Javad Sarvestan

Newcastle University | NCL · Translational and Clinical Research Institute

This study was designated to investigate the kinematical differences between successful and faulty spikes, in order to identify the best strategies leading to better spike performance. Simulating a real-game condition, 13 elite youth attackers performed 6 spikes in the presence of 2 blocks. The kinematic variables of the spike performances were rec...

Whole body coordination patterning in volleyball spikes under various task constraints: exploratory cluster analysis based on self-organising maps, Sports Biomechanics To link to this article: https://doi. ABSTRACT Task and environment-related constraints can influence spike performance in volleyball players. This study was designated to investigat...

Background: Adaptation of the walking pattern to uphill walking demands immediate coordination between the lower limb segments. Nonetheless, knowledge about individual joints’ responses and variability in response to the new slope angles are missing. Aims: This study investigated the impacts of uphill walking on the ankle, the knee and the hip join...

Mobile phone use affects the dynamics of gait by impairing visual control of the surrounding environment and introducing additional cognitive demands. Although it has been shown that using a mobile phone alters whole-body dynamic stability, no clear information exists on its impacts on motor variability during gait. This study aimed at assessing th...

This study was aimed to analyse the lower limb kinematics during the change of direction (COD) performance with the dominant (DL) and non-dominant (NDL) leg using linear (traditional kinematics) and nonlinear (Self Organising Map-based cluster analysis) approaches. Three 5-0-5 COD performances with the DL and three with the NDL were performed by 23...

Intro The purpose of this study was to investigate the effects of quiet eye training (QET) on inhibitory control, visuospatial working memory (WM), and tonic attention in children with attention‐deficit hyperactivity disorder (ADHD). Methods Forty‐eight children with ADHD aged 9–12 years were randomly assigned to QET and control (CON) groups. The...

PurposeThis study investigated the effects of SportsMetrics neuromuscular training programs on core strength, balance and performance of female athletes with ligament dominance.Methods Eighty-four female athletes (30 volleyball, 30 basketball and 24 soccer players) with ligament dominance were equally divided into training group (TG) and control gr...

Accurate measurement of sedentary behaviour in older adults is informative and relevant. Yet, activities such as sitting are not accurately distinguished from non-sedentary activities (e.g., upright activities), especially in real-world conditions. This study examines the accuracy of a novel algorithm to identify sitting, lying, and upright activit...

In this study, the authors aim to determine whether lower limb strength is related to lower limb lean mass and whether this relationship is affected by lower limb functionality in physically active older women. Twenty-six women underwent measures of knee muscles strength and lean mass of lower limbs. Bilateral strength of the knee flexors and exten...

Problem statement: Given the importance of achieving optimal performance in sports, monitoring, predicting, and enhancing sports performance is an important element for coaches and trainers. This study aimed to investigate the correlation between the force-time (F-T) curve variables of the concentric phase of the countermovement jump (CMJ) and the...

The aim of this study was to investigate the effect of different volleyball-specific attentional focus instructions on arm velocities of a volleyball spike in young female volleyball players using the Statistical Parametric Mapping method. Twelve young female volleyball players (13.6 ± 0.6 years old, 1.8 ± 0.8 years of experience in volleyball trai...

Background: To prevent the risk of stair descent falls and associated injuries in the older adults, it is important to understand the factors that affect this frequent locomotion of daily living. The fact that falls are in most cases the result of the interaction between intrinsic and extrinsic factors is very often underestimated when designing t...

As predictive motor control is an important index of neuromotor development and maturation, we developed two touchscreen tablet-based tests of this function. Our aim was to investigate the reliability and validity of both a rapid manual interception test and a pursuit tracking test, using a sample of 124 children (62 boys and 62 girls) from two age...

This study aimed to compare the angle-specific (AS) and non-angle-specific (NAS) hamstring to quadriceps conventional and functional ratios between healthy, hamstring-and ACL-injured elite soccer players. One hundred and eleven players (27.42 ± 8.01 years, 182.11 ± 6.79 cm, 75.93 ± 7.25 kg) completed a series of concentric knee flexor and extensor...

Background: Stability is one of the key demands in human locomotion including running. Various kinematical analytical approaches are adopted to investigate the running strategies; nevertheless, the impacts of running speeds on the variability of angles in individual lower limbs joints is still unclear. Objective: This study was aimed to investigat...

Background Athletes with chronic ankle instability (CAI) are prone to recurrent ankle giving-way episodes due to impairments in the joint’s stress-shielding capacity. CAI can deteriorate athletes’ biomechanics and increase the risk of other lower limb injuries. One popular treatment for CAI is Kinesio tape (KT). The effects of lateral ankle support...

This study investigated the differences between force-time (F-T) curve variables of volleyball spike jumps (SpJ) in simulated real-game conditions, including timing, force measurements, velocity, and power among four groups of young sub-elite female volleyball players (Under-14, −16, −18 and −20). The 1-way ANOVA revealed that U-18 and U-20 players...

We performed a systematic review with meta-analysis of randomized controlled trials (RCTs) to assess the effects of strength training (ST) as compared to alternative multimodal or unimodal exercise programs on the number of falls in older adults (≥60 years). Ten databases were con-sulted (CINAHL, Cochrane Library, EBSCO, EMBASE, PEDro, PubMed, Scie...

This study investigated the whole-body coordination patterning in successful and faulty spikes using self-organising map-based cluster analysis. Ten young, elite volleyball players (aged 15.5 ± 0.7 years) performed 60 volleyball spikes in a real-game environment. Adopting the cluster analysis, based on a self-organising map, whole-body coordination...

Stair descent is one of the most common forms of daily locomotion and concurrently one of the most challenging and hazardous daily activities performed by older adults. Thus, sufficient attention should be devoted to this locomotion and to the factors that affect it. This study investigates gender and age-related differences in balance control duri...

Ageing-related deterioration of the lower limb muscle strength could highly influence the functional performance of elderly adults, particularly females, which are more prone to injurious falls. Precise analyses on the effects of ageing on individual lower-limbs' muscle groups and their relationship with feeble functional performance could provide...

Context: Chronic ankle instability is documented to be followed by a recurrence of giving away episodes due to impairments in mechanical support. The application of ankle Kinesiotaping (KT) as a therapeutic intervention has been increasingly raised among athletes and physiotherapists. Objectives: This study aimed to investigate the impacts of an...

Background: Ankle Kinesio-taping (KT) is being globally used an intervention to provide the ankle joint complex with sufficient support against sudden excessive mechanical stress during various activities. However, its effects on proximal joints are unclear. This study investigated the impact of ankle KT on ankle-knee joint coupling in sagittal, fr...

Force-time (F-T) characteristics of countermovement jump (CMJ) are globally referenced as the main descriptors of athletic jump performance, particularly for volleyball players. Nevertheless, it is still unclear to what extent the vertical jump performance during testing is associated with jump performance during game-like conditions. This study wa...

Balance and lower limb strength deficits are associated with a high incidence of falls in older adults. This study investigated the association between balance control during and after stair descent onto a compliant surface and lower limb strength. Thirty-five women and 14 men participated in this study. Stair descent time, mean center of pressure...

BACKGROUND: Aging-related deterioration of the lower limb muscle strength could highly influence the functional performance of elderly individuals. OBJECTIVE: To investigate how advancing age impacts the lower limb muscle strength and consequently affects the balance and walking performance. METHODS: Twenty-seven community-dwelling elderly females...

Objectives To determine the effects of ankle Kinesio-taping (KT) on postural sway, lower limb ROM, and muscle activity during a unilateral balance tasks. Design Case control study design. Setting Data were collected at the human movement analysis laboratory. Participants 30 collegiate athletes with chronic ankle sprain (11 females and 19 males,...

BACKGROUND: Sit-to-stand test is very often used as measure of lower limb strength in elderly adults. However, the recent findings indicate that performance in this test is also influenced by other factors. OBJECTIVE: To investigate the association between anthropometric, lower limb strength, and balance variables with the 5-repetition sit-to-stand...

Problem Statement:Limited physical functional performance as a consequence of aging is considered as a possible contributor to falls in older adults, even in physically active ones. Purpose: This study determines which clinical and laboratory tests simulating activities of daily living could distinguish age-related differences in functional perform...

Change of direction speed is globally assessed through temporal measurements. The underlying biomechanical mechanisms affecting Change of direction speed performance, however, could not be fully understood using performance duration. A more precise biomechanical analysis of change of direction speed performance in different phases of movement, incl...

Less or more serious injuries, prolonged convalescence, functional limitations and physical inactivity are the most frequent consequences of falls in elderly adults. Although there is a high prevalence of falls in this population, the risk of falling is not routinely diagnosed in clinical practice in this population in time. In this study, we focus...

Throwing velocity is one of the determinant scoring elements in handball. However, our knowledge of anthropometric factors and shoulder muscle strength among female players and how these affect throwing velocity is limited. This study aimed to assess the relationships between throwing velocity and the physical traits of anthropometric factors and s...

Force-Time (F-T) curve variables of the vertical jump are known as contributing factors in jumping height. Experience-related differences might also have impacts on kinetic and kinematic outputs of athletes’ jump. The aim of this study was to investigate the correlation between F-T curve variables with jump height (JH) and observe the differences b...

Background: Taping is a preventive measure commonly used for protecting and strengthening the ankle joint to prevent further musculoskeletal damage. Ankle taping prevents excessive range of motion (ROM) of the ankle joint and allows the improvement of proprioception to adjust balance. Appropriate ankle stability is essential for various activities...

Introduction: The importance of vertical jump in sports fields is widely recognized. Force-Time (F-T) curve variables of the vertical jump are known as contributing factors in jumping height. A study on F-T curve variables could lead to more focus on these parameters in jumping. Furthermore, experience differences might also have impacts on kinetic...

p class="BodyText1"> Background Within previous decade, sensitivity to arbitration systems in sports such as soccer, tennis and volleyball has been sharply increased and technicians turned to new technologies to fulfill the demands for a reliable judgement. Aim The main purpose of this study was to address a new method in judgement of presence of b...

Background The prevalent of ankle sprain is diagnosed diferent among both genders in various activities. Taping is gener- ally used as preventive means to protect the ankle joint and enhance the joint to prevent further musculoskeletal damage. Agility drill, as a vital factor for most activities, requires high ankle stability and sufcient range of...

Background: The importance of vertical jumps has been extensively recognised in sports. Furthermore, the main indicator of success in vertical jumps is the attained height, however, there is lack of knowledge on how the eccentric and concentric force–time curve variables affect the jump height. Objective: The objective of this study was to assess t...

Any athlete has his\her particular opinion on the definition of a fit body. Some people consider a fashion model as an on shaped body and others contemplate that a stocky broad-shoulder body is a fit body. It is important to note that physical fitness is not defined by an appearance. Physical fitness includes multi-factors that are defined as two g...

B alance plays a vital role in everyday life, especially in people who suffer from hearing problems and weaker in keeping bady balanced. Body type, is also known as an important factor in balance. Therefore, the purpose of this study was to assess balance tests in partially deaf society regarding to body type. With institutional ethics approval, 36...

The importance of vertical jump in sport fields and rehabilitation is widely recognized. Furthermore, Force-Time variables of vertical jump are factors affecting jumping height. Exclusive review of each of this variables, in eccentric and concentric phases, can lead to a specific focus on them during jumping exercises. So, the aims of his study wer...

The importance of vertical jump in sport fields and rehabilitation is widely recognized. In addition, Force-Time variables of vertical jump are factors affecting jumping height. Exclusive review of each of this variables, in eccentric and concentric phase, can leads to more focus on them during jumping exercises. So, the aims of his study were to a...