“…Low concentrations of blood lactate during competitive matches of volleyball and tennis (2-3 mmol/L) indicate that energy during the short exercise periods (2-8 s) is mainly supplied by a breakdown of PCr, while aerobic pathways restore the energy sources during the rest periods (15-20 s; 14, 24, 27, 37, 66, 103, 115). The anaerobic-lactic energy production usually becomes more important in soccer (9-11, 36, 82, 124), basketball (32,76,117), ice hockey (4,42,84), and squash (78,85,97,116) because of the longer duration of high-intensity periods and/or the higher percentage of net playing time (Table 1). In blood samples taken after top-flight soccer matches, the lactate concentration averages 4-6 mmol/L, and individual values frequently exceed 10 mmol/L (10; Table 1).…”