Browsing Sport and physical activity by Publisher "Wolters Kluwer"
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The 30-15 intermittent fitness test: can it predict outcomes in field tests of anaerobic performance?This study determined whether a composite assessment of intermittent fitness could be used to quantify performance in several anaerobic tasks. Fifty-two male recreational athletes (age: 24.3 ± 4.4 years; body mass: 85.1 ± 12.2 kg; height: 180.5 ± 7.0 cm) were recruited from various team sports. Participants completed a battery of field tests to assess sprinting speed (40-m sprint), acceleration ability (10-m sprint), change of direction speed (505 test), anaerobic capacity (300-m shuttle), lower-body power (vertical jump), and repeated-sprint ability and the 30-15 Intermittent Fitness Test to determine the velocity of intermittent fitness (VIFT). Relationships between anaerobic tests and VIFT were quantified via Pearson product-moment correlations, and a 2-predictor model multiple linear regression estimated the predictive relationships between the exercise tests and the VIFT. Multiple linear regression showed that VIFT significantly predicted 56, 51, 44, 36, 12, and 1% of the variance in the 300-m shuttle, repeated sprint, 505- and 40-m sprint, vertical jump, and 10-m sprint tests, respectively. The 2-predictor model determined the 300-m shuttle, and repeated-sprint performance accounted for 67% of the variance in VIFT. These findings highlight that various anaerobic characteristics contribute to the intermittent fitness qualities that are quantified through VIFT. More specifically, these data indicate that VIFT is useful for tracking performance in tasks largely determined by anaerobic capacity, but may not be a good predictor of brief all-out sprinting and jumping efforts.
Efficacy of a multi-component intervention to reduce workplace sedentary behaviour in office workersObjective: To investigate the efficacy of a work-based multicomponent intervention to reduce office workers’ sitting time. Methods: Offices (n=12; 89 workers) were randomised into an 8-week intervention (n=48) incorporating organisational, individual, and environmental elements or control arm. Sitting time, physical activity and cardiometabolic health were measured at baseline and after the intervention. Results: Linear mixed modelling revealed no significant change in workplace sitting time, but changes in workplace prolonged sitting time (-39 min/shift), sit-upright transitions (7.8 per shift) and stepping time (12 min/shift) at follow-up were observed, in favour of the intervention group (p<0.001). Results for cardiometabolic health markers were mixed. Conclusions: This short multicomponent workplace intervention was successful in reducing prolonged sitting and increasing physical activity in the workplace, although total sitting time was not reduced and the impact on cardiometabolic health was minimal.
Relationships between highly skilled golfers’ clubhead velocity and vertical ground reaction force asymmetry during vertical jumps and an isometric mid-thigh pullClubhead velocity (CHV) is a commonly measured variable within golf due to strong associations with increased drive distance. Previous research has revealed significant relationships between CHV and vertical ground reaction force (vGRF) variables during bilateral tasks including a countermovement jump (CMJ), squat jump (SJ), drop jump (DJ) and isometric mid-thigh pull (IMTP). Asymmetries have been linked to performance outcomes in a number of sports, however few studies have assessed asymmetries within golf. The current study, therefore, examined the relationships between CHV and vGRF asymmetries for CMJ positive impulse, SJ positive impulse, DJ positive impulse and IMTP peak force (PF). Furthermore, the level of agreement for asymmetries between protocols were assessed via Kappa coefficients. Fifty highly skilled (handicap ≤5) male golfers attended laboratory and range-based testing sessions. Positive impulse and PF were measured using a dual force platform system, with CHV measured using a TrackMan 3e launch monitor. There was no significant relationship (r = -0.14 to 0.22) between CHV and each of the vGRF asymmetry measures. Of the golfers tested, 26 had a ‘real’ asymmetry in the CMJ, 18 had a ‘real’ asymmetry in the SJ, 25 had a ‘real’ asymmetry in the DJ and 27 had a ‘real’ asymmetry in the IMTP. Kappa coefficients indicated that asymmetries rarely favoured the same limb (k = 0.06 to 0.39) with asymmetries varying for individual golfers between protocols. As such, asymmetries are nether beneficial or detrimental to CHV, but are inherently individual and dependent on the task.