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Revista Brasileira de Medicina do Esporte
On-line version ISSN 1806-9940
OLIVEIRA, João Carlos de et al. Identification of the lactate threshold and the blood glucose threshold in resistance exercise. Rev Bras Med Esporte [online]. 2006, vol.12, n.6, pp. 333-338. ISSN 1806-9940. http://dx.doi.org/10.1590/S1517-86922006000600007.
The purpose of this study was to verify the possibility of identifying the blood glucose threshold (GT) as well as to compare and correlate the GT with the lactate threshold (LT) during resistance exercises. Twelve healthy male volunteers aged 24.4 ± 1.2 years and adapted to resistance training were submitted to an incremental resistance exercise with graded intensities according to their maximal workload (kg) performed for 1 repetition (1RM) on both leg press (LP) and bench press (BP). The intensities applied for each 1 min stage were of 10%, 20%, 25%, 30%, 35%, 40%, 50%, 60%, 70%, 80% and 90% of 1RM, respectively, or until volitional exhaustion. Blood lactate and glucose measurements were done each 2 min rest between each stage (YSI 2300 S). The blood lactate and glucose responses were similar for both exercises. No differences were verified for the relative intensity (% 1RM) at which the inflection point of blood lactate and glucose curves were observed respectively for LP (36.6 ± 1.4% and 32.9 ± 1.5%) and BP (31.2 ± 1.2% and 31.2 ± 1.8%) (p > 0.05). Additionally, a high correlation was verified between LT and GT identified both on LP (r = 0.80) and SR (r = 0.73) (p < 0,05). It was concluded that it is possible to identify the LT and GT on resistance exercises. However, additional studies should investigate the meaning of these thresholds and their validity for exercise evaluation and training prescription.
Keywords : Anaerobic threshold; Blood lactate; Blood glucose; Weight lifting.