Rebecca Sealey

Concurrent validity and reliability of the Simple Goniometer iPhone app compared with the Universal Goniometer

ABSTRACT Objectives: The aim of this study was to assess the concurrent validity and reliability of the Simple Goniometer (SG) iPhone® app compared to the Universal Goniometer (UG). Design: Within subject comparison design comparing the UG with the SG app. Setting: James Cook University, Townsville, Queensland, Australia. Participants: Thirty-six volunteer participants, with a mean age of 60.6 years (SD 6.2). Interventions: Not applicable. Main outcome measure: Thirty-six participants performed three standing lunges during which the knee joint angle was measured with the SG app and the UG. Results: There were no significant differences in the measures of individual knee joint angles between the UG and the SG app. Pearson correlations of 0.96–0.98 and intraclass correlation coefficients of 0.97–0.99 (95% confidence interval: 0.95–1.00) were recorded for all measures. Using the Bland–Altman method, the standard error of the mean of the differences and the standard deviation of the mean of the differences were low. Conclusion: The measurements from the SG iPhone® app were reliable and possessed concurrent validity for this sample and protocol when compared to the UG.

The effects of air travel on performance measures of elite Australian rugby league players

Abstract The current study explored the effects of short haul air travel within the same country on elite Australian rugby league (RL) players (n=12) during two away and two home games of elite competition. Physiological tests of handgrip strength and leg power were assessed along with psychological tests and perceptions of leg soreness and tiredness on the day before the game (Time 1 and Time 2) and on game day (Time 3). Game statistics of tackles and metres gained were assessed for the games analysed. Significant differences were found for daily analyses of life demands for athletes (DALDA) worse than normal responses at Time 2 (2.50±3.23 vs. 3.50±3.93; P=0.04), Karolinska Sleepiness Scale (KSS) at Time 2 (2.88±1.51 vs. 3.71±1.37; P=0.011) and leg tiredness at Time 3 (3.38±1.66 vs. 2.35±1.70; P=0.004) between home and away games. The analysis of game statistics identified that more metres were gained during home games (83.6±49.1 vs. 63.0±30.1; P=0.02) and more tackles made while playing away (18.4±9.2 vs. 14.3±6.7; P=0.016). The results suggest that short haul air travel without crossing time zones results in symptoms of travel fatigue but does not appear to negatively impact on elite RL players ability to perform strength and power tasks. Different game tactics (attacking vs. defensive) occurred between home and away games however, it is unclear whether travel fatigue or a home advantage (HA) is associated with this finding.

The reliability of lower extremity and thoracic kinematics at various running speeds.

Whilst various studies have examined lower extremity joint kinematics during running, there is limited investigation on joint kinematics at steady-state running and at intensities close to exhaustion. Subsequently, the purpose of this study was to determine whether the reliability of kinematics in the lower extremity and thorax is affected by varying the running speeds during a running economy test. 14 trained and moderately trained runners undertook 2 running economy tests with each test incorporating 3 intensity stages: 70-, 90- and 110% of the second ventilatory threshold, respectively. The participants ran for 10 min during each of the first 2 stages and to exhaustion during the last stage. Kinematics of the ankle, knee, hip, pelvis and thorax were recorded using a 3-dimensional motion analysis system. Intra-class correlation coefficient (ICC), limits of agreement (LOA) and coefficient of variation (CV) were used to calculate reliability. The ICC, LOA and CV of the lower extremity and thoracic kinematic variables ranged from 0.33-0.97, 1.03-1.39 and 2.0-18.6, respectively. Whilst the reliability did vary between the kinematic variables, the majority of results showed minimal within-subject variation and moderate to high reliability. In conclusion, examining thoracic and lower extremity kinematics is useful in determining whether running kinematics is altered with varying running intensities.

A 12-week lifestyle intervention for middle-aged, overweight men who are supporters of local sporting clubs

Abstract Objective: To evaluate the effectiveness of a 12-week lifestyle program for changes in healthy lifestyle knowledge, health perceptions and body composition of middle-aged, overweight men. Methods: A participatory, action-based experimental design was employed with a convenience sample (n = 24) of middle-aged men who were supporters of either a local rugby league or rugby union club. Participants attended an introductory session and baseline testing in week one, participated in once-weekly group circuit exercise and lifestyle education sessions for 10 weeks and attended post-testing and project evaluation in week 12. Results: Fourteen participants completed the project. Healthy lifestyle knowledge did not improve significantly. As a combined group there were significant improvements in both physical and mental components of the SF12 questionnaire and in waist girth. The rugby league cohort achieved significant improvement in the SF12 physical component, weight, BMI and waist girth. The rugby union cohort achieved significant improvement in the SF12 mental component and waist girth. Participants reported a variety of health improvement and lifestyle changes following the project and reported appreciation at the involvement of the sporting club. Conclusions: The men’s lifestyle program resulted in significant improvement in body composition, resulting in a reduction in obesity-related disease risk in some participants.

Identification and reliability of pacing strategies in outrigger canoeing ergometry

This study examined the pacing strategies utilised; and the performance reproducibility during repeated outrigger canoeing ergometer time trials. Trained female outrigger canoeists (N=11) completed four 1000m outrigger canoe ergometer time trials. There was a significant 1.5% improvement in 1000m time in trial four compared to trial one. A fast start strategy was adopted in 36 of the 44 trials (82%) followed by a deceleration during the mid stages. As trials progressed there was an increased adoption of negative pacing (fast finish) between the last two splits, indicating a learning effect of pacing strategy across repeated trials. These results demonstrate that although some performance improvement was evident between the first and fourth time trials, the 1000m outrigger ergometer time trial is a reliable test that may be used as a tool to assist with crew selection and performance monitoring. Further, on account of the variation in pacing strategy noted in the fourth trial, the authors recommend utilising one familiarisation session and one test session when assessing performance such that learning or training adaptations resulting from multiple trials do not impact on results.

The Reliability of VO2peak Determination in Healthy Females during an Incremental Arm Ergometry Test

This study examined the reliability of an incremental arm ergometry (AE) protocol during peak aerobic power (VO2(peak)) determination in healthy females. Fifteen females completed two incremental AE tests to exhaustion, seven to eleven days apart, using a mechanically braked arm ergometer. The initial work rate was 16W and increased by 16W every two minutes until exhaustion. Significant differences between tests were determined by repeated measures ANOVA, and paired t-tests or Wilcoxon signed-rank tests, where appropriate. Reliability was determined by intraclass correlation coefficients (ICC), typical error, coefficient of variation (CV) and measurement bias/ratio and 95% limits of agreement (LOA). Peak cardio-respiratory responses were similar between tests, except for tidal volume (1.95 +/-0.47 vs. 1.81 +/- 0.41 L, P<0.05). Reliability for peak variables was moderate to high (ICC=0.659-0.941; CV< or =10%) while LOA were considerable for most variables including VO2(peak) (LOA=0.57 L.min(-1)). Similar peak cardio-respiratory responses, low CV and moderate-high ICC confirmed the reliability of the current incremental AE protocol to be similar to that of prior reported protocols for VO2(peak) determination. Substantial within-participant variability (LOA) for respiratory rate and tidal volume was common during the AE protocol and possibly reflects the influence of respiratory entrainment on reliability that requires further investigation.

Relationship between employment category and gender on quality of life, physical activity and their barriers and motivators, for full-time university staff

Purpose – There has been considerable interest in worksite health programmes to improve employee health and productivity with programme effectiveness possibly influenced by employment category and gender. The purpose of this paper is to examine the current quality of life (QOL), physical activity (PA) levels, sitting times, and barriers/motivators to undertaking PA between academic and professional, and male and female staff within a university workplace. Design/methodology/approach – Participants (105 males, 192 females, n=297) employed as full-time staff of a regional university completed an online survey with differences between staff categories (academic vs professional) and genders identified via ANCOVA using sitting time and working hours as covariates. Relationships between variables were assessed using Spearmans Rank correlations. Findings – Academic and male staff reported greater working hours (∼7-25 per cent, p<0.05) but similar QOL, seven-day total PA (∼3,600 MET-minutes per week) and sitting...

Body position and cardio-respiratory variables in older people

What effect does body position have on cardio-respiratory variables in active older people? An experimental laboratory study was undertaken measuring heart rate, systolic and diastolic blood pressure and oxygen saturation when 26 active people aged 60 years and over adopted five standardized body positions. Measurements were taken every 2 min over a 10-min period in sitting, right side lying, left side lying, supine and supine with the head 20° below the level of the body. Rate pressure product and mean arterial pressure were calculated. Smoking history, medication use, health conditions and activity level were recorded. Height, weight and body fat were measured. Left and right side lying produced significantly lower diastolic and systolic blood pressure, rate pressure product and mean arterial pressure than supine with the head down. Excluding oxygen saturation mean values for all variables remained within recommended normal limits in all positions. Significant differences in cardio-respiratory variables occur when active older people change body position. Positioning as a treatment intervention appears safe in supine, side lying and sitting for this population. Head down supine position should be adopted with caution.

Planning for sedentary behaviour interventions: office workers' survey and focus group responses

Aims: As sedentary behaviour is becoming more prominent in office-based work environments, this study aimed to explore office workers’ perceptions of sedentary behaviour, explore potential behavioural strategies to reduce sedentary behaviour in the workplace and identify barriers which may hamper behaviour change. Methods: A total of 140 office workers were recruited and surveyed from the same workplace. The survey included questions regarding perceptions of the relationship between sitting time and health. Following the survey, 12 employees also participated in focus groups to identify potential sedentary behaviour intervention strategies and barriers. The responses from the survey and focus groups were thematically analysed. Results: In total, 88% of all participants surveyed agreed that there was a relationship between sitting time and their health. The most prominent theme identified was musculoskeletal complaints followed by general health and weight gain or obesity. The focus groups identified that interventions targeting reducing sitting time should include education, supportive and knowledgeable managers, and a variety of behaviour change strategies to address individual preferences and barriers. Conclusion: Multiple behavioural strategies were identified, which appear to be appropriate for sedentary behaviour change.

Influence of Cycle Ergometer Type and Sex on Assessment of 30-Second Anaerobic Capacity and Power

This study examined the influence of cycle ergometer type and sex on assessment of 30-s anaerobic capacity and power. 41 healthy adults performed a 30-s anaerobic cycle test using a mechanically- (ME) and air-braked (AE) ergometer in a randomised order, approximately 7 days apart. Peak heart rate (HR) and rating of perceived exertion were similar between tests with peak HR greater for females compared to males (187.0 ± 9.1 vs. 180.8 ± 9.9 bpm, p<0.05). Peak power (1 100 ± 330 vs. 802 ± 225 W), mean power (793 ± 223 vs. 587 ± 156 W) and total work (23.8 ± 6.7 vs. 17.6 ± 4.7 kJ) were greater for AE compared to ME (p<0.001) and greater for males compared to females (p<0.001). The mean difference for anaerobic capacity and power between AE and ME were similar for males and females (37-41% vs. 33-35%, p>0.05). Peak lactate was greater for AE compared to ME (16.1 ± 3.4 vs. 14.8 ± 2.9 mmol·L (-1); p<0.05) and greater for males compared to females (16.2 ± 3.5 vs. 14.6 ± 2.7 mmol·L (-1); p<0.05). The current study demonstrated that anaerobic power and capacity were substantially greater when assessed using AE compared to the traditional ME with the difference between ergometer types unaffected by sex. Ergometer type should be considered when comparing anaerobic results across populations and/or studies.