Alireza Niknam

• Ph.D. of exercise physiology
• Researcher at Shiraz University

Background: Purple grape juice (PGJ), a natural carbohydrate- and polyphenol-rich supplement, may enhance exercise performance. This study, incorporating individual response analysis, examined the acute effects of PGJ ingestion on endurance, explosive power, and perceived fatigue in elite male soccer players. Methodology: Twenty-two U-20 male socc...

Abstract Background This study explores the combined effects of post-activation performance enhancement (PAPE) and caffeine (CAF) supplementation on explosive power, sprint performance, and anaerobic capacity in recreationally active men. Method In a double-blind, crossover design, twenty participants completed four sessions with distinct intervent...

While regular exercise training is known to decrease oxidative stress (OS) and enhance antioxidant functions in adults, limited data exist on OS responses in the pediatric population. This study aimed to investigate the effects of high-intensity functional training (HIFT) on oxidative stress and physical performance in adolescent soccer players. In...

Background This study aimed to evaluate the effects of varied doses of acute caffeine supplementation on performance indices and perceived muscle pain in kickboxing athletes. Methods Twelve kickboxing athletes participated in 3 exercise sessions with either caffeine supplementation (3 mg/kg [C3], 6 mg/kg [C6]), or placebo (PLA). A one-week wash-out...

This study investigated the effect of plyometric training with and without additional load on young male soccer players' jumping ability and isokinetic strength. Methods: In this randomized controlled trial, 39 U-17 male trained soccer players were randomly divided into plyometric training with additional load (PT+AL), plyometric training with just...

This study investigated the effect of plyometric training with and without additional load on young male soccer players’ jumping ability and isokinetic strength. Methods: In this randomized controlled trial, 39 U-17 male trained soccer players were randomly divided into plyometric training with additional load (PT+AL), plyometric training with just...

Background: In the realm of sports science, nutrition is a well-established pillar for athletes' training, performance, and post-workout recovery. However, the role of gut microbiota, often overlooked , is a novel and intriguing aspect that can significantly impact athletic performance. With this in mind, our study ventures into uncharted territory...

Background Although several studies have evaluated the effect of coffee on sports performance, the effect of caffeine on sports performance during fatigue status is not clear yet. Objective This study aimed to determine the effect of high and low doses of coffee on repeated sprint test (RST), perceived fatigue (PF), and eye-hand coordination (EHC)...

Purpose: This study aimed to evaluate the effects of acute caffeine supplementation of varied doses on kickboxing athletes' performance indices and perceived muscle pain. Methods: Twelve kickboxing athletes participated in 3 exercise sessions and caffeine supplementation comprising doses of 3 mg/kg (C3), 6 mg/kg (C6), or 3- placebo (PLA) with a on...

Objectives: In middle-aged women, the postmenopausal period is associated with increased oxidative, inflammatory, and psychological stress. We intend to investigate the effect of home-based aerobic exercise (HAE) on serum levels of 8-hydroxy-2’-deoxyguanosine (8-C) and the expression of telomerase reverse transcriptase (TERT) in leukocytes of postm...

Background: The improvement of performance and skill indices of volleyball players can affect their success rate. Therefore, the present study aimed to evaluate the effects of acute caffeine supplementation of varied doses on collegiate volleyball players' specific performance and skills. Method: This research was a randomized, double-blind, cro...

Background: Beetroot juice (BRJ) contains various bioactive compounds suggested to be effective in improving athlete recovery. However, the number of studies evaluating the effects of BRJ on recovery and muscle soreness (MS) indicators in female athletes is limited. Therefore, the present study aimed to determine the effects of BRJ consumption on...

Background & purpose: Postmenopausal period are associated with increased oxidative, inflammatory and psychological stress in middle-aged women. The aim of this study was to investigate the effect of home-based aerobic exercise (HAE) on serum levels of 8-hydroxy-2'-deoxyguanosine (8-OHDG) and the expression of telomerase reverse transcriptase (TERT...

ABSTRACT Background Mouth-rinsing with ergogenic solutions such as carbohydrate and caffeinated drinks has been considered among athletes as a practical nutritional strategy. Therefore, this study aimed to determine the effect of repeated coffee mouth-rinsing (CMR) doses on specific performances of futsal players. Method Twenty-four male futsal pl...

Regular exercise training can decrease oxidative stress (OS) and up-regulate antioxidant functions in adult population. However, limited data exists considering OS responses in the pediatric population. The aim of this study was to investigate the effect of high-intensity functional training (HIFT) on the OS and performance in adolescent soccer pla...

The postpartum period is the period after delivery, which can be divided into four phases, i.e., acute phase - the first 24 hours after delivery of the placenta, early – up to 7 days, late – up to 6 weeks to 6 months, and after 6 months up to 1 year. Each phase has its unique considerations and symptoms which can be reduced through exercise activit...

The window of trainability is a vital concept that should be considered by strength and conditioning coaches when designing a training plan for adolescent athletes. The aim of the study was to determine the impact of eight weeks functional high-intensity circuit training (FHICT) on muscle function, oxidative stress responses and antioxidant status...

High Intensity Circuit Training (HICT) or Functional High Intensity Circuit Training (FHICT), Is a new form of High Intensity Interval Training (HIIT), that is done like a circular resistance training, using body weight and performing functional movements. The results of previous studies on functional responses, body composition, and biochemistry i...

This data includes the information of 20 teenage football players, which includes anthropometric characteristics and indicators of oxidative stress and physical performance. This data is classified into two groups before and after an 8-week intervention.