Len Parker Simpson

ORCID: 0000-0003-3611-9401
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About
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Research Areas
  • Sports Performance and Training
  • Cardiovascular and exercise physiology
  • Muscle activation and electromyography studies
  • Muscle metabolism and nutrition
  • High Altitude and Hypoxia
  • Respiratory Support and Mechanisms
  • Occupational Health and Performance
  • Early Childhood Education and Development
  • Body Composition Measurement Techniques
  • Lower Extremity Biomechanics and Pathologies
  • Hemodynamic Monitoring and Therapy
  • Children's Physical and Motor Development

University of Edinburgh
2022-2025

University of Kent
2018-2021

English Institute of Sport
2018

University of Exeter
2010-2014

We investigated the influence of hypoxia on asymptote (critical power, CP) and curvature constant (W') hyperbolic power-duration relationship, as measured by both conventional all-out testing procedures. 13 females completed 5 constant-power prediction trials a 3-min test to estimate CP W', in normoxia (N) moderate (H; FiO2=0.13). was significantly reduced compared when estimated (H:132±17 vs. N:175±25 W; P<0.001) methods (H:134±23 N:172±30 P<0.01). The W' not different established...

10.1055/s-0034-1389943 article EN International Journal of Sports Medicine 2014-10-20

ABSTRACT We examined the validity of respiratory compensation point (RCP) in estimating critical power (CP) by determining relative agreement between them following an acute intervention, hypoxia, which reduces RCP and CP. CP were determined normoxia (N: FiO 2 = 0.21) hypoxia (H: 0.13) with converted to a output (W) via linear regression V̇O –time relationship correction for mean response time. lower compared ( p &lt; 0.001), but there was no difference N or H 174 ± 26 vs. 178 30 W; H: 133...

10.1002/ejsc.12291 article EN cc-by European Journal of Sport Science 2025-04-03

Typically, accessing the asymptote (critical power; CP) and curvature constant (W') parameters of hyperbolic power-duration relationship requires multiple constant-power exhaustive-exercise trials spread over several visits. However, more recently single-visit protocols personal power meters have been used. This study investigated practicality using a 2-trial, protocol in providing reliable CP W' estimates.Eight trained cyclists underwent 3- 12-min maximal-exercise single session to derive...

10.1123/ijspp.2016-0371 article EN International Journal of Sports Physiology and Performance 2016-12-05

Body position is known to alter power production and affect cycling performance. The aim of this study was compare mechanical output in two riding positions, calculate the effects on critical (CP) W' estimates. Seven trained cyclists completed three peak efforts fixed-duration trial (3-, 5- 12-min) with their hands brake lever hoods (BLH), or a time (TTP). A repeated-measures analysis variance showed that mean during 5-min significantly different between BLH TTP resulting lower estimate CP,...

10.1080/17461391.2018.1495768 article EN European Journal of Sport Science 2018-07-14

Purpose : To assess the association between W ′ and measures of neuromuscular function relating to capacity skeletal muscle produce force in a group elite cyclists. Methods Twenty-two athletes specializing range disciplines competing internationally volunteered participate. Athletes completed assessments maximum voluntary torque (MVT), activation, isometric contraction measure rate development (RTD). This was followed by assessment peak power output (PPO) 3-, 5-, 12-minute time trials...

10.1123/ijspp.2020-0861 article EN International Journal of Sports Physiology and Performance 2021-04-19

PURPOSE: The 3 min all-out test has significantly expedited the process of determining power asymptote (critical power; CP) and curvature constant (W') hyperbolic power-duration relationship for severe intensity exercise. It was hypothesized that selective glycogen depletion type I II muscle fibres would result in alterations to CP W'. Specifically, a reduction W' with no appreciable impact upon CP, whereas METHODS: Eight physically active males performed cycling on three occasions: control...

10.1249/01.mss.0000402151.32918.e7 article EN Medicine & Science in Sports & Exercise 2011-05-01

PURPOSE: It has been established that a single 3 min all-out cycling test can be used to estimate the power asymptote (critical power; CP) and curvature constant (W[[Unsupported Character - &#900;]]) of hyperbolic power-duration relationship for severe intensity exercise. The CP represents highest work rate does not require expenditure finite capacity denoted by W'; latter is expended at predictable >CP. was hypothesized when exercise performed immediately preceding 3-min <CP (moderate heavy...

10.1249/01.mss.0000384833.10122.78 article EN Medicine & Science in Sports & Exercise 2010-05-01
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