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https://www.readbyqxmd.com/read/28910543/intra-individual-variability-in-the-sleep-of-senior-and-junior-rugby-league-athletes-during-the-competitive-season
#1
Johnpaul Caia, Shona L Halson, Tannath J Scott, Vincent G Kelly
This study examined the sleep intra-individual variability (IIV) of rugby league athletes across senior and junior levels during one week of the competitive season. Forty-five rugby league athletes across elite senior, sub-elite senior and elite junior levels each wore actigraphy monitors for seven days during the competitive season, and completed a subjective sleep diary each morning upon waking. Linear mixed models were used to assess differences in sleep measures between playing levels. Intra-individual standard deviations for each sleep measure were calculated for each athlete to determine their respective IIV, allowing differences in IIV between groups to be assessed...
September 14, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28855419/protein-ingestion-before-sleep-increases-overnight-muscle-protein-synthesis-rates-in-healthy-older-men-a-randomized-controlled-trial
#2
Imre Wk Kouw, Andrew M Holwerda, Jorn Trommelen, Irene Fleur Kramer, Jacqueline Bastiaanse, Shona L Halson, Will Kwh Wodzig, Lex B Verdijk, Luc Jc van Loon
Background: The loss of skeletal muscle mass with aging has been attributed to the blunted anabolic response to protein intake. Presleep protein ingestion has been suggested as an effective strategy to compensate for such anabolic resistance.Objective: We assessed the efficacy of presleep protein ingestion on dietary protein digestion and absorption kinetics and overnight muscle protein synthesis rates in older men.Methods: In a randomized, double-blind, parallel design, 48 older men (mean ± SEM age: 72 ± 1 y) ingested 40 g casein (PRO40), 20 g casein (PRO20), 20 g casein plus 1...
August 30, 2017: Journal of Nutrition
https://www.readbyqxmd.com/read/28719491/greater-effect-of-east-vs-west-travel-on-jet-lag-sleep-and-team-sport-performance
#3
Peter M Fowler, Wade Knez, Stephen Crowcroft, Amy E Mendham, Joanna Miller, Charlie Sargent, Shona Halson, Rob Duffield
PURPOSE: Determine the recovery timeline of sleep, subjective jet-lag and fatigue, and team-sport physical performance following east and west long-haul travel. METHODS: Ten, physically-trained males underwent testing at 09:00 (AM) and 17:00 (PM) local time on four consecutive days two weeks prior to outbound travel (BASE), and the first four days following 21 h of outbound (WEST) and return (EAST) air travel across eight time-zones between Australia and Qatar. Data collection included performance (countermovement jump [CMJ], 20-m sprint and Yo-Yo Intermittent Recovery level 1 [YYIR1] test) and perceptual (jet-lag, motivation, perceived exertion and physical feeling) measures...
July 17, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28703035/influence-of-body-composition-on-physiological-responses-to-post-exercise-hydrotherapy
#4
Jessica M Stephens, Shona L Halson, Joanna Miller, Gary J Slater, Christopher D Askew
This study examined the influence of body composition on temperature and blood flow responses to post-exercise cold water immersion (CWI), hot water immersion (HWI) and control (CON). Twenty-seven male participants were stratified into three groups: 1) low mass and low fat (LM-LF); 2) high mass and low fat (HM-LF); or 3) high mass and high fat (HM-HF). Experimental trials involved a standardised bout of cycling, maintained until core temperature reached 38.5°C. Participants subsequently completed one of three 15-min recovery interventions (CWI, HWI, or CON)...
July 13, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28585467/do-players-and-staff-sleep-more-during-the-pre-or-competitive-season-of-elite-rugby-league
#5
Johnpaul Caia, Tannath J Scott, Shona L Halson, Vincent G Kelly
This study establishes the sleep behaviour of players and staff during the pre- and competitive seasons of elite rugby league. For seven days during both the pre- and competitive seasons, seven rugby league players and nine full-time staff from one professional Australian rugby league club had their sleep monitored via wrist actigraphy and self-report sleep diaries. Two-way repeated measures analysis of variance determined differences between the pre- and competitive season in players and staff, with effect sizes (ES) used to interpret the practical magnitude of differences...
September 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28536184/pre-sleep-dietary-protein-derived-amino-acids-are-incorporated-in-myofibrillar-protein-during-post-exercise-overnight-recovery
#6
Jorn Trommelen, Imre W K Kouw, Andrew M Holwerda, Tim Snijders, Shona L Halson, Ian Rollo, Lex B Verdijk, Luc J C van Loon
The purpose of this study was to determine the impact of ingesting 30 g casein protein with and without 2 g free leucine prior to sleep on myofibrillar protein synthesis rates during post-exercise overnight recovery. 36 healthy young males performed a single bout of resistance-type exercise in the evening (19:45 h) after a full day of dietary standardization. Thirty min prior to sleep (23:30 h), subjects ingested 30 g intrinsically L-[1-(13)C]-phenylalanine-labeled protein with (PRO+leu, n=12) or without (PRO, n=12) 2 g free leucine, or a noncaloric placebo (PLA, n=12)...
May 23, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28422546/competition-sleep-is-not-compromised-compared-to-habitual-in-elite-australian-footballers
#7
Benita J Lalor, Shona L Halson, Jacquie Tran, Justin G Kemp, Stuart J Cormack
PURPOSE: To assess the impact of match start time and days relative to match compared to the habitual sleep characteristics of elite Australian Football (AF) players. METHODS: 45 elite male AF players were assessed during the pre-season (habitual) and across four home matches during the season. Players wore an activity monitor the night before (-1), night of (0), one night after (+1), and two nights (+2) after each match and completed a self-reported rating of sleep quality...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28385561/a-multifactorial-evaluation-of-illness-risk-factors-in-athletes-preparing-for-the-summer-olympic-games
#8
Michael K Drew, Nicole Vlahovich, David Hughes, Renee Appaneal, Kirsten Peterson, Louise Burke, Bronwen Lundy, Mary Toomey, David Watts, Gregory Lovell, Stephan Praet, Shona Halson, Candice Colbey, Silvia Manzanero, Marijke Welvaert, Nic West, David B Pyne, Gordon Waddington
OBJECTIVES: Illness can disrupt training and competition performance of athletes. Few studies have quantified the relative contribution of the known medical, behavioural and lifestyle risk factors. DESIGN: Cross-sectional. METHODS: Olympic athletes from 11 sports (n=221) were invited to complete questionnaires administered nine months before the Rio 2016 Olympic Games. These included the Depression, Anxiety and Stress Questionnaire (DASS-21), Perceived Stress Scale (PSS), Dispositional Resilience Scale (DRS), Recovery-Stress Questionnaire (REST-Q-52 item), Low Energy in Females Questionnaire (LEAF-Q), a modified Personal and Household Hygiene questionnaire, Epworth Sleepiness Scale, Pittsburgh Sleep Quality Index, and custom-made questionnaires on probiotic usage and travel...
March 21, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28282750/evening-electronic-device-use-the-effects-on-alertness-sleep-and-next-day-physical-performance-in-athletes
#9
Maddison J Jones, Peter Peeling, Brian Dawson, Shona Halson, Joanna Miller, Ian Dunican, Michael Clarke, Carmel Goodman, Peter Eastwood
The aim of the present study was to investigate the influence of different types of tasks performed with or without an electronic device (tablet) on pre-sleep alertness, subsequent sleep quality and next-day athletic performance. Eight highly trained netball players attended a sleep laboratory for pre-sleep testing, polysomnographic sleep monitoring and next-day physical performance testing on 5 separate occasions (1 familiarisation and 4 experimental sessions). For 2 h prior to bedtime, athletes completed cognitively stimulating tasks (puzzles) or passive tasks (reading) with or without a tablet...
February 14, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28250934/team-sport-athletes-perceptions-and-use-of-recovery-strategies-a-mixed-methods-survey-study
#10
Fiona Crowther, Rebecca Sealey, Melissa Crowe, Andrew Edwards, Shona Halson
BACKGROUND: A variety of recovery strategies are used by athletes, although there is currently no research that investigates perceptions and usage of recovery by different competition levels of team sport athletes. METHODS: The recovery techniques used by team sport athletes of different competition levels was investigated by survey. Specifically this study investigated if, when, why and how the following recovery strategies were used: active land-based recovery (ALB), active water-based recovery (AWB), stretching (STR), cold water immersion (CWI) and contrast water therapy (CWT)...
2017: BMC Sports Science, Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28135218/longer-sleep-durations-are-positively-associated-with-finishing-place-during-a-national-multi-day-netball-competition
#11
Laura E Juliff, Shona L Halson, Jeffrey Hebert, Peta L Forsyth, Jeremiah J Peiffer
Sleep is often regarded as the single best recovery strategy available to an athlete, yet little is known about the quality and quantity of sleep in athletes during multi-day competitions. The present study objectively evaluated sleep characteristics of athletes during a national netball tournament. Using wrist actigraphy monitors and sleep diaries 42 netballers from four state teams were monitored for the duration of a tournament (6 days) and 12 days prior in home environments. Significant differences were found between teams based on final competition standings, suggesting enhanced sleep characteristics in athlete's whose team finished higher in the tournament standings...
January 20, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28081034/the-effects-of-the-removal-of-electronic-devices-for-48-hours-on-sleep-in-elite-judo-athletes
#12
Ian C Dunican, David T Martin, Shona L Halson, Reid J Reale, Brian T Dawson, John A Caldwell, Maddison J Jones, Peter R Eastwood
Dunican, IC, Martin, DT, Halson, SL, Reale, RJ, Dawson, BT, Caldwell, JA, Jones, MJ, and Eastwood, PR. The effects of the removal of electronic devices for 48 hours on sleep in elite judo athletes. J Strength Cond Res 31(10): 2832-2839, 2017-This study examined the effects of evening use of electronic devices (i.e., smartphones, etc.) on sleep quality and next-day athletic and cognitive performance in elite judo athletes. Over 6 consecutive days and nights, 23 elite Australian judo athletes were monitored while attending a camp at the Australian Institute of Sport (AIS)...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28031772/the-chronotype-of-elite-athletes
#13
Michele Lastella, Gregory D Roach, Shona L Halson, Charli Sargent
The aims of this study were (i) to compare the chronotype distribution of elite athletes to a young adult population and (ii) to determine if there was a tendency for athletes to select and/or participate in sports which suited their chronotype. A total of 114 elite athletes from five sports (cricket, cycling, hockey, soccer and triathlon) participated in this study. The participants' chronotype, sleepiness, sleep satisfaction and sleep quality were determined using the Horne and Östberg Morningness and Eveningness questionnaire, the Epworth Sleepiness Scale and questions concerning their sleep satisfaction and quality...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/27918654/cold-water-immersion-and-contrast-water-therapy-do-not-improve-short-term-recovery-following-resistance-training
#14
Christos K Argus, James R Broatch, Aaron C Petersen, Remco Polman, David J Bishop, Shona Halson
PURPOSE: An athlete's ability to recover quickly is important when there is limited time between training and competition. As such, recovery strategies are commonly used to expedite the recovery process. The purpose of this study was to determine the effectiveness of both cold water immersion (CWI) and contrast water therapy (CWT) compared to control on short-term recovery (<4h) following a single full-body resistance training session. METHODS: Thirteen males (age, 26 ± 5 years; weight, 79 ± 7 kg; height, 177 ± 5 cm) were assessed for perceptual (fatigue and soreness) and performance measures (maximal voluntary isometric contraction (MVC) of the knee extensors, weighted and unweighted countermovement jumps) prior to and immediately following the training session...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27701967/wearable-technology-for-athletes-information-overload-and-pseudoscience
#15
EDITORIAL
Shona L Halson, Jonathan M Peake, John P Sullivan
No abstract text is available yet for this article.
September 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27643743/resistance-exercise-augments-postprandial-overnight-muscle-protein-synthesis-rates
#16
Jorn Trommelen, Andrew M Holwerda, Imre W K Kouw, Henning Langer, Shona L Halson, Ian Rollo, Lex B Verdijk, Luc J C VAN Loon
INTRODUCTION: We have previously shown that protein ingestion before sleep increases overnight muscle protein synthesis rates. Whether prior exercise further augments the muscle protein synthetic response to presleep protein ingestion remains to be established. OBJECTIVE: This study aimed to assess whether resistance-type exercise performed in the evening increases the overnight muscle protein synthetic response to presleep protein ingestion. METHODS: Twenty-four healthy young men were randomly assigned to ingest 30 g intrinsically L-[1-C]-phenylalanine and L-[1-C]-leucine-labeled casein protein before going to sleep with (PRO + EX, n = 12) or without (PRO, n = 12) prior resistance-type exercise performed in the evening...
December 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27632195/effect-of-compression-socks-worn-between-repeated-maximal-running-bouts
#17
Ned Brophy-Williams, Matthew W Driller, Cecilia M Kitic, James W Fell, Shona L Halson
PURPOSE: To determine the effect of wearing compression socks between repeated running bouts on perceptual, physiological and performance-based parameters. METHODS: Twelve well-trained male runners (mean ± SD; 5km time 19:24 ± 1:19 mm:ss) recorded their perceptions on the efficacy of compression socks for recovery prior to completion of two experimental sessions. Each session consisted of two 5km running time trials (TT1 and TT2) on a treadmill, with a one-hour recovery period between each TT...
September 15, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27584178/protein-ingestion-before-sleep-provides-precursors-for-post-exercise-overnight-de-novo-muscle-protein-synthesis-88-board-4-june-1-9-30-am-11-30-am
#18
Jorn Trommelen, Andrew M Holwerda, Imre W K Kouw, Shona L Halson, Lex B Verdijk, Luc J C van Loon
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27584175/exercise-enhances-the-overnight-muscle-protein-synthetic-response-to-pre-sleep-protein-feeding-in-older-males-85-board-1-june-1-9-30-am-11-30-am
#19
Andrew M Holwerda, Imre W K Kouw, Jorn Trommelen, Shona L Halson, Will K W H Wodzig, Lex B Verdijk, Luc J C van Loon
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27441380/superior-inhibitory-control-and-resistance-to-mental-fatigue-in-professional-road-cyclists
#20
Kristy Martin, Walter Staiano, Paolo Menaspà, Tom Hennessey, Samuele Marcora, Richard Keegan, Kevin G Thompson, David Martin, Shona Halson, Ben Rattray
PURPOSE: Given the important role of the brain in regulating endurance performance, this comparative study sought to determine whether professional road cyclists have superior inhibitory control and resistance to mental fatigue compared to recreational road cyclists. METHODS: After preliminary testing and familiarization, eleven professional and nine recreational road cyclists visited the lab on two occasions to complete a modified incongruent colour-word Stroop task (a cognitive task requiring inhibitory control) for 30 min (mental exertion condition), or an easy cognitive task for 10 min (control condition) in a randomized, counterbalanced cross-over order...
2016: PloS One
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