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Effects of oral L-arginine supplementation on vasodilation and O2max in male soccer players

100%

Yaman H., Tiryaki- Sönmez G., Gürel K.

Biomedical Human Kinetics

2010

vol. 2

25-29

Study aim: To determine the effects of oral L-arginine supplementation on vasodilation, blood flow and maximum oxygen uptake (O2max) in soccer players.Material and methods: A group of 24 healthy male soccer players aged 20 - 26 years volunteered to participate in the study. The subjects were randomly assigned into 3 groups: experimental, placebo and control. Experimental group was given L-arginine (6 g orally) and the placebo group - starch (6 g orally) daily for a week; subjects from the control group remained untreated. Before the test and at the end of the week blood samples were collected, and systemic blood pressures, blood flows and maximal oxygen uptake (O2max, by Queens College step test) were recorded. Blood samples were assayed for HDL, LDL, triglyceride and urea concentrations. The study was conducted in a randomised, single-blinded, placebo-controlled fashion consisting of 7-day treatment periods.Results: Oral supplementation of L-arginine significantly (p<0.01) decreased blood pressure indices and increased O2max (p<0.01), blood flow (p<0.05), femoral artery diameter (p<0.05) and urea levels (p<0.05). There was no change in blood lipid levels (p<0.05). No significant changes were noted in the placebo and control groups.Conclusions: Oral supplementation of L-arginine may have beneficial effect on vasodilation and O2max, therefore may increase the exercise capacity of soccer players.

Association between submaximal and maximal measures of aerobic power in female adolescents

100%

Nikolaïdis P.

Biomedical Human Kinetics

2011

vol. 3

106-110

Study aim: To examine the association between two submaximal (physical working capacity at a heart rate of 170 (PWC170) on cycle ergometer test and YMCA Step Test) and maximal measures (maximal oxygen uptake (VO2max)) of aerobic power, as well as to study the repeatability of the aforementioned submaximal measures in physically active female adolescents.Material and methods: Ten female adolescents, aged 13.4 ± 0.7 years old, all members of a local track and field sport club, performed the PWC170 and YMCA Step Test twice. The tests were separated by an interval of one week. During the second laboratory visit, VO2max was measured during a graded exercise test.Results: Considering the repeatability of submaximal measures, intraclass correlation coefficient was 0.89 (95% CI 0.55-0.97) and 0.91 (95% CI 0.65-0.98) in absolute and relative to body mass values of PWC170, while it was 0.69 (95% CI -0.27-0.92) with regard to heart rate at the end of step test and 0.78 (95% CI 0.11-0.95) at the end of the first minute of recovery after step test. PWC170 was associated significantly with VO2max in absolute values (r = 0.65, p = 0.04), but not with VO2max relative to body mass values (r = 0.44, p = 0.20). The corresponding relationships between relative PWC170 and VO2max were r = 0.39 (p = 0.27) and r = 0.60 (p = 0.06). Heart rate at the end of the step test was non-significantly related to VO2max in both absolute and relative values (r = -0.53, p = 0.12 and r = -0.61, p = 0.06), whereas respective values of heart rate at the end of the first minute after step test were r = -0.72 (p = 0.02) and r = -0.69 (p = 0.03).Conclusion: These submaximal measures appeared to be valid and reliable, and they were recommended for further use in similar population with the assumption that a familiarization session was preceded.

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2 Biomedical Human Kinetics

1 2011

1 2010

1 Gürel K.

1 Nikolaïdis P.

1 Tiryaki- Sönmez G.

1 Yaman H.

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Effects of oral L-arginine supplementation on vasodilation and O2max in male soccer players

Association between submaximal and maximal measures of aerobic power in female adolescents