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Acute Cardiovascular Alterations in Hypertensive Renal Patients During Exercise with Constant Load in the Interdialytic Period

100%

Malfatti C., Ferreira S.

Human Movement

2010

vol. 11

issue 2

157-161

Purpose. The study investigated acute cardiovascular alterations during aerobic exercise in interdialytic phase. Basic procedures. Seven hypertensive men with chronic renal disease (CRD) and seven healthy men (C) were matched according to the age (CRD: 48.5 ± 8.5; C: 45.28 ± 9.3) and body mass index (CRD: 24.2 ± 2.8 kgm-2; C: 26.7 ± 2.7 kgm-2). The exercise was executed on a cycloergometer during 6 minutes at 75% of HRmax and 3 minutes of recovery without load at 55 - 60 rpm. The patients came twice and were controlled only on an occasion at the hospital at 9.00 am. The exercise was performed before and 24 hours after haemodialysis (HD). The blood samples were drawn immediately before and 24 hours after HD for hematocrit and hemoglobin analysis. The statistical difference was verified by the ANOVA and two-tailed unpaired Student's t-test only for p < 0.05. Main findings. After HD, the systolic blood pressure (SBP) shows reduction in the first stage (~14%; p < 0.05) and in the recovery period of exercise (~18%; p < 0.05). A hypotension effect of HD was better observed in the diastolic blood pressure (DBP) from the 5th to 9th min of exercise (~20%; p < 0.05). The HD did not modify biochemical (hematocrit and hemoglobin), physiological (Rest SpO2; rest SBP; rest DBP and VO2max) and body weight parameters. Conclusions. The study showed a significant reduction in blood pressure levels during the exercise, principally in DBP 24 hours after HD, suggesting that exercise executed during this period can induce better tolerance to exercise in dialyzed patients.

Maltodextrin's Effect on the Performance of Elite Mountain Biking Athletes During Simulated Competition and on Power Output at the Ventilatory Threshold

52%

Malfatti C., de Laat E., Soler L., Bronkhorst I., Pacheco C., Funez E., Pavlak J., da Silva L., Osiecki R.

Human Movement

2011

vol. 12

issue 3

232-236

Purpose. To aim of this study was to analyze the effects of maltodextrin supplementation on cardiovascular and performance parameters during simulated Mountain Biking (MTB) competition as well as the cardiorespiratory and blood glucose (BG) response to a maximal test performed in a laboratory on elite MTB athletes. Methods. A total of eight male bikers [age: 28.4 ± 10.6 years; body fat: 9.46 ± 3.76 %; VO2max: 55.31 ± 4.7 mL/kg/min], participated in a double-blind study. The athletes received maltodextrin supplementation (1g/kg) or a placebo (light tangerine juice) 20 min before competition (seven 2 km laps) or before a laboratory maximal test. An incremental exercise test on a cycloergometer was performed to find any alterations in maximal HR, Watts max, VO2max, VEmax, and VO2 at the ventilatory threshold (VT), using a gas exchange analyzer. Comparisons between the simulated competition and laboratory variables (maltodextrin vs. placebo) were made using ANOVA and a two-tailed paired Student's t-test, where p < 0.05 was considered statistically significant. Results. Maltodextrin supplementation reduced 26 s in the mean time spent on completing all laps (Maltodextrin: 9 min and 16 s vs. placebo: 9 min and 35 s; p < 0.05). In laboratory testing, maltodextrin raised BG during exercise (Maltodextrin: 104.1 ± 20.9 mg/dL vs. placebo: 88.2 ± 5.3 mg/dL; p < 0.05), power output at the ventilatory threshold (Maltodextrin: 260.8 ± 12.9 vs. placebo: 150.5 ± 8.7; p < 0.05) but had no effect on cardiorespiratory variables. Conclusion. Maltodextrin was found to enhance athletic performance during MTB competition, showing that it can play an important role in supplementation strategies for these competitors.

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2 Human Movement

1 2011

1 2010

2 Malfatti C.

1 Bronkhorst I.

1 Ferreira S.

1 Funez E.

1 Osiecki R.

1 Pacheco C.

1 Pavlak J.

1 Soler L.

1 da Silva L.

1 de Laat E.

Search results

Acute Cardiovascular Alterations in Hypertensive Renal Patients During Exercise with Constant Load in the Interdialytic Period

Maltodextrin's Effect on the Performance of Elite Mountain Biking Athletes During Simulated Competition and on Power Output at the Ventilatory Threshold