Medical Express

ISSN (print): 2318-8111

ISSN (online): 2358-0429

Author's Articles

3 result(s) for: Paulo Roberto Santos-Silva

Blood lactate and oxygen consumption in soccer players: comparison between different positions on the field

Paulo Roberto Santos-Silva; André Pedrinelli; Júlia Maria D'Andrea Greve


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OBJECTIVE: We hypothesize that in players with better aerobic fitness, lactate production was not inhibited after high-intensity exercise, regardless of the footballer's position on the field.
METHOD: Sixty professional male soccer players performed cardiopulmonary exercise tests on an ergometric treadmill; respiratory gas exchanges were monitored throughout and blood lactate levels at peak effort was measured, using a portable device. The heart rate response was determined by computerized EKG. Training sessions took place over an average of ten hours per week, and the players had 6.8 years of experience in competitive soccer; they were tested a third of way into the season. The positions tested were (centerback, fullback, midfielder and striker).
RESULTS: The following results (mean ± std. dev.) were obtained: (1) peak oxygen consumption of 58.8 ± 4.5; (2), blood peak lactate of 12.3 ± 1.6 mmol.L-1; (3) maximum heart rate of 193 ± 3.3 beats. min-1; (4); oxygen consumption at the second ventilatory threshold of 49.6 ± 5.0 mL. kg-1.min-1; (5); running speed at the second ventilatory threshold of 13.3 ± 0.8 km.h-1; (6) percentage of oxygen consumption in the second ventilatory threshold of 84 ± 6%. There was no correlation between maximum aerobic level vs. peak lactate concentration (r = -0,031; p = 0.812), nor between submaximal aerobic level vs. peak lactate concentration (r = -0.146; p = 0.335) in the positions tested.
CONCLUSION: Better or worse aerobic profiles according to game positions in soccer players do not influence peak lactate levels following high-intensity exercise, and confirms the study hypothesis.

Keywords: training, aerobic and anaerobic exercise, ventilatory threshold, heart rate, cardiopulmonary exercise test.

Running economy in elite soccer and futsal players: differences among positions on the field

Paulo Roberto Santos-Silva; Júlia Maria D´Andrea Greve; André Pedrinelli


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OBJECTIVE: To determine running economy in a large sample of elite soccer and futsal players to obtain benchmarks in different positions.
METHODS: Running Economy is the energy demand at a submaximal running velocity. Players were divided into 6 subgroups. Soccer: defenders, midfielders, and strikers; futsal: defenders, wingers, and pivots. Elite soccer players (n=129) and elite futsal players n=72 performed an incremental running test starting at 8.4 km.h-1 with increments of 1.2 km.h-1 every two minutes on a treadmill until exhaustion. Running Economy was determined by interpolation between ventilatory thresholds 1 and 2 (VT1 and VT2).
RESULTS: Running Economy (measured as was compared between the playing positions in the two team sports. In soccer, running economy was 222.7 (defenders), 227.0 (midfielders), and 219.8 (strikers), respectively. In futsal, the corresponding values were 198.5 (defenders), 196.9 (wingers), and 190.5 (pivots), respectively. We no found significantly differences between the three positions in both sports. The Running Economy of futsal players was 12.5% better than that of soccer players. Running Economy correlated positively with oxygen uptake at VT2 in both sports and in all positions.
CONCLUSION: Futsal players exhibited better Running Economy than soccer players; this should be considered as a factor in the athlete’s training plan.

Keywords: maximal oxygen uptake, ventilatory threshold, oxygen cost, aerobic performance, intermittent exercise.

Walking economy and aerobic power in Parkinson’s disease after endurance exercise training: A pilot study

Júlia Maria D´Andrea Greve; Paulo Roberto Santos-Silva; Danielli S Speciali


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OBJECTIVE: To verify the effect of an endurance exercise program in middle stages of Parkinson’s disease.
METHODS: The patients were two women and seven men with Parkinson’s disease, aged 56 to 74 years, classified at Hoehn and Yahr stages 2 to 2.5. The study was designed as an open long-term pilot trial over three months of supervised treadmill exercise training. Cardiopulmonary exercise test evaluations were performed before the start of the study (test 1) and after three months (test 2). The main outcome measure was walking economy (i.e., the rate of oxygen consumption during gait) measured between VT1 and VT2 speeds and Oxygen consumption (VO2).
RESULTS: No changes (p=0.551) were observed for maximal oxygen uptake (VO2max, 24.6 vs 23.6 between tests. The walking economy was 20% better (p<0.001) after three months of aerobic endurance training (266.7 vs 212.6, pre- vs. post-training); the Cohen’s “d” effect size (ES) was 0.99, a very large effect.
CONCLUSION: Evidence from this pilot study in individuals with Parkinson’s disease suggests that gains in walking economy occurs with a treadmill-training program without gain in aerobic power, but which may positively reduce the energy expenditure of activities of daily living in these patients.

Keywords: physical functioning, ventilatory threshold, maximal oxygen uptake.