Sofyan Sahrom

National Youth Sports Institute

Background: During a prolonged quarantine, there is a need to monitor aerobic fitness levels of trained individuals who are isolated with a simple fitness test that can be performed in confined space of their own homes. This study examined the reliability, validity, usefulness and sensitivity of a novel 3-min submaximal heart rate burpees test (or...

Tennis match performance is often evaluated by a player's internal (heart rate) and external (match analytics) outcomes. Numerous factors could influence these outcomes, including the time of day, which may be advantageous or not depending on a player's chronotype. This study aimed to determine the influence time of day, chronotype and sleep–wake b...

Due to a prolonged period of quarantine during the COVID-19 pandemic, it is essential to monitor the physical condition of athletes isolated at home with a fitness tool that measures various aspects of physical fitness, which does not require any special equipment, and can be performed within a small space. This study assessed the reliability and v...

We examined the extent to which Ramadan fasting affects badminton skill performance under simulated (i.e., competitive) match-play conditions. Ten male Muslim national-level badminton players performed a 40-min (2 sets x 20 min per set in each match) badminton single matches in a non-fasted (CON) and in Ramadan-fasted (RAM) state on separate occasi...

Temporal changes in ground reaction force magnitudes reflect movement strategy, and thus underlying muscle activation patterns, during movement tasks. Speculatively, these changes may be observed more readily when the force-time signal is differentiated, yielding the yank-time signal. However, the differentiation process, including the signal filte...

Detailed examinations of both the movement and muscle activation patterns used by animals and humans to complete complex tasks are difficult to obtain in many environments. Therefore, the ability to infer movement and muscle activation patterns after capture of a single set of easily obtained data is highly sought after. One possible solution to th...

The Fédération Internationale de Natation implemented rule changes in 2013 to promote more dynamic movement, creativity, explosive speeds and reduce static situations in water polo. This study aimed to determine if the intents of the rule changes were met. The characteristics of 16 international matches played by the same team under both the old (n...

This study examined the associations between pre-game wellness and changes in match running performance normalised to either (i) playing time, (ii) post-match RPE or (iii) both playing time and post-match RPE, over the course of a field hockey tournament. Twelve male hockey players were equipped with global positioning system (GPS) units while comp...

Abstract Objective: This cross-sectional study aims to compare the differences between the countermovement jump (CMJ) and concentric only squat jump (SJ) (no arm swing) and examine the differences and slow SSC ability of youths at different stages of maturation (pre-pubescent, pubescent and post pubescent). Methods: 101 male and 109 female Singapor...

ABSTRACT: EXTENSIVE RESEARCH HAS INVESTIGATED STRETCH-SHORTENING CYCLE (SSC) PERFORMANCE IN ADULTS; HOWEVER, TO DATE, ONLY A FEW STUDIES HAVE INVESTIGATED SSC ABILITY IN YOUTHS. YOUTHS UNDERGOING PUBERTY EXPERIENCE MANY PHYSIOLOGICAL CHANGES, WHICH INCLUDE CHANGES TO NEUROMUSCULAR AND MUSCULOTENDINOUS SYSTEMS. TO UNDERSTAND THE POSSIBLE DIFFERENCES...