Daniel Dylan Cohen

• Researcher at University of Limerick

BACKGROUND: On-pitch rehabilitation is key to supporting return-to-sport in elite soccer (football). The control-chaos continuum ( CCC) guides practitioners through the sport-specific components of return-to-sport. There is a need to update the framework with recent research in injury neurophysiology, soccer performance, and coaching science. CLINI...

BACKGROUND: On-pitch rehabilitation is a crucial part of returning to sport after injury in elite soccer. The control-chaos continuum ( CCC) initially offered a framework for practitioners to plan on-pitch rehabilitation, focusing on physical preparation and sport-specificity. However, our experiences with the CCC, combined with recent research in...

Introduction: Low muscle strength is a risk factor for various health conditions such as cardiometabolic diseases, neurodegenerative syndromes and mortality. Objective: Evaluate the knowledge of muscle strength in health professionals in Colombia. Materials and Methods: An analytical cross-sectional study was conducted in health professionals atten...

Horizontal deceleration is a critical locomotor skill underpinning the many changes of speed and direction performed by athletes in multi-directional sports. Despite its importance there are currently no evidence-based guidelines on how to improve horizontal deceleration ability. Therefore, the aim of this article is to provide practitioners tasked...

Debido a la potencia y la velocidad, la patada es el gesto técnico más utilizado en el Taekwondo para la obtención de un punto. Por ello, la fuerza explosiva y las variables relacionadas son de interés para el control del entrenamiento y la mejora del gesto técnico. El objetivo de este estudio fue conocer la asociación entre la potencia desarrollad...

Purpose This study aimed to investigate the variations on vertical jump and sprint performance during the first weeks of a futsal season. Methods Eleven elite futsal players, competing in Spain’s 1st division over the season 2019–2020, performed two countermovement jumps (CMJ) on a force platform and a sprint test of 10-m at three different timepo...

Background Preprofessional ballet dancers are exposed to the risk of injuries, primarily in the lower extremities, with most injuries occurring during jumping and landing activities. Interlimb asymmetry during jumping and landing activities has been associated with the injury risk in adolescent athletes, but this has not been examined in dancers....

The purpose of this study was to determine the variables of acute neuromuscular fatigue (NMF) and its correlation with the serum concentration of creatine kinase (CK) pre-and post-training through performance analysis counter movement jump (CMJ). Methods: Eight male endurance performance athletes performed 3 trials CMJ in force platform before and...

Background Abdominal obesity (AO) indirectly represents visceral adiposity and can be assessed by waist circumference (WC) measurement. In Latin America, cut-off points for the diagnosis of AO are based on Asian population data. We aim to establish the WC cut-off points to predict major cardiovascular events (MACE) and incident diabetes. Methods W...

Background: Metabolic syndrome (MetS) is a disorder associated with an increased risk for the development of diabetes mellitus and its complications. Lower isometric handgrip strength (HGS) is associated with an increased risk of cardiometabolic diseases. However, the association between HGS and arterial stiffness parameters, which are considered...

BACKGROUND: Sport-specific training is an integral component of returning to sport following injury. Frameworks designed to guide sport-specific rehabilitation need to integrate and adapt to the specific context of elite sport. The control-chaos continuum (CCC) is a flexible framework originally designed for on-pitch rehabilitation in elite footbal...

Objective To estimate the prevalence of cognitive impairment and its association with cardiovascular risk factors in the cohort population of the Prospective Urban and Rural Epidemiological Study (PURE) for the fifteenth year of follow-up in some departments of Colombia. Design and method Cross-sectional study nested in the PURE cohort in particip...

This study aimed to determine the within- and between-session reliability of ankle mechanics and vertical ground reaction forces (vGRF) during jump landings in turned-out and parallel foot positions in professional ballet dancers. Twenty-four professional ballet dancers (men = 13, women = 11) attended two data collection sessions where they complet...

Background: Strength and power is often reduced on the involved vs. contralateral limb and healthy controls following anterior cruciate ligament (ACL) reconstruction but no study has compared to pre-injury values at the time of return to sport (RTS). Hypothesis: Divergent recovery patterns in strength and power characteristics will be present at RT...

Isometric handgrip or (wall) squat exercise performed three times per week produces reductions in systolic blood pressure (SBP) in adults with hypertension. We aimed to compare these interventions and the potential to retain benefits with one exercise session per week. We compared blood pressure changes following handgrip and squat isometric traini...

Cardiovascular diseases (CVDs) remain the leading cause of worldwide death, accounting for significant morbidity, mortality, disability, and reduced quality of life. The global prevalence of cardiovascular (CV) risk factors, such as type 2 diabetes mellitus, hypertension, dyslipidemia, and obesity, has grown exponentially in the last decades, parti...

Howarth, DJ, McLean, BD, Cohen, DD, and Coutts, AJ. Sensitivity of countermovement jump variables in professional rugby union players within a playing season. J Strength Cond Res 37(7): 1463-1469, 2023-The aim of this study was to explore the measurement sensitivity of a wide range of countermovement jump (CMJ) variables to a full European professi...

Objective. To conduct an integrative review of all relevant research investigating the physical risk factors for injury within pre-professional ballet dancers, to provide insight that may benefit practitioners within these institutions and highlight areas for future research within this specialised population. Design. Studies were identified from...

This study aimed to investigate the within-and between-session reliability, variability, and minimal detectable change (MDC) of vertical ground reaction force (vGRF) during bilateral and unilateral lower extremity maximal isometric force tests. Eighteen participants (men: n = 9, age: 27.9 ± 6.3 y, height: 1.82 ± 0.06 m, mass: 82.4 ± 10.4 kg, streng...

Background: Nonalcoholic fatty liver disease (NAFLD) is one of the leading causes of chronic liver disease and is closely associated with cardiometabolic disorders, being insulin resistance (IR) the common pathogenic mechanism. The triglycerides/glucose (TyG) index and triglycerides/HDL-c (TG/HDL) ratio are markers correlated with IR. We compared...

A professional futsal season imposes a great amount of physiological and mechanical stress on players. The main aim of this study was to examine the changes in neuromuscular performance qualities across the season. Ten professional male players performed a 10-m sprint, standing long jumps (SLJ), and countermovement jumps (CMJ) during the competitiv...

Purpose: The purpose of this study was to assess the agreement between match-derived running load outputs; total distance (TD), high-speed running (HSR) and sprint distance (SPR) obtained by two optical tracking systems. Methods: Data were collected from 31 elite footballers from the first team and under-21 squads of an English Premier League (E...

Cardiovascular disease is the leading cause of death globally, accounting for approximately 32% of all deaths in 2019. There has been increasing interest in understanding the role of low muscular strength as a risk factor for cardiovascular disease, given its association with other cardiovascular risk factors such as hypertension, diabetes mellitus...

Efectos del entrenamiento de fuerza prensil y su asociación sobre la función vascular en sujetos con criterios diagnósticos de síndrome metabólico: una revisión de tema Revista Cubana de Investigaciones Biomédicas 2022; 41:e1411 RESUMEN Introducción: Diversos estudios han demostrado que la fuerza prensil se asocia con una menor mortalidad cardiovas...

RESUMEN Introducción: Diversos estudios han demostrado que la fuerza prensil se asocia con una menor mortalidad cardiovascular y no cardiovascular en diferentes poblaciones. Objetivo: Describir los efectos del entrenamiento de la fuerza prensil y su asociación sobre la función vascular de sujetos con criterios diagnósticos de síndrome metabólico a...

Objective: To evaluate the effect of two workplace isometric exercise interventions on blood pressure in hypertensive adults. Design and method: A randomized controlled multicenter clinical trial conducted in hypertensive (>130 mmHg systolic blood pressure (SBP)) 35 to 65 years old in work places in Colombia. Participants were assigned to either...

The aim of this study was to evaluate the impact on muscle strength, aerobic fitness and body composition, of replacing the physical education (PE) class of Colombian adolescents with resistance or aerobic training. 120 tanner stage 3 adolescents attending a state school were randomized to resistance training, aerobic training, or a control group w...

Rapid horizontal accelerations and decelerations are crucial events enabling the changes of velocity and direction integral to sports involving random intermittent multi-directional movements. However, relative to horizontal acceleration, there have been considerably fewer scientific investigations into the biomechanical and neuromuscular demands o...

The countermovement jump (CMJ) is used to profile and monitor lower body neuromuscular performance in a variety of sports. While jump height, peak power and peak force are commonly reported CMJ variables (CMJ-TYP), several temporal and rate-limited kinetic "alternative" (CMJ-ALT) variables have shown greater response to acute and chronic load, but...

The current UK physical activity guidelines recommend that adults aged 19 to 65 years perform activity to strengthen muscle and bone a minimum of twice weekly. The number of adults meeting strengthening activity guidelines is lower than for aerobic activity, but estimates vary between studies partly due to differences in how muscle-strengthening ac...

Background Hamstring strain injuries are the most common type of injury in elite football and are also associated with a high risk of reinjury, particularly those involving the intramuscular tendon (IMT). Limited information is available regarding the rehabilitation and return to sport (RTS) processes following such injuries. This case study descri...

BACKGROUND A higher prevalence of hypertension is reported among Afro-descendants compared to other ethnic groups in high-income countries, however there is a paucity of information in low- and medium-income countries. METHODS We evaluated 3745 adults from 3 ethnic groups (552 White, 2,746 Mestizos, 447 Afro-descendants) enrolled in the prospectiv...

Purpose: To assess the efficacy of a supervised in-school combined resistance and aerobic training program in adolescent girls and investigate whether responses differ according to birthweight. Methods: Participants (girls aged 13-17 y) were randomized either to an intervention replacing physical education (PE) classes with 2 × 60-minute trainin...

Investigate if a novel method used to classify stretch-shortening cycle (SSC) performance using force-time profiles in the drop vertical jump could provide additional insights into the qualities underpinning rapid horizontal deceleration ability in team sport athletes

Investigate the effects of repeated sprints with and without rapid horizontal decelerations on residual neuromuscular fatigue in professional male footballers

The athletic shoulder (ASH) test is a series of maximal isometric shoulder strength assessments performed at 3 different shoulder extension positions (I, Y, T) [1]. These assessments are a means to profile and monitor underlying neuromuscular performance in athletes/sports with an overhead/shoulder force production component that is critical to com...

Anterior knee pain (AKP) is a common in sports involving repeated jumps such as volleyball. Within the diagnosis of AKP, 45% of volleyball players are diagnosed with patella tendinopathy (PT). Potential associations between CMJ kinetics and AKP has not been evaluated in elite volleyball players. To determine if CMJ kinetics are associated with risk...

The ‘control-chaos continnum’ is an adaptable framework developed to guide the onpitch rehabilitation process in elite football. One of the key components of the continuum is to progressively return players to their preinjury chronic running load, while incorporating the qualitative aspects of movement and cognitive stresses integral to competitive...

Shared decision making for return to sport (RTS) is complex and typically influenced by advice from different stakeholders in the coaching, medical, and performance teams. Involving the player by listening to their needs is critical to RTS decision making, yet player narratives are rarely part of published research. In this editorial, we highlight...

Objective To evaluate presence of risk factors for cardiovascular diseases (CVD) and type 2 diabetes mellitus (DM2) in a group of health care workers. Methods During the X Latin American Congress of Internal Medicine held in August 2017, in Cartagena, Colombia, attendees were invited to participate in the study that included a survey on medical, p...

The purpose of this study was to investigate associations between, and within, drop jump (DJ) neuromuscular performance (NMP) qualities and maximal horizontal deceleration ability. We also compared DJ NMP qualities in “high” versus “low” horizontal deceleration ability athletes. Twenty‐nine university athletes performed: (1) DJs on force plates fro...

Howarth, DJ, Cohen, DD, McLean, BD, and Coutts, AJ. Establishing the noise: interday ecological reliability of countermovement jump variables in professional rugby union players. J Strength Cond Res XX(X): 000-000, 2021-The purpose of this study was to examine the interday "ecological" reliability of a wide range of ground reaction force-derived co...

The aim of this study was to evaluate the impact on muscle strength, aerobic fitness and body composition, of replacing the physical education (PE) class of Colombian adolescents with resistance or aerobic training. 120 tanner stage 3 adolescents attending a state school were randomized to resistance training, aerobic training, or a control group w...

Objectives To describe the incidence rate, severity, burden and aetiology of medical attention and time-loss injuries across five consecutive seasons at a professional ballet company. Methods Medical attention injuries, time-loss injuries and dance exposure hours of 123 professional ballet dancers (women: n=66, age: 28.0±8.3 years; men: n=57, age:...

Background Adiposity is a major component of the metabolic syndrome (MetS), low muscle strength has also been identified as a risk factor for MetS and for cardiovascular disease. We describe the prevalence of MetS and evaluate the relationship between muscle strength, anthropometric measures of adiposity, and associations with the cluster of the co...

Aims: Understanding the biomechanics of jumping in ballet dancers provides an opportunity to optimize performance and mitigate injury risk. This systematic review aimed to summarize research investigating kinetics and kinematics of jumping in ballet dancers. Methods: PubMed (MEDLINE), SPORTDiscus, and Web of Science were systematically searched...

Recent world events (i.e., COVID-19 pandemic) led to an unparalleled situation in sports. Players were forced to stay at home for a prolonged period and not allowed to use their team’s training facilities or even exercise outdoors. The main aim of this study was to examine the effects of the COVID-19 lockdown on neuromuscular performance and body c...

Hamstring strain injury (HSI) remains the most common muscle injury in high-intensity running in humans. The majority of acute HSI occur specifically within the proximal region of the long head of biceps femoris and there is a sustained interest among researchers in understanding the factors that predispose to HSI. The present critical review descr...

Resumen Objetivo Evaluar la presencia de factores de riesgo para enfermedades cardiovasculares (ECV) y diabetes mellitus tipo 2 (DM2) en un grupo de trabajadores de la salud. Métodos Durante el X Congreso Latinoamericano de Medicina Interna realizado en agosto del 2017, en Cartagena, Colombia, se invitó a los asistentes a participar del estudio q...

Establishing the level of risk, planning and adapting the return to sport (RTS) process following a complex knee injury involves drawing on a combination of relevant high-quality evidence and practitioner experience. A critical element of this process is on-pitch rehabilitation, providing an effective transition from rehabilitation to team training...

ACL injuries are among the most severe knee injuries in elite sport, with a high injury burden and re-injury risk. Despite extensive literature on the injury and the higher incidence of injury and re-injury in female athletes, there is limited evidence on the return to sport (RTS) of elite female football players following ACL reconstruction (ACLR)...

Preferiblemente en la ciudad de Bucaramanga y su municipios aledaños. Las edades permitidas son entre los 25 - 65 años y deben ser trabajadores que esten asistiendo de manera presencial a las instalaciones de la empresa.

Hamstring strains are the most common injury in elite football and typically occur during high-speed running. Despite its important contribution to power production in the late swing phase, injury to the semimembranosus (SM) is less common than to the biceps femoris, but may involve the free tendon and depending on the degree of retraction, warrant...

The COVID-19 pandemic forced elite football leagues into extended breaks followed by prompt resumption of competitive match-play. Inadequate periods of on-pitch football-specific training may underlie the increased injury incidence reported following the restart in a non-peer reviewed report. Detraining effects from isolated training are expected,...

Hypertension and type 2 diabetes mellitus are two important risk factors that contribute to cardiovascular diseases worldwide. In Latin America hypertension prevalence varies from 30 to 50%. Moreover, the proportion of awareness, treatment and control of hypertension is very low. The prevalence of type 2 diabetes mellitus varies from 8 to 13% and n...

This investigation aimed to determine the countermovement jump (CMJ) neuromuscular performance (NMP) qualities that differentiate between athletes with high or low horizontal deceleration ability. Twenty-seven male university team sport athletes performed a CMJ on vertical axis force plates and a maximal horizontal deceleration following a 20 m max...

Isolated injury to the long head of biceps femoris is the most common type of acute hamstring strain injury (HSI). However, the precise hamstring injury mechanism (i.e., sprint-type) is still not well understood, and research is inconclusive as to which phase in the running cycle HSI risk is the greatest. Since detailed information relating to hams...

Background: Prediabetes has been proposed as a risk factor for the development of type 2 diabetes mellitus (DM2) and cardiovascular disease (CVD). Despite the clinical importance of prediabetes, little is known about the level of knowledge, beliefs and barriers to screening and treating prediabetes amongst care health providers in Latin America. T...

Contact in elite football can result in severe injury such as traumatic fracture. Limited information exists regarding the rehabilitation and return to sport (RTS) of these injuries especially in elite football. We outline the RTS of an elite English Premier League footballer following a tibia-fibula fracture including gym-based physical preparatio...

The purpose of this study was to determine changes in two tests of lower limb isometric posterior chain force (IPC-F) following 90 min of match-play in elite youth soccer players and the interaction between relative strength and recovery profile. 14 players (age: 16 ± 2 years) performed 3 × 3 second IPC-F tests unilaterally at 30° and 90° of knee a...

Objetivos. Evaluar la concordancia entre la autoevaluación del desarrollo puberal mediante la escala de Tanner realizada por adolescentes, comparado con la evaluación efectuada por un médico entrenado. Materiales y métodos. Los datos de 244 adolescentes fueron recolectados como parte del proyecto SIMAC. En la línea de base incluimos una evaluación...

Delextrat, A, Bateman, J, Ross, C, Harman, J, Davis, L, Vanrenterghem, J, and Cohen, DD. Changes in torque-angle profiles of the hamstrings and hamstrings-to-quadriceps ratio after two hamstring strengthening exercise interventions in female hockey players. J Strength Cond Res XX(X): 000-000, 2019-The aim of this study was to compare the effects of...

El boletín de calificaciones (REPORT CARD) espera contribuir en el seguimiento y generación de acciones dirigidas a incrementar los niveles de actividad física de la población infantil en Colombia.

Purpose: The purpose of this study was to assess the interchangeability of position tracking metrics obtained using global positioning systems (GPS) versus those obtained by a semi-automatic high definition (HD) optical camera system. Methods: Data was collected from a cohort of 29 elite football players (age: 23.1 ± 5.1 years, height: 180.4 ± 5.8...

The instability of the knee and ankle joints are the main risk factors for injuries of the musculoskeletal system and soft tissues when they are subjected to high training loads, as is the case of the military in initial training. The lower train is subjected to accelerations, decelerations, changes of direction and jumps that involve high loads th...

Previous injury is associated with increased risk of future injury. Residual inter‐limb deficits are a potential contributing factor leading to compensatory movement patterns on return to sport. The purpose of this study was to examine the effects of previous severe injury on bilateral ground reaction force asymmetries measured during a countermove...

Risk factors, military personnel, medial tibial stress syndrome, biomechanical phenomena, kinetics, countermovement jump.

Aim To evaluate the reliability of isometric peak force (IPF) in a novel “long-length” 90°Hip:20°Knee (90:20) strength test and to compare the simulated soccer match induced fatigue-recovery profile of IPF in this test with that of an isometric 90°Hip:90°Knee (90:90) position test. Methods Twenty semi-professional soccer players volunteered for th...

Reliability study raw data: Coefficient of variation calculations for the 90:20 protocol. (XLSX)

Fatigue-recovery profile raw data: Individual values for each participant on the different time points using the 90:20 and 90:90 protocols. (XLSX)

The use of force platforms in upper limb monitoring. ASH Test and Plyometric Push Up (PPU) providing additional information to commonly used Hand Held dynamometer and grip strength dynamometer. Specifically the use of Rate of Force development (ASH test) and rate of load absorption (PPU) to provide information regarding an athletes readiness to pro...

Background: Dyslipidemia is a major risk factor for cardiovascular diseases (CVD). Worldwide, a third of ischemic heart disease is due to abnormal cholesterol levels and it is the most common cause of cardiovascular deaths in Colombia. In Colombia, no representative, large-scale study has assessed the prevalence of dyslipidemia. The aim of the pre...

Hamstring strains are the most common injury in multiple sprint sports, with inadequate eccentric hamstring strength and fatigue identified as important risk factors. Resistance training interventions aimed at reducing injury risk typically focus on the development of maximum strength, while little is known about the impact of training on hamstring...

Objectives Lower limb isometric tests are used to assess strength and strength asymmetries and monitor reductions in muscle force that may contribute to loss of performance and increase injury risk. Isometric tests in the upper body may be appropriate to monitor neuromuscular performance of the shoulder joint in sports involving contact and overhea...

Objectives: To identify temporal trends in muscular fitness of English children using allometric scaling for height and weight to adjust for the influence of body size. Design: Repeated cross-sectional study. Methods: We measured; height, weight, standing broad-jump, handgrip, sit-ups and bent-arm hang in 10-year-old boys and girls from Chelms...

Introduction Guidelines recommend early detection of type 2 diabetes mellitus (DM2). The objective of the present study was to evaluate the capacity to identify DM2 in subjects that were screened for DM2 simultaneously with all three of the tests recommended—fasting plasma glucose (FPG), glycosylated hemoglobin (HbA1c) and a 2-hour post 75-g oral g...

Database of the study population including 1119 subjects and 6 variables. (XLSX)

Background: There is evidence that children with high cardiorespiratory fitness and normal body mass index (BMI) have less risk of non communicable diseases (NCDs), however limited research was undertaken in Omani children. Therefore the aims of the present study were to describe body composition and physical fitness of a large cohort of Omani sch...