Rafael Grazioli

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Verified

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• PhD
• Professor at University of San Francisco

It is recommended for athletes keep training to reduce the negative effects of detraining. This study aimed to verify the effects of a 15-week online training intervention during a pandemic quarantine in body composition and physical capacity of highly trained soccer players. Sixteen male under-20 soccer players were assessed after the first period...

This study investigated the associations between preseason and in-season physical performance measures with external workload [global system positioning (GPS) data] in professional soccer players. Twenty-one players completed hamstring eccentric strength, countermovement jump (CMJ), 20-m sprint, and Yo-Yo intermittent recovery tests before (preseas...

Background: In soccer, the capacity for acceleration and high-speed tasks extends beyond linear sprints to encompass a broad spectrum of multidirectional movements, including curvilinear sprints. We aimed to correlate mandatory speed-related capabilities with curve sprint (CS) performance in male professional soccer players. Methods: Twenty-one pl...

Resisted sprint training (RST) with sled towing has been commonly used by practitioners in soccer and other team-sports, which has led to an increased number of studies on this topic [1,2]. Nevertheless, there are important controversies regarding the optimal magnitude of the sled loads to use during sled training programs [1,3,4]. The present stud...

Background: Fencing is an agility sport and is characterized by a combination of short and frequent high intensity movements. Proprioceptive training demonstrates a positive effect on athletes' performance. It is effective in increasing dynamic balance by reducing ankle muscle reaction time that stabilize joint. Objective: The aim of this study was...

Background Online physical training programs emerged as an innovative approach to avoid the detraining-induced physical fitness impairments during the COVID-19 quarantine period in athletes. However, there is conflicting evidence on the effectiveness of such training programs in soccer players. Aim This study aimed to verify the effects of a 15-we...

A common pre-season injury prevention assessment conducted by professional football clubs is the hamstring-to-quadriceps (H:Q) strength ratio calculated by peak torque (PT). However, it is debatable whether players that present low pre-season H:Q ratios are more susceptible to further sustaining in-season hamstring strain injuries (HSI). Based upon...

Background: The effects of strength training on muscle strength imbalance are unclear in professional soccer players. As a result, this study examined the effects of an 8-week strength training program comprising eccentric-emphasized prone leg curl adjusted according to the individual strength imbalance status. Methods: Ten professional soccer pla...

Purpose: We examined the effects of two 8-week resisted-sprint training programs under different magnitudes of velocity loss (VL) on the speed-related performance of highly trained soccer players. Methods: Twenty-one soccer players (age: 25.9 [5.4] y) were randomly assigned to 1 of 2 groups: (1) the "moderate-load group," players who trained wit...

The aim of this study was to examine the effects of a 4-week detraining period on the neuromuscular performance of highly trained soccer players. Pre- and post-detraining, eighteen adult soccer players (age: 27 ± 4.9 years; height: 180.2 ± 7.1 cm; body-mass [BM]: 78.9 ± 7.6 kg) performed vertical jumps, 20-m linear sprints, curve sprint and change...

ABSTRACT A common pre-season injury prevention assessment conducted by professional football clubs is the hamstring-to-quadriceps (H:Q) strength ratio calculated by peak torque (PT). However, it is debatable whether players that present low pre-season H:Q ratios are more susceptible to further sustaining in-season hamstrings strain injuries (HSI)....

This study aimed to investigate the interindividual responses following two different concurrent training (CT) regimens in neuromuscular, cardiorespiratory and functional outcomes of older men. Thirty-five older men (65.8 ± 3.9 years) were randomly allocated into one of two CT groups: power training (PT) + high-intensity interval training (HIIT) (n...

Purpose: This 11-week study aimed to correlate the neuromuscular profile and the total volume of resisted sprint training (RST) under different velocity loss (VL) magnitudes in male professional soccer players. Methods: Seventeen soccer players (age 25.8±4.3 years; height 180.0±8.6 cm; weight 77.7±9.7 kg) were randomly allocated into two training...

We investigated the relationships between linear and multidirectional sprint tests in elite young soccer players, using different speed measurements and their associated deficits. Twenty-three under-17 and seventeen under-16 soccer players performed, on the same day: 17-m linear sprint (with 10-m split times), curve sprints for “good” and “weak” si...

Introduction: Figure Skating is a sport on the rise, especially the sport on wheels. The sport has several modalities with different physical and physiological profiles, however there is a limitation of information related to the profile of young athletes of figure skating on wheels. Objective: To identify the physical and physiological profile of...

Background Muscle strength imbalance assessment (e.g., hamstring-to-quadriceps ratio, H:Q) using traditional peak torque isokinetic measurements has been shown to be a weak risk factor predictor of future lower-limb injuries (e.g., hamstring strain and anterior cruciate ligament tear). In soccer, power-related tasks are commonplace and injuries are...

Background: Running is a very popular activity and muscle strength imbalance has been treated with caution to prevent injuries. Aims: The present study aimed to compare and correlate knee flexion and extension strength imbalance based on Peak Torque (PT) and total work (TW) in running athletes. Methods: Thirty-eight male amateur running athletes (...

Background: Volleyball is a complex intermittent sport characterized by short explosive technical movements, many of which involve vertical jumping. The assessment of mechanical jumping variables in relation to both injury prevention and performance enhancement through the use of wearable technologies is becoming a new training tool among professio...

Concurrent training (CT) is an efficient strategy to improve neuromuscular function and cardiorespiratory fitness in older adults, which are factors of pivotal importance for the maintenance of functional capacity with aging. However, there is a lack of evidence about the effectiveness of power training (PT) as an alternative to traditional strengt...

Background Fencing is a combat sport, which depends of lower limbs muscular strength and neuromuscular function. Because of that, approximately half of all injuries occur in lower limbs, especially in ankle. Thus, the objective of this study was to verify the influence of a twelve-week proprioceptive training program on ankle muscular strength and...

Objectives: This study aimed at verifying the effect of a football match on the eccentric knee flexor strength of male professional players along a 72-h period. Study design: Quasi-experimental study. Setting: Football club facilities. Participants: Fifteen players were assessed in four timepoints: 24 h before, immediately after, 48 h and 72 h afte...

Beyond the severe health crisis, the coronavirus disease 2019 (COVID-19) has also affected the high-performance sports scenario. In soccer, practitioners are concerned about the effects of long-term detraining on players’ conditioning, and caution is required when activities return. The present study assessed body composition, jump and sprint perfo...

This study investigated the effects of a 11-week moderate-to-heavy sled training intervention with different magnitudes of velocity loss on sprint and jump performance, mechanical muscle function, and body composition in professional soccer players. Seventeen players (age 25.8±4.3 years; height 180.0±8.6 cm; weight 77.7±9.7 kg) were randomly alloc...

This study investigated the effects of concurrent training performed either with repetitions to failure or not to failure in muscle power, muscle quality (MQ), peak oxygen uptake (VO2peak), and visceral fat in older men. This is an ancillary analysis of a randomized controlled trial. 36 older men (mean age ± SD; 67.1 ± 5.1 years) were randomized in...

This randomized clinical trial compared the neuromuscular adaptations induced by concurrent training (CT) performed with repetitions to concentric failure and not to failure in elderly men. Fifty-two individuals (66.2 ± 5.2 years) completed the pre- and post-measurements and were divided into three groups: repetitions to failure (RFG, n = 17); repe...

PurposeThere is a lack of information on the effects of power training (PT) as an alternative to traditional strength training (TST) during concurrent training (CT) in older individuals. This study aimed to verify the neuromuscular adaptations that occurred following 16-week interventions with two CT models in older men: high-intensity interval tra...

Abstract Background: Some athletes have been particularly adopted personal strength and conditioning coaches during their day to day routines. However, there are no studies about this complementary management. The present study aimed to screen injury incidence, match play, and market value parameters of topelite soccer players during seasons with a...

The present study compared the effects of 12 weeks of muscle power training performing one or three sets on muscle quality assessed by echo intensity (MQEI) and index (MQindex), muscle power-related outcomes, and functional capacity in older women. Participants were randomly assigned into two groups: 1SET (n = 13) and 3SET (n = 13). Lower limb musc...

This study compared the effects of 20 weeks of concurrent training with and without repetitions to failure on neuromuscular and functional adaptations in older men. Methods Thirty‐six older men (67.1 ± 5.1 years) were randomized into three groups: one performing repetitions to failure (RFG, n = 13), another performing repetitions not to failure an...

Match-induced fatigue of knee muscle strength and agonist-antagonist strength-ratios may affect both performance and risk of injury in soccer players. Once explosive tasks are imperative in soccer as well as hamstring strain injuries occur during high-velocity moments, rapid force capacity of this muscle group is especially important. This study ev...

Introduction: Understanding the recovery in response to different sprint protocols is important for optimizing neuromuscular gains and organizing training sessions in sports. The current study aimed to investigate acute neuromuscular changes following a moderate volume of sprint protocols with and without change-of-direction. Methods: 26 well-tr...

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Aim: Exercise is one of the most important components in frailty prevention and treatment. Therefore, we systematically reviewed the effect of resistance training (RT) alone or combined with multimodal exercise intervention on muscle hypertrophy, maximal strength, power output, functional performance, and falls incidence in physically frail elderl...

Background The fencer performs the lunge, an attack characterized by a forward push. AimsThe objective of the study was to compare the neuromuscular and proprioceptive variables between the front and back legs during the lunge. Methods It was a cross-sectional study of 19 fencers. Measurement of the concentric muscle torque peak of the ankle muscle...

Isokinetic hamstring to quadriceps ratios are frequently used to assess knee muscle strength imbalances and risk of injuries/re-injuries. The use of peak torque (PT) or total work (TW) to estimate joint stability may lead to different results because of the differences between these two neuromuscular variables. Thus, the current study aimed to comp...

Purpose: This study compared the concentric and eccentric training effects on fatigue induced by eccentric and concentric protocols. Methods: Twenty-two men and women (22 ± 3.6 years) were assigned to concentric (GCON, n=11) or eccentric training (GECC, n=11). The concentric (CON) and eccentric (ECC) protocols were composed of 4 sets of 20 knee...

The footvolley practice has been growing around the world. However, there is no displacement and neuromuscular information in response to a match for helping coaches on training prescription. Current study aimed to screen distance and fatigue-induced parameters of a professional Brazilian footvolley match. Three professional athletes participated o...

O treinamento de velocidade (sprint) é difundido em diversas modalidades esportivas e amplamente utilizado visando adaptações importantes no desempenho. A compreensão do tempo de recuperação em resposta a diferentes métodos de treino de velocidade torna-se instrumento importante na organização e otimização do treinamento na rotina esportiva. Este e...

In this meta-analysis, we investigated the effect of resistance training (RT) alone, or included in a multimodal training on physical frailty outcomes, and whether different variables of RT prescription affect these outcomes. We identified 15 relevant studies searching through MEDLINE, Cochrane Central, SPORTDiscus and PEDro database. Post-interven...

RESUMO Introdução: os efeitos do treinamento de força concêntrico e excêntrico na fadiga induzida por exercício concêntrico e excêntrico têm sido pouco investigados. Objetivo: comparar os efeitos do treinamento concêntrico e excêntrico na força muscular durante protocolos de exercício concêntrico e excêntrico. Métodos: 22 homens e mulheres adultos...

ASSOCIAÇÃO ENTRE A FORÇA DE PREENSÃO MANUAL E A VARIABILIDADE DA FREQUÊNCIA CARDÍACA