Alun G. Williams

ORCID: 0000-0002-8052-8184
Publications
Citations
Views
---
Saved
---
About
Contact & Profiles
Research Areas
  • Genetics and Physical Performance
  • Sports Performance and Training
  • Cardiovascular Effects of Exercise
  • Sports injuries and prevention
  • Muscle metabolism and nutrition
  • Muscle Physiology and Disorders
  • Body Composition Measurement Techniques
  • Occupational Health and Performance
  • Cardiovascular and exercise physiology
  • Muscle activation and electromyography studies
  • Tendon Structure and Treatment
  • Genetic Associations and Epidemiology
  • Cerebral Palsy and Movement Disorders
  • Nutrition and Health in Aging
  • Adipose Tissue and Metabolism
  • Doping in Sports
  • Lower Extremity Biomechanics and Pathologies
  • Botulinum Toxin and Related Neurological Disorders
  • Glycogen Storage Diseases and Myoclonus
  • Traumatic Brain Injury Research
  • Bone health and osteoporosis research
  • Pancreatic function and diabetes
  • Exercise and Physiological Responses
  • Epigenetics and DNA Methylation
  • Reproductive Physiology in Livestock

Manchester Metropolitan University
2016-2025

University College London
2016-2025

Swansea University
2021-2025

English Institute of Sport
2014-2025

Genomics (United Kingdom)
2012-2022

St Mary's University Twickenham London
2022

University of Alabama at Birmingham
2017

Sheffield Hallam University
2016

Volga Region State Academy of Physical Culture, Sports and Tourism
2012

Kazan State Medical University
2012

High-speed actions are known to impact soccer performance and can be categorized into requiring maximal speed, acceleration, or agility. Contradictory findings have been reported as the extent of relationship between different speed components. This study comprised 106 professional players who were assessed for 10-m sprint (acceleration), flying 20-m (maximum speed), zigzag agility performance. Although performances in three tests all significantly correlated (p < 0.0005), coefficients...

10.1519/14253.1 article EN The Journal of Strength and Conditioning Research 2005-01-01

Abstract The International Olympic Committee (IOC) recently published a framework on fairness, inclusion, and nondiscrimination the basis of gender identity sex variations. Although we appreciate IOC's recognition role sports science medicine in policy development, disagree with assertion that IOC is consistent existing scientific medical evidence question its recommendations for implementation. Testosterone exposure during male development results physical differences between female bodies;...

10.1111/sms.14581 article EN cc-by-nc Scandinavian Journal of Medicine and Science in Sports 2024-03-01

The purpose of this study was to examine the effects different modes stretching within a pre-exercise warm-up on high-speed motor capacities important soccer performance. Eighteen professional players were tested for countermovement vertical jump, stationary 10-m sprint, flying 20-m and agility performance after warm-ups consisting static stretching, dynamic or no stretching. There significant difference among jump: mean +/- SD data 40.4 4.9 cm (no stretch), 39.4 4.5 (static), 40.2...

10.1519/r-16944.1 article EN The Journal of Strength and Conditioning Research 2006-01-01

High-speed actions are known to impact soccer performance and can be categorized into requiring maximal speed, acceleration, or agility. Contradictory findings have been reported as the extent of relationship between different speed components. This study comprised 106 professional players who were assessed for 10-m sprint (acceleration), flying 20-m (maximum speed), zigzag agility performance. Although performances in three tests all significantly correlated (p < 0.0005), coefficients...

10.1519/00124278-200502000-00013 article EN The Journal of Strength and Conditioning Research 2005-02-01

Human physical capability is influenced by many environmental and genetic factors, it generally accepted that phenotypes are highly polygenic. However, the ways in which relevant polymorphisms combine to influence of individuals populations unknown. Initially, literature was searched identify associations between 23 human endurance phenotypes. Next, typical genotype frequencies those general population were obtained from suitable literature. Using probability calculations, we found only a...

10.1113/jphysiol.2007.141887 article EN The Journal of Physiology 2007-09-28

Recent evidence supports the use of certain soccer drills for combined technical and physical training. Therefore, it is important to be able accurately monitor training intensity during intended development allow optimization parameters. Twenty-eight professional players were assessed heart rate (HR) rating perceived exertion (RPE) responses 5 commonly used (2v2 8v8 drills). The both HR RPE differed significantly (p < 0.05) between drills, generally showing an elevated response involving...

10.1519/r-19445.1 article EN The Journal of Strength and Conditioning Research 2007-01-01

The general consensus among sport and exercise genetics researchers is that genetic tests have no role to play in talent identification or the individualised prescription of training maximise performance. Despite lack evidence, recent years witnessed rise an emerging market direct-to-consumer marketing (DTC) claim be able identify children's athletic talents. Targeted consumers include mainly coaches parents. There concern scientific community current level knowledge being misrepresented for...

10.1136/bjsports-2015-095343 article EN cc-by-nc British Journal of Sports Medicine 2015-11-18

It is generally accepted that muscle fibre composition may influence physical performance. The α-actinin-3 (ACTN3) gene R577X polymorphism suspected to be one of the contributing variations in determination type and athletic status. In present study, we examined dependence average preferred racing distance (PRD) on vastus lateralis 34 subelite Russian speed skaters (20 men 14 women) who competed races different length (500-10,000 m). We also investigated association between ACTN3...

10.1113/expphysiol.2011.060293 article EN Experimental Physiology 2011-09-20

This paper compares four running events (100m, 200m, 400m, 800m) in terms of (a) official in-competition career-best performances nine women with natural variations their sex characteristics known to fall under the World Athletics Eligibility Regulations for Female Classification – Athletes Differences Sex Development (DSD) (b) distribution all those Paris 2024 Olympics both men and women. The analysis shows that, despite not having suppressed testosterone as required compete regulations,...

10.31219/osf.io/axvqz_v1 preprint EN 2025-02-21

Purpose: To examine the relative effectiveness of moderate-intensity continuous training and high-intensity interval on pulmonary O2 uptake (V̇O2) kinetics at onset moderate- severe-intensity cycle exercise in previously sedentary subjects. Methods: Twenty-three healthy subjects (11 males; mean ± SD age 24 5 yr; V̇O2peak 34.3 5.5 mL·kg−1·min−1) were assigned to one three groups: a group that completed four sessions per week 30-min duration 60% (LO); an involving 20 × 1-min bouts 90%...

10.1249/01.mss.0000191418.37709.81 article EN Medicine & Science in Sports & Exercise 2006-03-01

Recent evidence suggests that certain soccer drills produce exercise intensities suitable for physical conditioning. However, it remains debatable whether can provide a sufficiently unified intensity among different players and on repetition of drill, because movement patterns cannot be externally controlled during drills. Good reliability low variability would enable all to receive an appropriate training stimulus. The purpose this study was investigate intersubject intrasubject in It...

10.1519/r-17094.1 article EN The Journal of Strength and Conditioning Research 2006-01-01

Accumulating evidence suggests that athletic performance is strongly influenced by genetic variation. One such locus of influence the gene for angiotensin-I converting enzyme (ACE), which exhibits a common variant [ACE insertion (I)/deletion (D)]. ACE can drive formation vasoconstrictor ANG II but preferentially degrades vasodilator bradykinin. The I allele associated with higher kinin activity. A in β 2 receptor (B R) exists: -9 as opposed to +9 mRNA expression. We tested whether this was...

10.1152/japplphysiol.00865.2003 article EN Journal of Applied Physiology 2004-02-06

Alternative measures of muscle size, strength, and power to those used in previous studies could help resolve the controversy surrounding associations between polymorphisms angiotensin‐ I converting enzyme ( ACE ) α‐actinin‐3 ACTN3 genes skeletal phenotypes, responses resistance training RT ). To this end, we measured quadriceps femoris volume V m ), physiological cross‐sectional area PCSA maximum isometric force F t specific per unit isoinertial strength (1‐ RM W max ; n = 40) before after...

10.1111/sms.12055 article EN Scandinavian Journal of Medicine and Science in Sports 2013-02-05

Studies investigating associations between ACTN3 R577X and ACE I/D genotypes endurance athletic status have been limited by small sample sizes from mixed sport disciplines lack quantitative measures of performance. Aim: To examine the association best personal running times in a large homogeneous cohort runners. We collected total 1064 1500, 3000, 5000 m marathon 698 male female Caucasian athletes six countries (Australia, Greece, Italy, Poland, Russia UK). Athletes were genotyped for ID...

10.1186/s12864-017-4412-0 article EN cc-by BMC Genomics 2018-01-03

10.1016/j.jelekin.2006.04.008 article EN Journal of Electromyography and Kinesiology 2006-06-24

Recent evidence supports the use of certain soccer drills for combined technical and physical training. Therefore, it is important to be able accurately monitor training intensity during intended development allow optimization parameters. Twenty-eight professional players were assessed heart rate (HR) rating perceived exertion (RPE) responses 5 commonly used (2v2 8v8 drills). The both HR RPE differed significantly (p < 0.05) between drills, generally showing an elevated response involving...

10.1519/00124278-200705000-00013 article EN The Journal of Strength and Conditioning Research 2007-05-01

The present study investigated whether in vivo human quadriceps femoris (QF) muscle specific tension changed following strength training by systematically determining QF maximal force and physiological cross-sectional area (PCSA).Seventeen untrained men (20 +/- 2 years) performed high-intensity leg-extension three times a week for 9 weeks. Maximum tendon (F(t)) was calculated from maximum voluntary contraction (MVC) torque, corrected agonist antagonist activation, moment arm length (d(PT))...

10.1111/j.1748-1716.2010.02085.x article EN Acta Physiologica 2010-01-25
Coming Soon ...