Daniel Jerez-Mayorga

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• PhD
• Researcher at University of Granada

Background Older adults with hip osteoarthritis (OA) suffer a progressive loss of muscle quality and strength, affecting their daily activities and quality of life. The purpose of this study is to compare the levels of isometric strength among older adults with and without hip OA and healthy young adults, and to determine the relationship between m...

This study aimed to compare the within-session reliability and magnitude of velocity variables recorded against a range of submaximal loads during the bench press (BP) exercise performed in a Smith machine using different grip widths. Sixteen physically active men (BP one-repetition maximum [1RM] relative to body mass = 1.01±0.19 kg.kg-1) were rand...

To determine the utility of the muscle quality index (MQI) as a predictor of osteoarthritis (OA) and to assess the influence of strength and body composition manifesta- tions in subjects with hip OA. Methods: Fifty subjects (21 men and 29 women, 66.4 ± 5.3 years) participated in this study. Of them, 25 subjects had unilateral hip OA, and 25 healthy...

This study examined the differences in the bench press one-repetition maximum obtained by three different methods (direct method, lifts-to-failure method, and two-point method). Twenty young men were tested in four different sessions. A single grip width (close, medium, wide, or self-selected) was randomly used on each session. Each session consist...

Muscle power is a better indicator of musculoskeletal health and functional capacity than muscle strength. The Load-Velocity (L-V) relationship provides a method for assessing muscle function during dynamic multi-joint movements, making it valuable for identifying age-related neuromuscular decline. This study aimed to examine the relationship betwe...

Objective: To determine the association between foods habits with mental health (i.e., anxiety, depression, and stress) and executive function (i.e., attention, inhibition, working memory, and cognitive flexibility) in Chilean children and adolescents. Methods: A cross-sectional study with 498 children and adolescents (52.6% female) aged 10–17 year...

Objective This study aimed to determine the association between changes in lactate production and levels of physical activity in a group of healthy young adults in response to two squat training protocols. Material and methods Twenty-nine students majoring in Sports Science willingly participated in this study. Participants visited the lab four ti...

Background/Objectives: Aging involves a series of changes non-pathological age-related conditions, some of which impact the cognitive functioning of older adults. Executive functions are cognitive skills often affected in this process, although they have been shown to improve after physical exercise interventions. This protocol aims to describe the...

Background Shoulder pain is one of the most common musculoskeletal complaints in overhead athletes. This study investigated the prevalence of the main risk factors and sex differences related to the development of shoulder pain in a cohort of amateur overhead athletes. Hypothesis The external rotation/internal rotation (ER/IR) isometric strength r...

The main purpose of this study was to assess the changes in energy expenditure (EE), oxygen volume (VO 2 ), heart rate (HR), and velocity (V) measurements obtained during three sets of each of two squat training protocols in a group of healthy young adults. Twenty-nine students of Sports Sciences volunteered to participate in this study. They atten...

Background: this study aimed to identify the influence of postural stability on upper-limb bilateral deficit (BLD), and to compare the assessment of strength generated during elbow flexion functionally vs. analytically in the dominant and nondominant arms. Methods: Twenty men participated in two sessions to evaluate the maximum isometric strength o...

Background There is limited evidence about exercise performance during postoperative immobilization. This study aimed to quantify the muscle activity in the immobilized shoulder girdle in an abduction and neutral rotation position during a battery of contralateral activities and ipsilateral exercises of the upper limb in healthy volunteers and pati...

Introducción: La pérdida progresiva de la función neuromuscular va a conllevar a grados de discapacidad y disminución de la independencia en la realización de actividades de la vida diaria y fuerza muscular. El propósito de la investigación fue determinar el comportamiento del índice de calidad muscular (MQI) en sujetos con osteoartritis de cadera...

Change of directions (COD) involves multidirectional and complex actions, with performance influenced by multiple factors. As lower limb strength is one of the most determinant of COD performance, the present study aimed to (a) explore the differences in strength outcomes across different lower limb muscle actions between faster and slower basketba...

Background: This study aimed to examine the effects of a six-week of concurrent training using high-intensity interval plus resistance training on flow-mediated dilation and pulse wave velocity in hypertensive, elevated blood pressure, or normotensive. A secondary goal was to analyze the inter-individual variability. Methods: A randomized controlle...

Obesity is a major health burden worldwide. Although bariatric surgery (BS) is recognized as an effective strategy for weight loss and comorbidities improvement, its impact on muscle strength and quality is still unclear. We aimed to examine postopera-tive changes in muscle strength and quality and their relationship with body mass index (BMI) chan...

There is evidence that promoting school physical activity (PSPA) benefits children and adolescents, but little is understood about how this promotion may relate to academic achievement and school climate across varying levels of socioeconomic status (SES). Hence, the study aimed to address this knowledge gap by examining two main objectives: (1) de...

Existe limitada información respecto a la reducción de la rigidez arterial entre sujetos con hipertensión y factores de riesgo para enfermedades vascular-metabólicas (i.e., de los vasos sanguíneos), donde el ejercicio induce un rol fisioterapéutico y preventivo. El objetivo del estudio fue 1) testear los efectos de 6 semanas de ejercicio concurrent...

Relationship between natural muscle oscillation frequency and lower limb muscle performance during instrumented sit-to-stand and stand-to-sit movements on a novel device in sedentary subjects. Please cite this article as: Maximiliano Torres-Banduc, Daniel Jerez-Mayorga, Luis Chirosa-Ríos, Paula L. Plaza and Ignacio Chirosa-Ríos, Relationship betwee...

Most of the existing research has focused on jump plyometrics, where landing reaction forces must be dissipated among lower limb articulations. In contrast, the investigation of resisted plyometrics without jumping, devoid of such landing forces, remains relatively limited. This study aimed to (i) investigate the impact of resisted plyometrics with...

Barrera-Domínguez, FJ, Martínez-García, D, Jerez-Mayorga, D, Chirosa-Ríos, LJ, Almagro, BJ, and Molina-López, J. Vertical versus horizontal training for improving the change of direction speed in adult basketball players: a systematic review and meta-analysis. J Strength Cond Res XX(X): 000–000, 2023—The ability to perform changes of direction (COD...

Skeletal muscle can be assessed in a number of different ways. Consequently, ultrasound evaluation has become a relevant diagnostic tool. This procedure allows measuring muscle thickness (MT) and pennation angle (PA). Furthermore, during the initial training of physical therapists it is important in a diagnostic procedure, to exercise reliability i...

Background: A greater motivation for coaches to be more involved in assessment could be the development of specific strength tests closer to specific handball tasks. Therefore, the aims were to determine the reliability of a handball specific strength test battery in young handball players using a functional electromechanical dynamometer (FEMD) an...

Introduction: The load-velocity relationship is a method to assess neuromuscular capacity, while the Sit-to-Stand test (STS) is an indicator of functional capacity. However, there is little literature on the load-velocity relationship with incremental loads during STS using a functional electromechanical dynamometer (DEMF) and its association with...

A good muscle quality index (MQI) may have an inverse relationship with psychosocial variables of depression, anxiety, and stress in adolescents. Unfortunately, little scientific evidence has related MQI to psychosocial variables in this population. Therefore, this research aimed to determine the relationship between the MQI and psychosocial variab...

Resumen Introducción: la fuerza muscular del tronco desempeña un papel crucial en diferentes aspectos relacionados con la salud, entre ellos la aparición del dolor lumbar no específico (DLNE). Los objetivos del estudio fueron (i) analizar las diferencias del tiempo en el test de plancha frontal (TPF) y variables de fuerza isocinética en sujetos sa...

Context: The aim of this study was to analyze the muscle activity of the hamstring muscles and the lateral gastrocnemius during different variants of the single-leg bridge (SLB) in futsal players. Design: Cross-sectional study. Methods: Twenty-two futsal players (age = 24.8 [3.9] y) volunteered to participate in this study. The participants perform...

Context: Current devices to assess strength performance in handball may not be sufficiently sports-specific and reliable methods. Functional electromechanical dynamometry is a new technology that allows the development of accurate strength tests in athletes. Purpose: To determine the absolute and relative reliability and to compare the reliability...

Background: Trunk rotator strength plays an important role in sports performance and health. A reliable method to assess these muscles with functional electromechanical dynamometer has not been described. Therefore, the objectives of this paper were (I) to explore the reliability of different strength variables collected in isokinetic and isometri...

The main objective of this study was to determine the differences in energy expenditure (EE) according to sex during and after two different squat training protocols in a group of healthy young adults. Twenty-nine Sports Sciences students volunteered to participate in this study. They attended the laboratory on four different days and completed fou...

Assessment of muscle quality and architecture is important for understanding and quantifying muscle changes associated with aging and a sedentary lifestyle and provides information on the muscle's ability to generate strength, power, or function. The aims of the study were (I) to determine the association between muscle architecture parameters and...

The purpose of this systematic review was: a) to determine the quality of evidence from studies assessing the effects of different lower limb strengthening protocols on muscle activity, strength, and power in sedentary and/or physically inactive subjects; and b) to determine the effectiveness of lower extremity strengthening protocols on muscle act...

The aim of this study was to compare the effects of sit-to-stand (STS) training programs with 5 vs . 10 repetitions on muscle architecture and muscle function in sedentary adults. Sixty participants were randomly assigned into three groups: five-repetition STS (5STS), 10-repetition STS (10STS), or a control group (CG). Participants performed three...

Background: Low back pain is one of the leading causes of disability globally, with a high economic and social burden. A decrease or imbalance in trunk strength has been associated with the occurrence of low back pain and its severity. Trunk strength training is helpful in the treatment of Non-specific low back pain (NSLBP) patients. However, we d...

Introduction: The tests used to classify older adults at risk of falls are questioned in literature. Tools from the field of artificial intelligence are an alternative to classify older adults more precisely. Objective: To identify the risk of falls in the elderly through electromyographic signals of the lower limb, using tools from the field of ar...

Purpose: The purpose of this systematic review was (I) to determine the quality of evidence from studies evaluating the effects of strength training on the incidence of ankle injuries in soccer and (II) to determine the effectiveness of strength training on the incidence of ankle injuries in soccer. Methods: Preferred Reporting Items for Systematic...

Objective: To evaluate the effects of exergames added to a conventional physical therapy (CPT) program on functional fitness (FF) and dynamometric muscle performance for the sit-to-stand (STS) maneuver in older adults and to compare their results concerning a CPT-only intervention. Materials and Methods: Fifty independent older adults were randomly...

ABSTRACT Introduction: In clinical practice, the functional tests used to assess the risk of falls require precision techniques and elements that avoid subjectivity. The use of the Wii Balance Board (WBB) is an alternative to the above, since it is an inexpensive, portable tool that allows extracting variables that are related to the phenomenon un...

Background: Muscle quality index (MQI) is an emerging health indicator obtained by dividing handgrip strength by body mass index (BMI) that needs to be studied in morbidly obese patients (defined by BMI ≥ 35 kg/m2). Objective: To determine the association between MQI, metabolic syndrome (MetS) markers, and cardiorespiratory fitness (CRF), and as...

Introduction: Determining the body composition and somatotype in sport talents provides a useful reference to improve the trajectory toward high-level competition. Objective: The aim of this study is to determine the body composition and somatotype by discipline of children and adolescents of both genders in the sport talent development program at...

RODRIGO LIZAMA-PÉREZ, R.; MUÑOZ-COFRÉ, R.; VIDAL-SEGUEL, N.; CHIROSA, R. I.; JEREZ-MAYORGA, D.; INTELANGELO, L.; CHIROSA RÍOS, R. L. Influence of probe position in the measurement of muscle thickness and its association with lean mass: an ultrasound study. Int. J. Morphol., 41(2):640-645, 2023. SUMMARY: Skeletal muscles play a fundamental role in p...

OBJECTIVE Functional capacity is one of the main risk factors for falls among older adults. The aim of this systematic review and meta-analysis was to determine the effect of power training on functional capacity test (FCT) related to fall risk in older adults. DATA SOURCES Systematic searches were conducted in four databases, including PubMed,...

Objectives: A variety of factors are known to mediate on the intraocular pressure (IOP) response to resistance training. However, the influence of the body position adopted during resistance training on IOP remain unknow. The objective of this study was to determine the IOP response to the bench press exercise at three levels of intensity when perf...

Background: A method to assess the influence of sex and side testing on trunk rotator muscles has not been described. The purpose was to analyze the influence of sex and dominant and non-dominant sides (DS-NDS) on the reliability of two trunk rotator exercises and to study the relationship between the DS-NDS of two trunk rotator strength exercises....

The purposes were to synthesize as much scientific evidence as possible to determine the effect of core training on balance, throwing/hitting velocity or distance, and jumping in healthy subjects, identify the possible differences between isolated and combined core training on performance and study training and sample variables related to performan...

Screen time (ST) and abdominal obesity have a negative effect on health-related quality of life (HRQoL). However, there is little information regarding the mediating role of the muscle quality index (MQI) in these relationships. The aim of the present study was to investigate the association between HRQoL, physical status (i.e., anthropometrics and...

Background: Soccer is the most widely practiced sport in the world, demanding high-speed activities such as jumps, sprints and changes of direction. Therefore, having optimal levels of muscle strength improves performance and reduces the injury rate. Objectives: The objectives of our study were (i) to determine the dynamometric profile of hip mu...

Background: the main objective of this study was to evaluate the test-retest reliability of two different functional electromechanical dynamometry (FEMD)-controlled squat training protocols. Methods: twenty-eight healthy young adults volunteered to participate in this study. They attended the laboratory on four different days and performed four...

The severe training load of a competitive mesocycle may not be assimilated correctly by athletes, and can provoke endocrine imbalance, muscle damage and inflammation. Supplementation with antioxidants such as Phlebodium Decumanum (PHL) helps protect against such imbalances. The aim of this study is to analyse the effect of PHL on the fatigue during...

El propósito de este estudio fue analizar la efectividad de diversas estrategias de calentamiento sobre el rendimiento en pruebas contrarreloj hasta 200-m, mediante una revisión rápida de la literatura. Utilizando directrices PRISMA, se realizó una búsqueda en la base de datos MEDLINE/Pubmed considerando estudios experimentales desde el año 2013. L...

The main purposes of this study were to determine the absolute and relative reliability of two-step test (TST) with a functional electromechanical dynamometer (FEMD) in the evaluation of body displacement velocity. Sixteen physically active male handball players volunteers (age 21.4 ± 2.1 years) participated in this study. A repeated-measurement de...

The aims of this study were to: (I) examine the reliability of the abduction and adduction isokinetic strength measurements in healthy subjects and athletes; (II) determine which position is the most valid and reliable for strength measurement; and (III) determine the most reliable velocity to assess hip abductor and adductor strength. The database...

Background The aim of this study was to compare the reliability and agreement between two devices – Wii Fit Balance Board (WBB) versus Hand-Held Dynamometer (HHD) to measure isometric strength during the athletic shoulder (ASH) test in healthy amateur rugby players. Methods Fifteen males (23.73 ± 2.8 years) completed two testing sessions. Maximal...

The main objective of this study was to test the relationship between shoulder internal rotation strength and standing throwing velocity. A repeated measures cross-sectional study was conducted with 20 professional handball players (mean ± SD; age: 19.28 ± 2.55 years, weight: 81.52 ± 9.66 kg, height: 185 ± 6 cm, BMI: 23.74 ± 1.69). The participants...

Background: Cognitive dysfunction is a common complain in patients with fibromyalgia (FM). Aim: To assess the perceived cognitive function and cognitive performance in women with FM. Material and Methods: Cross-sectional study including 100 women with FM (FMG) and 100 healthy controls (CG). Self-perceived cognitive functioning was evaluated using...

Background: The knee-joint isokinetic profile (KJIP) injury risk factor may be modulated by chronological age, however, comparative data for elite male soccer players aged 25 years and older is lacking. Objective: To describe and compare the knee-joint isokinetic profile (KJIP) according to the chronological age of professional male soccer players....

Background: The trunk strength conventional ratio (CR) has been evaluated. However, the functional ratio and the ratio of strength to body weight (BW) or muscle mass (MM) have been poorly explored. Relative strength is a measure of muscle quality. Objectives: To analyze the trunk strength ratio normalized by BW and MM and compare the trunk's con...

This study aimed to analyze the effectiveness of various warm-up strategies on time trial performance up to 200-m through a rapid literature review. Using PRISMA guidelines, a search was performed in the MEDLINE/Pubmed database considering experimental studies since 2013. Methodological quality was assessed using the PEDro scale. From 181 initial r...

Background. Hypertension (HTN) is recognized as a significant public health problem in the world. The objective of this study is to evaluate emergent anthropometric indices as predictors of preHTN and HTN according to age and sex in a sample of Mexican adults. Methods. A cross-sectional study was conducted in 1,150 participants aged 18–80 years old...

Purpose: This study aimed to examine the reliability of trunk extensor strength assessment with a functional electromechanical dynamometer (FEMD). Methods: Thirty-one men performed strength assessment at different velocities (V) (V 1 = 0.15 m·s −1, V 2 = 0.30 m·s −1 , V 3 = 0.45 m·s −1) and range of movement (R) (R 1 = 25% cm; R 2 = 50% cm), and is...

The purpose of this study was to determine the reference values of the velocity of execution of the five Sit-to-Stand in older adults through a systematic review of the literature.Three databases were reviewed: Medline (PubMed), Scopus and Web of Science, with the deadline of March 2021.The search terms were: «sit to stand» OR «stand to sit» OR «ch...

Background: In line with the recommendations for sustainable development, SDG 3 highlights the importance of working on health and well-being. In this respect, strength training has proven to be highly effective. Improved physical performance in most sports is associated with increased maximum dynamic strength. The existing literature on strength t...

Background: Imbalance or decreased trunk strength has been associated with non-specific low back pain (NSLBP). Objective: This systematic review aimed (I) to evaluate the quality of evidence of studies evaluating the reliability of trunk strength assessment with an isokinetic dynamometer in NSLBP patients, (II) to examine the reliability of trun...

Background: The purpose of this systematic review was to determine the effect of antioxidant consumption on markers of oxidative stress and muscle damage after performing a muscle strength exercise. Methods: The Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) statements were followed. Four databases were used: Scopus,...

Background Serratus anterior strengthening generally appears in shoulder rehabilitation protocols. This study's aim was to measure electromyographic activity of the serratus anterior, upper trapezius, and infraspinatus muscles during the Supine Scapular Punch exercise in healthy volunteers and those with unilateral shoulder pain. Methods Fifty-fou...

The aim of this study was to determine the effect of bracing sequences technique on core stability and kata performance of karate athletes. 38 male karate athletes participated in the study divided into the experimental group (n=21) and the control group (n=17). The athlete performance test and core stability test were done at pre-test and post-tes...

Objective The purpose was to determine the association of lifestyle (i.e., Mediterranean diet [MD] adherence, physical activity [PA], screen time [ST]) and fitness with abdominal obesity (AO) and excess weight in the Chilean and Colombian schoolchildren. Research methods & procedures This cross-sectional study included 969 schoolchildren, girls (n...

LIZAMA-PÉREZ, R.; CHIROSA-RIOS, I.; CHIROSA-RIOS, L.; OLAVE; E.; FERRAGUT, C.; VILA, H. & JEREZ-MAYORGA, D. Effects of eccentric exercise on muscle architecture in adults: A systematic review. Int. J. Morphol., 40(2):425-432, 2022. SUMMARY: The purpose of this systematic review was to determine the effects of eccentric training on muscle architectu...

The purpose of this systematic review was to determine the effects of eccentric training on muscle architecture in the adult population. Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) statements were followed using keywords associated with architecture muscular and eccentric training. Four databases were used: PubMed, Sc...

Purpose: The objective of the study was to describe and compare the acute response of muscle oxygen saturation (SmO2) and hemoglobin concentration (Hgb) in the vastus lateralis (VL) during resistance exercise protocols until failure. Methods: Sixteen males were considered (mean ± SD, age = 36.12 ± 6.40 years). Two familiarization sessions and one e...

Although bariatric surgery (BS) is recognized as an effective strategy for body weight loss, its impact on cardiorespiratory fitness (CRF) is still unclear. We aimed to examine postoperative changes in CRF (VO2max/peak) and its relationship with weight loss among adults undergoing BS. We systematically searched the WoS, PubMed, MEDLINE, and Scopus...

Background: handgrip strength (HGS) is a health-status parameter associated with multicomorbidity in the adult population. Objective: the aim of the present study was to determine the association between HGS (i.e., absolute and relative) and abdominal obesity (AO), type-2 diabetes (T2D), and hypertension (HT), as well as to determine the associa...

Background: The objective of this systematic review and meta-analysis was to examine the reliability of isokinetic measurements of hip strength in flexion and extension in healthy subjects and athletes. Methods: The databases used were Web of Science, SCOPUS, Medline and PubMed. R was used for all statistical analyses. Results: Hip flexion sho...

The assessment of the strength and muscle mass of the hand-finger segment are reliable indicators of health and predictors of cardiometabolic risk in the adult population. However, there are no valid and reliable tests to assess the muscle power of this segment in healthy adolescents. The objective of this study was to determine the validity and in...

The overhead throw is a fundamental technical-tactical ability for overhead sports. The purposes of this review are to assess the effect of resistance training (RT) in enhancing throwing velocity in athletes and to investigate the relationships between age or gender in this effect. Control group trials were identified through looking up electronic...

The objective of this investigation was to determine the association between selective attention and concentration with physical fitness (i.e., cardiorespiratory fitness (CRF), V˙O2max, the standing long jump test (SLJ) and handgrip muscle strength (HGS)), lifestyle parameters (i.e., physical activity (PA) level, screen time (ST), sleep duration an...

Concurrent training (CT), characterised by combining both aerobic and resistance training modalities within the same session, is recognised to improve metabolic syndrome (MetS) markers, but little is known about the effects of different configurations (i.e., order) of these exercise modalities on MetS markers and the interindividual responses. The...

Abstract: The purpose of this study is to establish the absolute reliability between hand-held dynamometers (HHDs) and concurrent validity between HHDs and isokinetic dynamometers (IDs) in shoulder rotator strength assessment. The Medline, CINAHL, and Central databases were searched for relevant studies up to July 2020. Absolute reliability was det...

Background: Sleep is an important modulator of neuroendocrine function and glucose metabolism. Poor sleep quality is related to metabolic and endocrine alterations, including decreased glucose tolerance, decreased insulin sensitivity, and increased hunger and appetite. Objective: The aim of the present study was to determine the association betw...

The purpose of this cross-cultural study was to determine the association between the sociodemographic background of a child’s parents (i.e., their socioeconomic level, marital status, and educational level) with the child’s lifestyle (i.e., Mediterranean diet (MD), physical activity (PA) and screen time (ST)), and health markers. Material: This cr...

Objective: to determine lifestyle changes, such as physical activity, nutrition, and sleep in an Argentinean university population, caused by confinement during the COVID-19 pandemic. Methods: Cross-sectional study via web survey. 1021 the Argentinean university population (women, n = 645 and men, n = 376) aged between 18-70 years old was participa...

Background The use of a functional electromechanical dynamometer (FEMD) has been proposed as a valid and effective tool to evaluate specific movement patterns. The aim of this study was to determine the reliability of FEMD on swing eccentric hamstring exercise (SEHE) measures in soccer players. Methods Nineteen federated male soccer players (20.74...

Background: Mediterranean diet (MD) adherence, physical activity (PA) patterns, and physical fitness are associated with physical, social, and psychological health in children. Objective: the purpose of this study was to determine the association of items of MD adherence, fitness components, and lifestyle with psychological and social health in...

Background: The purpose of this study was to determine the reliability for the strength and movement velocity of the concentric phase from the five Sit-to-Stand (5STS), using three incre-mental loads measured by a functional electromechanical dynamometer (FEMD) in healthy young adults. Methods: The average and peak strength and velocity values of s...