Blood lactate responses to exercise performed on a high-speed inertial device

Abstract

To assess blood lactate and performance variables obtained from high-speed exercise performed on a device (Impulse Training Systems; Newnan GA) that imposes loads without gravitational resistance, subjects (n = 45) completed two tonic and two phasic workouts. Each high-speed workout entailed two 60-second sets of seated knee- and hip-extension repetitions separated by a 90-second rest period. Pre- and five minutes post-exercise, lactate concentration was measured from a fingertip blood drop with a calibrated analyzer (Accusport, Sports Resource Group, Hawthorne, NY). Mean blood lactate values were compared with a 2(contractile mode: tonic, phasic) x 2(time) x 2 (gender) ANOVA, with repeated measures applied to workout mode and time. Resistance exercise performance variables were assessed with 2 (contractile mode: tonic, phasic) x 2 (gender) ANOVAs. With α ≤ 0.05, results showed a time (post > pre) effect for blood lactate. Exercise performance values were impacted by workout mode and gender, yet those independent variables had no impact on blood lactate. Results concur with prior resistance exercise studies that show significant blood lactate increases over time. Additional inquiry is warranted as to why gender and workout mode influenced resistance exercise performance variables, but did not impact blood lactate.