Journal of science and medicine in sport
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Randomized Controlled Trial
Effects of resistance training combined with moderate-intensity endurance or low-volume high-intensity interval exercise on cardiovascular risk factors in patients with coronary artery disease.
To determine the effects of resistance training combined with either moderate-intensity endurance or low-volume high-intensity interval training on cardiovascular risk profiles in patients with coronary artery disease. ⋯ Findings from our pilot study suggest improvements in fitness occur within the first few months of training in patients with coronary artery disease, after which the addition of resistance training to moderate-intensity endurance and high-intensity interval exercise elicited no further improvements. Given the importance of resistance training in cardiac rehabilitation, additional research is required to determine its effectiveness when combined with high-intensity interval exercise.
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Randomized Controlled Trial
Breaking up prolonged sitting with light-intensity walking improves postprandial glycemia, but breaking up sitting with standing does not.
To explore the effects of breaking up prolonged sitting time with standing or light-intensity walking on a range of cardiometabolic risk markers. ⋯ This study suggests that interrupting sitting time with frequent brief bouts of light-intensity activity, but not standing, imparts beneficial postprandial responses that may enhance cardiometabolic health. These findings may have importance in the design of effective interventions to reduce cardiometabolic disease risk.
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Randomized Controlled Trial
Is the six-minute walk test appropriate for detecting changes in cardiorespiratory fitness in healthy elderly men?
The purpose of this study was to determine whether the six-minute walk test (6-MWT) can detect changes in cardiorespiratory fitness (CRF) induced by exercise training in healthy elderly men. ⋯ The 6-MWT is not appropriate to evaluate changes in CRF in healthy elderly men who performed endurance and concurrent training for 24 weeks.
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Randomized Controlled Trial
Effects of wearing compression garments on physiological and performance measures in a simulated game-specific circuit for netball.
This study combined compression garments and Global Positioning System (GPS) tracking to examine the effects on key physiological and performance measures in a simulated game-specific circuit for netball. Compression garments have anecdotal and research supported evidence of enhancing exercise performance. However, the absence of sport specificity warrants further investigation. ⋯ Analysis of effect sizes however, showed greater distances traveled at a faster velocity (3.5ms(-1)) using compression garments in comparison to control and placebo garments (Cohen's d=0.86). Using traditional statistical analysis, performance enhancing effects of compression garments were minimal. However, results of effect sizes analyses showed repeated performances at high speeds were improved in this sample of well-trained netball players.
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Randomized Controlled Trial Clinical Trial
Effect of an acute beta-adrenergic blockade on the blood glucose response during lactate minimum test.
The aim of this study was to determine the relationship between blood lactate and glucose during an incremental test after exercise induced lactic acidosis, under normal and acute beta-adrenergic blockade. Eight fit males (cyclists or triathletes) performed a protocol to determine the intensity corresponding to the individual equilibrium point between lactate entry and removal from the blood (incremental test after exercise induced lactic acidosis), determined from the blood lactate (Lacmin) and glucose (Glucmin) response. This protocol was performed twice in a double-blind randomized order by ingesting either propranolol (80 mg) or a placebo (dextrose), 120 min prior to the test. ⋯ The exercise intensity at Lacmin was lowered (p < 0.05) from 212.1 +/- 17.4 to 181.0 +/- 15.6 W and heart rate at Lacmin was reduced (p < 0 .01) from 161.2 +/- 8.4 to 129.3 +/- 6.2 beats min(-1) as a result of the blockade. It was not possible to determine the exercise intensity corresponding to Glucmin with beta-adrenergic blockade, since the blood glucose concentration presented a continuous decrease during the incremental test. We concluded that the similar pattern response of blood lactate and glucose during an incremental test after exercise induced lactic acidosis, is not present during beta-adrenergic blockade suggesting that, at least in part, this behavior depends upon adrenergic stimulation.