Michael John Hamlin

Michael John Hamlin
Lincoln University New Zealand · Department of Tourism, Sport and Society

PhD (Otago)

About

186
Publications
61,424
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Publications

Publications (186)
Article
Full-text available
Purpose To investigate the effects of 4 weeks high-intensity interval training in hypoxia on aerobic and anaerobic performance of 3-on-3 basketball players. Methods In a randomised controlled trial, 15 female basketballers completed eight 1-h high-intensity training sessions in either normobaric hypoxia (hypoxic group n = 8, altitude 3052 m) or no...
Article
Full-text available
Purpose To investigate the effects of 4 weeks high-intensity interval training in hypoxia on aerobic and anaerobic performance of 3-on-3 basketball players. Methods In a randomised controlled trial, 15 female basketballers completed eight 1-h high-intensity training sessions in either normobaric hypoxia (hypoxic group n = 8, altitude 3052 m) or...
Article
Full-text available
Physical activity (PA) participation was substantially reduced at the start of the COVID-19 pandemic. The purpose of this study was to assess the association between PA, mental health, and wellbeing during and following the easing of COVID-19 restrictions in the United Kingdom (UK) and New Zealand (NZ). In this study, 3363 adults completed online s...
Article
Objectives RugbySmart is a safe tackle technique education programme. Our objective was to identify whether the RugbySmart-recommended safe tackle technique was exhibited by club rugby players and whether tackle-related injuries showed poor tackle technique characteristics. Methods The prospective cohort design enabled 28 senior club based amateur...
Article
Strength training in hypoxia has been shown to enhance hypertrophy and function of skeletal muscle, however, the effects of plyometric training in hypoxia is relatively unknown. Therefore, this study aimed to examine the effects of plyometric training in hypoxia compared to normoxia on body composition, sprint and jump parameters. Twenty-three male...
Article
Full-text available
This study aimed to investigate the physiological consequence of an acute bout of whole body vibration (WBV) combined with wearing a weighted vest (WBV+ WV) compared to WBV or WV alone. Fifty-two elderly volunteers (65.2 ± 3.7 years, mean ± standard deviation (SD)) were randomly allocated into 3 groups: WBV (n= 17, 10 sets of 1 minutes squat exerci...
Article
Full-text available
Strategies implemented worldwide to contain COVID-19 outbreaks varied in severity across different countries, and established a new normal for work and school life (i.e., from home) for many people, reducing opportunities for physical activity. Positive relationships of physical activity with both mental and physical health are well recognised, and...
Article
Full-text available
Objective: Childhood cardiometabolic disease risk (CMD) has been associated with short sleep duration. Its relationship with other aspects of sleep should also be considered, including social jetlag (SJL) which represents the difference between a person's social rhythms and circadian clock. This study investigated whether childhood CMD risk is asso...
Article
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University athletes are unique because they not only have to cope with the normal psycho-physiological stress of training and playing sport, but they also need to accommodate the stress associated with their academic studies along with considerable stress from their social environment. The ability to manage and adapt to stress ultimately helps impr...
Preprint
Strategies implemented worldwide to contain COVID-19 outbreaks varied in severity across different countries, and established a new normal for work and school life (i.e. from home) for many people, reducing opportunities for physical activity. Positive relationships of physical activity with both mental and physical health are well recognised, ther...
Article
Full-text available
Background: A Yoga-asana-based intervention has demonstrated its ability to improve flexibility of individuals, but has not been explored in rugby players. We hypothesized that a structured yoga intervention may have an effect on flexibility and sprint performance in male rugby union players. Methods: It was a controlled trial research design an...
Article
Full-text available
This study aimed to evaluate the effect of elastic tape compared to placebo tape and static stretching on recovery of anaerobic power after intensive exercise in untrained females. Thirty-two untrained female volunteers were randomized into an elastic tape (n= 11), a placebo tape (n = 11) or a stretching group (n =10). Prior to, and for up to 7 day...
Article
Full-text available
Objective The objective of this study was to investigate which anthropometric and physical performance variables characterised players that advanced to professional teams (professionals) and how these variables changed over time, compared to those that did not secure professional contracts (i.e. remained amateurs). Methods Differences in anthropom...
Article
Full-text available
In an attempt to reduce the risk of injury that accompanies poor balance, many strength and conditioning coaches and trainers incorporate balance and postural control training into players’ training regimes. However, relatively few balance interventions involve yoga. Therefore, the purpose of this study was to evaluate the effect of a modified yoga...
Article
Objectives: To assess physical activity (PA), mental health and well-being of adults in the UK, Ireland, New Zealand and Australia during the initial stages of National governments’ Coronavirus disease (COVID-19) containment responses. Design: Observational, cross-sectional Methods: An online survey was disseminated to adults (n = 8,425; 44.5 ± 1...
Presentation
The aim of this study was to investigate whether adding hypoxia to 4 weeks of repeated sprint and high-intensity training improved explosive muscular power, aerobic performance and repeated sprint ability in 3x3 basketball players. Eleven well trained female basketball players, were randomly assigned to a hypoxia (H) (n = 5; age: 20.0 ± 1.6; height...
Article
Background: Low back pain is a common problem in pregnant woman. Elastic tape is an alternative method that may reduce low back pain. Objectives: To compare the effect of elastic tape to placebo tape in the treatment of low back pain in pregnant women. Methods: Forty pregnant women were allocated into two groups: elastic group (n= 20) and plac...
Article
Full-text available
Purpose: To examine the effects of intermittent hypoxic breathing at rest (IHR) or during exercise (IHT) on blood pressure and nitric oxide metabolites (NOx) and hypoxia-inducible factor-1 alpha levels (HIF-1α) over a 6-week period. Methods: 47 hypertensive patients were randomly allocated to three groups: hypertensive control (CON: n = 17; IHR:...
Preprint
Full-text available
Objectives: To assess how the early stages of National governments Coronavirus disease (COVID-19) containment strategies impacted upon the physical activity, mental health and well-being of adults in the UK, Ireland, New Zealand and Australia Design: Observational, cross-sectional Setting: Online survey disseminated in the UK, Ireland, New Zealand...
Article
Full-text available
Background: Arterial stiffness is a reversible precursor to hypertension. However, research is needed to determine the minimum amount of training required before acceptable arterial stiffness measurements are collected by novice operators. Objective: To compare novice vs. experienced operator measurements over a 2-week training period to assess whe...
Article
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Neck strengthening for players in impact sports like rugby is receiving greater attention lately due to postulated associations with head and neck injury and concussion and while research is available on the effectiveness of neck strengthening interventions on professional rugby players, the same research has not been conducted on amateurs who make...
Article
Full-text available
Busbridge, AR, Hamlin, MJ, Jowsey, JA, Vanner, MH, and Olsen, PD. Running demands of provincial women's rugby union matches in New Zealand. J Strength Cond Res XX(X): 000-000, 2020-There has been rapid growth in participation in women's rugby but there is minimal research on the sport. The aim of this study was to increase our knowledge of the runn...
Article
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The benefit of resistance training under hypoxic conditions continues to draw considerable debate. This research explored the optimal degree of hypoxia combined with low-load resistance training which mimics the high-load traditional resistance training under normoxic condition. Thirty-seven male team sport athletes were divided into 3 resistance t...
Article
Takamori, S, Hamlin, MJ, Kieser, DC, King, D, Hume, P, Yamazaki, T, Hachiya, M, and Olsen, PD. Senior club-level rugby union player's positional movement performance using individualized velocity thresholds and accelerometer-derived impacts in matches. J Strength Cond Res XX(X): 000-000, 2020-Game demands of professional rugby union players have be...
Article
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Objectives: Neopterin has been used as a stress marker in team sport athletes, but its use in monitoring stress in hypoxic training requires further investigation. The objective of this study was to determine whether neopterin measures could detect differences between hypoxic and normoxic training stress and whether such levels could predict subseq...
Article
Objective: To determine the associations between cardiorespiratory fitness (CRF) and fatness (overweight-obesity) with cardiometabolic disease risk among preadolescent children. Study design: This cross-sectional study recruited 392 children (50% female, 8-10 years of age). Overweight-obesity was classified according to 2007 World Health Organiz...
Article
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This study aimed to evaluate the prevalence of hypovitaminosis D and the possible risk factors in Thai athletes. This cross-sectional study was conducted in 96 student athletes (73 males, 23 females) at the Institute of Physical Education Udonthani Thailand. Vitamin D (25(OH)D) deficiency (
Article
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Impact statement: Body mass index (BMI) is a common measure of body fatness but overestimates body fat in subjects with high muscle mass. We have developed previously a device named "Lipometer," an alternative way to measure body fatness. We show herein that the Lipometer is able to distinguish more clearly (than the BMI) the large body fat differ...
Article
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With increased professionalism in sport there has been a greater interest in the scientific approach to training and recovery of athletes. Applying appropriate training loads along with adequate recovery, is essential in gaining maximal adaptation in athletes, while minimizing harm such as overreaching, overtraining, injury and illness. Although ap...
Poster
Full-text available
Abstract Impaired balance can result in increased postural sway, particularly in the horizontal plane (anterior-posterior and lateral-medial) [1]. In an attempt to reduce the risk of injury that accompanies poor balance, some strength and conditioning trainers incorporate balance and postural control training into athlete’s exercise routines. Howev...
Conference Paper
Full-text available
Abstract. To be useful, fitness tests need to have adequate reliability (i.e. reproducible results), so that important changes in athlete’s performance can be identified. The aim of this study was to investigate the reliability of the 1.2 shuttle run test (1.2SRT), a novel field test also known as the Bronco test, on young elite rugby players. On t...
Article
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Page 10, Fig. 2: The filled circle labelled "3" was plotted inaccurately and should have been in the "harmful" section of the graph, as shown in the corrected version below.
Article
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This study aimed to investigate the acute effects of different environmental oxygen conditions on shuttle repeated sprint performance in futsal players. Using a counterbalanced design, 16 male university-level futsal players performed 3 sets of shuttle repeated sprints (6 × 10 s) over a 5m distance with 20 s active rest between reps and 5 min activ...
Article
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Background: A dearth of knowledge exists regarding how multiple health behavior changes made within an exercise prescription programme can improve health parameters. This study aimed to analyse the impact of changing diet and increasing exercise on health improvements among exercise prescription patients. Methods: In 2016, a representative sampl...
Article
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Background: While adaptation to hypoxia at natural or simulated altitude has long been used with endurance athletes, it has only recently gained popularity for team-sport athletes. Objective: To analyse the effect of hypoxic interventions on high-intensity intermittent running performance in team-sport athletes. Methods: A systematic literatur...
Conference Paper
Full-text available
Commuting via active travel has been related to lower levels of obesity, diabetes, hypertension, cardiovascular risk factors, increased physical activity levels and an improved ability to maintain healthy weight. The 2015 Bike Score®, 2016 Walk Score® and 2015 Transit Score® comprise a patented, standardised scoring system developed using novel, we...
Presentation
Whether increased flexibility can improve sprint performance, among athletes is debatable. The purpose of this study was to evaluate the effect of an 8-week structured yoga intervention on flexibility and sprint performance of 18 male rugby union players, 19 ± 1.3 years old (mean ± SD). Players were assigned randomly to 2 groups; an experimental gr...
Article
We aimed to investigate the effect of an 8-week low-altitude training block supplemented with intermittent hypoxic training, on blood and performance parameters in soccer players. Forty university-level male soccer players were separated into altitude (n = 20, 825m) or sea level (n = 20, 125m) groups. Before (1-2 days prior) and after (1 and 14 day...
Article
Background: The reportedly beneficial improvements in an athlete's physical performance following altitude training may have merit for individuals struggling to meet physical activity guidelines. Aim: To review the effectiveness of simulated altitude training methodologies at improving cardiovascular health in sedentary and clinical cohorts. Me...
Article
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Plai cream (Zingiber cassumunar Roxb.) has been used as a remedy for release pain and inflammation of musculoskeletal problems. The enhancement of the anti-inflammatory effect of Plai cream by phonoporesis or ultrasound therapy is questionable. The aim of this study was to evaluate the effect of Plai cream combined with ultrasound in the treatment...
Article
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The purpose of this study was to investigate the validity and reliability of the Hexoskin® vest for measuring respiration and heart rate (HR) in elite cyclists during a progressive test to exhaustion. Ten male elite cyclists (age 28.8 ± 12.5 yr, height 179.3 ± 6.0 cm, weight 73.2 ± 9.1 kg, V˙ O2max 60.7 ± 7.8 ml.kg.min mean ± SD) conducted a maxima...
Article
Full-text available
The aim of this study was to investigate the effects of low-load resistance training under hypoxia compared to conventional resistance training. Forty male team sport athletes (20.2 ± 1.7 y, 172.5 ± 5.6 cm, 66.3 ± 9.6 kg) were divided into 4 resistance training groups; normobaric 30%1RM (CT30), normobaric 80%1RM (CT80), hypoxic 30%1RM (HT30), and h...
Article
Full-text available
This study aims to investigate the performance changes in 19 well-trained male rugby players after repeat-sprint training (six sessions of four sets of 5 × 5 s sprints with 25 s and 5 min of active recovery between reps and sets, respectively) in either normobaric hypoxia (HYP; n = 9; FIO2 = 14.5%) or normobaric normoxia (NORM; n = 10; FIO2 = 20.9%...
Article
The purpose of this study was to compare the effect of elastic tape (Kinesio tape) to placebo tape or static stretching on delayed onset muscle soreness. Fifty-one untrained female healthy volunteers were randomly assigned into three groups (n = 17/group), elastic tape, placebo tape and stretching group. Muscle soreness was induced by 4 sets of 25...
Article
Full-text available
Background The global rise in obesity prevalence among children and adolescents has been linked to modifiable lifestyle factors, including lack of physical activity. However, no known meta-analysis has been conducted on the effects of exercise intervention on body composition and cardiometabolic risk factors in overweight and obese adolescents. Obj...
Article
Objectives: The rising incidence of non-communicable diseases in western countries is being driven by poor lifestyle choices, including increasingly inadequate physical activity. The aim of this study was to quantify the effectiveness of a physical activity primary care intervention named the 'Green Prescription' on changes in physical activity le...
Presentation
Full-text available
The 1994 bicycle helmet law had an unintentional negative impact on public health by evoking misperceptions about cycling safety (‘dangerisation’ effect), thereby resulting in fewer individuals gaining the health benefits of cycling. Similar to the helmet law, the Health and Safety at Work Act aims to reduce incidents, accidents and fatalities at w...
Poster
To determine if physical activity enjoyment (PAE) and situational motivation can predict levels of vigorous physical activity (VPA). Assessing adolescents’ levels of amotivation, external regulation, identified regulation and intrinsic motivation within leisure-time physical activity (LTPA) and physical education (PE) was underpinned by the Self-De...
Conference Paper
Many teams and individual athletes prefer to compete at home, thereby benefiting from preparing in familiar surroundings, having easy access to training and coaching staff, close contact with family members and profiting from a positive crowd atmosphere. However there is little empirical evidence to show whether home advantage is beneficial, partic...
Conference Paper
The continued increase in the number of adults suffering from chronic diseases is a major health concern for most countries. The ‘Green Prescription’, New Zealand’s primary-care health initiative has been operating for 16 years, yet its long-term effectiveness on physical activity behavior has not been investigated. PURPOSE: To quantify the effecti...
Article
While the effects of instantaneous, single-bout exposure to hypoxia have been well researched, little is known about the autonomic response during, or as an adaptation to, repeated intermittent hypoxic exposure (IHE) in a sedentary population. Resting heart rate variability (HRV) and exercise capacity was assessed in 16 participants (8 receiving IH...
Article
Full-text available
In the context of enteral feeding in children the influence on growth and the question of fat resorption is of great interest. We, therefore, measured the thickness of subcutaneous body fat in a sample of long-term enterally fed toddlers and healthy controls. In 33 long-term enterally fed toddlers (10 girls, 23 boys) and 275 healthy controls (128 g...
Article
Full-text available
The aim of this study was to investigate whether playing rugby at altitude or after travel (domestic and international) disadvantaged teams. In a retrospective longitudinal study, all matches (n=125) played in the 2012 Super Rugby Competition were analysed for key performance indicators (KPI) from coded game data provided by OPTA sports data compan...
Conference Paper
Full-text available
High intensity or high load is traditional weight training which attempts to improve muscle strength. However this training protocol has reported muscle, ligament and tendon injury in many cases. The aim of this study was to identify the effectiveness of two different resistance-training loads combined with hypoxic training compared to conventional...
Conference Paper
Full-text available
Abstract Low-load high repetition resistance training in combination with vascular occlusion or hypoxia can increase muscle hypertrophy, but the effect of such training on cardiovascular response is less clear. This study aimed to investigate the cardiovascular response to resistance training combined with either hypoxia or venous occlusion.In a ra...
Conference Paper
Full-text available
Abstract Much of the research on altitude training for athletes has focused on haematological variables with inconclusive results. The lack of consistent findings may be due to the dose and forms of altitude training and the iron status of the individual athletes. This research aimed to investigate the effects of natural altitude training supplemen...
Conference Paper
Full-text available
The body weight of New Zealand children continues to increase unabated, resulting in a high prevalence of obesity in our young people ranging from 10% in boys to 11% in girls1. These figures are even worse for Maori (17%) and Pacific children (23%)1. Obesity is associated with a number of health problems in adults but also in children2. Because of...
Conference Paper
Abstract Plai (Zingiber cassumunar ROXB) is a popular herb in Asia used for relieving pain and inflammation in musculoskeletal disorders. There are currently two commercially available Plai creams on the market, a lower cost, but lower concentration cream (7%), and a more expensive but higher concentration brand (14%). Little is known about the eff...
Poster
Full-text available
Objective: To compare the effect of Kinesio tape to a placebo tape or normal static stretching on delayed onset muscle soreness (DOMS). Design: A randomized controlled trial. Methods: Fifty seven untrained healthy volunteers (41.7 ± 8.6 years, mean ± SD) were randomly allocated into 3 groups (n = 19/group), Kinesio tape (KT), Placebo tape (PT) and...
Article
Beyond the randomised controlled trial and BMI – evaluation of effectiveness of through-school nutrition and physical activity programmes - Volume 18 Issue 9 - Elaine Rush, Stephanie McLennan, Victor Obolonkin, Rebecca Cooper, Mike Hamlin