves during the rebound jump squat, and secondly, to investigate the effectiveness of cluster loading, an alternative resistance training paradigm, in training for lower …
Practical Precooling Strategies And Cycling Time Trial Performance, Megan L. Ross
Practical Precooling Strategies And Cycling Time Trial Performance, Megan L. Ross
Theses: Doctorates and Masters
Whole-body precooling can improve endurance exercise performance, especially in the heat; however there are logistical considerations that restrict the use of various precooling strategies prior to actual competition. Precooling is proposed to collectively reduce deep skin and body temperature and in effect, increase the heat storage capacity of an athlete, thereby allowing a greater amount of work to be completed prior to attainment of a critical core temperature. While there is a sound theoretical basis for implementing precooling to improve cycling time trial performance in the heat, the practicalities of employing effective precooling strategies in the field warrant further investigation. …
Thermoregulatory And Exercise Performance : Responses To Cooling With Ice Slurry Ingestion, Rodney Siegel
Thermoregulatory And Exercise Performance : Responses To Cooling With Ice Slurry Ingestion, Rodney Siegel
Theses: Doctorates and Masters
The rise in body core, skin and muscle temperatures associated with exercise
in hot environments (~30°C and above) is known to impair performance over a
variety of exercise modes and durations. Precooling has become a popular strategy to
combat this impairment, as evidence has shown it to be an effective method for
lowering pre-exercise core temperature, increasing heat storage capacity and
improving exercise performance in the heat. To date, the majority of precooling
manoeuvres are achieved via external means, such as cold water immersion and the
application of cooling garments; methods which have been criticised for their lack of
practicality …
The Influence Of Set-Repetition Configuration In Eccentric Exercise On Muscle Damage And Repeated Bout Effect, Roy Y.H. Chan
The Influence Of Set-Repetition Configuration In Eccentric Exercise On Muscle Damage And Repeated Bout Effect, Roy Y.H. Chan
Theses: Doctorates and Masters
It is well known that maximal eccentric exercise induces muscle damage, especially when it is performed for the first time. However, muscle damage is attenuated in subsequent bouts of the same or similar exercise, which is known as the repeated bout effect. One of the factors affecting the magnitude of muscle damage and the repeated bout effect is the number of eccentric contractions; however, it is unknown if different set-repetition configurations with the same number of eccentric contractions would result in different magnitudes of muscle damage and adaptation. This study investigated changes in muscle strength, range of motion (ROM), muscle …
Exercise As Medicine For Cancer, Robert Newton, Daniel Galvao, Prue Cormie, Michael Baker, Carolyn Mcintyre
Exercise As Medicine For Cancer, Robert Newton, Daniel Galvao, Prue Cormie, Michael Baker, Carolyn Mcintyre
ECU Research Week
No abstract provided.
Efficacy And Safety Of A Modular Multi-Modal Exercise Program In Prostate Cancer Patients With Bone Metastases: A Randomized Controlled Trial, Daniel Galvao, Dennis R. Taaffe, Prue Cormie, Nigel Spry, Susan K. Chambers, Carolyn Peddle-Mcintyre, Michael Baker, James Denham, David Joseph, Geoff Groom, Robert Newton
Efficacy And Safety Of A Modular Multi-Modal Exercise Program In Prostate Cancer Patients With Bone Metastases: A Randomized Controlled Trial, Daniel Galvao, Dennis R. Taaffe, Prue Cormie, Nigel Spry, Susan K. Chambers, Carolyn Peddle-Mcintyre, Michael Baker, James Denham, David Joseph, Geoff Groom, Robert Newton
Research outputs 2011
Background: The presence of bone metastases has excluded participation of prostate cancer patients in exercise intervention studies to date and is also a relative contraindication to supervised exercise in the community setting because of concerns of fragility fracture. However, this group of patients often have developed significant muscle atrophy and functional impairments from prior and continuing androgen deprivation that is exacerbated by subsequent and more intensive interventions such as chemotherapy. The aim of this study is to determine the efficacy and safety of a modular multi-modal exercise program in prostate cancer patients with bone metastases. Methods/Design: Multi-site randomized controlled trial …
The Effect Of Cluster Loading On Force, Velocity, And Power During Ballistic Jump Squat Training, Keir Hansen, John Cronin, Michael Newton
The Effect Of Cluster Loading On Force, Velocity, And Power During Ballistic Jump Squat Training, Keir Hansen, John Cronin, Michael Newton
Research outputs 2011
Purpose: The purpose of this study was to investigate the effect of set structure, in terms of repetition work:rest ratios on force, velocity, and power during jump squat training. Methods: Twenty professional and semiprofessional rugby players performed training sessions comprising four sets of 6 repetitions of a jump squat using four different set configurations. The first involved a traditional configuration (TR) of 4 × 6 repetitions with 3 min of rest between sets, the second (C1) 4 × 6 × singles (1 repetition) with 12 s of rest between repetitions, the third (C2) 4 × 3 × doubles (2 repetitions) …
Long-Term Training Adaptations In Elite Male Volleyball Players, Jeremy Sheppard, Robert Newton
Long-Term Training Adaptations In Elite Male Volleyball Players, Jeremy Sheppard, Robert Newton
Research outputs 2011
Abstract: Sheppard, JM, and Newton, RU. Long-term training adaptations in elite male volleyball players. J Strength Cond Res 26(8): 2180–2184, 2012—Several investigations have demonstrated differences in anthropometry, jump performance, and strength variables between developmental and elite-level volleyball players. However, within the elite level of play, the magnitude of change that can occur with training is unclear. The purpose of this investigation was to examine the anthropometric, vertical jump, and strength quality changes over 2 years in a group of national team volleyball players. Fourteen national team volleyball players (age, 23.0 ± 4.1 years; height, 1.98 ± 0.07 m; weight, 91.7 …
Circadian Rhythms In Exercise Performance: Implications For Hormonal And Muscular Adaptation, Weipeng Teo, Michael Newton, Michael Mcguigan
Circadian Rhythms In Exercise Performance: Implications For Hormonal And Muscular Adaptation, Weipeng Teo, Michael Newton, Michael Mcguigan
Research outputs 2011
Almost all physiological and biochemical processes within the human body follow a circadian rhythm (CR). In humans, the suprachiasmatic nucleus regulates sleep-wake cycle and other daily biorhythms in line with solar time. Due to such daily physiological fluctuations, several investigations on neuromuscular performance have reported a distinct CR during exercise. Generally, peak performances have been found to occur in the early evening, at approximately the peak of core body temperature. The increase in core body temperature has been found to increase energy metabolism, improve muscle compliance and facilitate actin-myosin crossbridging. In addition, steroidal hormones such as testosterone (T) and cortisol …
Relationships Between Triathlon Performance And Pacing Strategy During The Run In An International Competition, Yann Le Meur, Tierry Bernard, Sylvain Dorel, Chris Abbiss, Gerard Honnorat, Jeanick Brisswalter, Christophe Hausswirth
Relationships Between Triathlon Performance And Pacing Strategy During The Run In An International Competition, Yann Le Meur, Tierry Bernard, Sylvain Dorel, Chris Abbiss, Gerard Honnorat, Jeanick Brisswalter, Christophe Hausswirth
Research outputs 2011
PURPOSE: The purpose of the present study was to examine relationships between athlete's pacing strategies and running performance during an international triathlon competition. METHODS: Running split times for each of the 107 finishers of the 2009 European Triathlon Championships (42 females and 65 males) were determined with the use of a digital synchronized video analysis system. Five cameras were placed at various positions of the running circuit (4 laps of 2.42 km). Running speed and an index of running speed variability (IRSVrace) were subsequently calculated over each section or running split. RESULTS: Mean running speed over the first 1272 m …
Influence Of Environmental Temperature On 40 Km Cycling Time-Trial Performance, Jeremiah J. Peiffer, Chris R. Abbiss
Influence Of Environmental Temperature On 40 Km Cycling Time-Trial Performance, Jeremiah J. Peiffer, Chris R. Abbiss
Research outputs 2011
The purpose of this study was to examine the effect of environmental temperature on variability in power output, self-selected pacing strategies, and performance during a prolonged cycling time trial. Nine trained male cyclists randomly completed four 40 km cycling time trials in an environmental chamber at 17°C, 22°C, 27°C, and 32°C (40% RH). During the time trials, heart rate, core body temperature, and power output were recorded. The variability in power output was assessed with the use of exposure variation analysis. Mean 40 km power output was significantly lower during 32°C (309 ± 35 W) compared with 17°C (329 ± …
Effect Of Transcranial Direct Current Stimulation (Tdcs) On Maximal Voluntary Isometric Strength And Endurance Of The Elbow Flexors, Benjamin Kan
Theses: Doctorates and Masters
The present study investigated the effects of transcranial direct current stimulation (tDCS) on maximal voluntary contraction strength (MVC) and the time to failure (TTF) of an isometric muscle endurance test of the elbow flexors. Prior to the main study, the test-retest reliability of MVC and TTF measures was investigated using 10 men (33.2 ± 9.4 y) for the measurements separated by 60 min (within-day) and one week (between-day). Coefficient of variation (CV), Intraclass correlation (ICC, R), a paired t-test and the Bland-Altman plots revealed that TTF at 30% MVC task was reliable, and was able to detect a possible effect …
Feedback Control For Exergames, Jeff Sinclair
Feedback Control For Exergames, Jeff Sinclair
Theses: Doctorates and Masters
The concept of merging exercise equipment with video games, known as exergaming, has the potential to be one of the main tools used in addressing the current rising obesity epidemic. Existing research shows that exergaming can help improve fitness and additionally motivate people to become more active. The two key elements of attractiveness - how much people want to play or use the exergaming system; and effectiveness – how effective the exergaming system is in actually increasing or maintaining physical fitness, need to be maximised to obtain the best outcomes from an exergaming system; we put this forward as the …
Comparison Of Acute Physiological Effects Between Alternating Current And Pulsed Current Electrical Muscle Stimulation, Abdulaziz A. Aldayel
Comparison Of Acute Physiological Effects Between Alternating Current And Pulsed Current Electrical Muscle Stimulation, Abdulaziz A. Aldayel
Theses: Doctorates and Masters
Electrical muscle stimulation (EMS) is widely used in rehabilitation and sport training, and alternating current and pulsed current EMS are commonly used. However, no systematic comparison between alternating and pulsed current EMS has been made in the previous studies. The main aim of this research was to compare acute physiological responses between the alternating and pulsed current EMS. The secondary purpose of the research was to investigate further muscle damage induced by EMS-evoked isometric contractions. Three experimental studies were conducted in the thesis project together with literature review about EMS.
Examining Pacing Profiles In Elite Female Road Cyclists Using Exposure Variation Analysis, Chris Abbiss, Leon Straker, Marc Quod, David Martin, Paul Laursen
Examining Pacing Profiles In Elite Female Road Cyclists Using Exposure Variation Analysis, Chris Abbiss, Leon Straker, Marc Quod, David Martin, Paul Laursen
Research outputs pre 2011
Objective In this study, the amplitude and time distribution of power output in a variety of competitive cycling events through the use of a new mathematical analysis was examined: exposure variation analysis (EVA). Design Descriptive field study. Setting Various professional road cycling events, including; a 5-day—eight-stage tour race, a 1-day World Cup event and the Australian National Individual Time Trial Championships. Participants 9 elite female cyclists (mean (SD), mass = 57.8 (3.4) kg, height = 167.3 (2.8) cm, Vo2peak = 63.2 (5.2) ml kg−1 min−1). Interventions None. Main outcome measurements The variation in power output and the quantification of the …
Sources Of Variability In Iso-Inertial Jump Assessments, Kristie-Lee Taylor, John Cronin, Nicholas Gill, Dale Chapman, Jeremy Sheppard
Sources Of Variability In Iso-Inertial Jump Assessments, Kristie-Lee Taylor, John Cronin, Nicholas Gill, Dale Chapman, Jeremy Sheppard
Research outputs pre 2011
Purpose: This investigation aimed to quantify the typical variation for kinetic and kinematic variables measured during loaded jump squats. Methods: Thirteen professional athletes performed six maximal effort countermovement jumps on fouroccasions. Testing occurred over 2 d, twice per day (8 AM and 2 PM) separated by 7 d, with the same procedures replicated on each occasion. Jump height, peak power (PP), relative peak power (RPP), mean power (MP), peak velocity (PV), peak force (PF), mean force (MF), and peak rate of force development (RFD) measurements were obtained from a linear optical encoder attached to a 40 kg barbell. Results: A …
Testing An Exergame For Effectiveness And Attractiveness, Jeffrey Ronald Sinclair, Philip Hingston, Martin Masek, Kazunori Nosaka
Testing An Exergame For Effectiveness And Attractiveness, Jeffrey Ronald Sinclair, Philip Hingston, Martin Masek, Kazunori Nosaka
Research outputs pre 2011
In this paper, we report on an experimental study in which we investigated the use of feedback mechanisms in exergames. We based the study around the Dual Flow model for exergame design, using biophysical feedback to control exercise intensity, and player performance feedback to control gameplay challenge. We found good success in controlling exercise intensity to achieve an effective workout, while controlling gameplay challenge to improve enjoyment and attractiveness was problematic. We offer some possible reasons for this, suggesting the need for further investigation.
Vario Health Institute: Exercise As Medicine, Prue Cormie
Vario Health Institute: Exercise As Medicine, Prue Cormie
ECU Research Week
Research findings within the Vario Health Institute and how the Institute puts the research into practice.
Low Back Pain In Schoolgirl Rowers: Prevalence, Bio-Psycho-Social Factors And Prevention, Debra Perich
Low Back Pain In Schoolgirl Rowers: Prevalence, Bio-Psycho-Social Factors And Prevention, Debra Perich
Theses: Doctorates and Masters
Rowing is one of the largest participant sports on the Independent Girls‟ Schools Sporting Association (IGSSA) in Western Australia with approximately 400 participants competing every year. Rowing is an extra-curricular sport offered to girls 14 years of age and above, with these girls competing and training in both sweep and scull boats. Whilst the benefits of regular physical activity and exercise are well known, musculoskeletal problems have been documented in rowing. In particular, clinical evidence and previous research suggests that low back pain (LBP) is common in rowers. Adolescents who suffer from LBP are at an increased risk of recurrent …