Convergent validity of a simplified device and relationship between blood lactate and salivary lactate after a vertical squat jump in healthy non-athletes

  • Okano Satomi
    Graduate School of Medicine, Shinshu University, Japan Department of Physical Therapy, Faculty of Health Sciences, Iryo Sosei University, Japan
  • Nishizawa Hitomi
    School of Health Sciences, Faculty of Medicine, Shinshu University, Japan
  • Yui Joya
    School of Health Sciences, Faculty of Medicine, Shinshu University, Japan
  • Yokokawa Yoshiharu
    School of Health Sciences, Faculty of Medicine, Shinshu University, Japan
  • Koinuma Masayoshi
    Center of Clinical Research, Shinshu University Hospital, Japan Faculty of Pharmaceutical Sciences, Teikyo Heisei University, Japan
  • Nakamura Akinori
    Third Department of Medicine, Shinshu University School of Medicine: 3-1-1 Asahi, Matsumoto, Nagano 390-0802, Japan Department of Clinical Research, National Hospital Organization Matsumoto Medical Center, Japan

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<p> [Purpose] The aims of this study were 1) to examine the convergent validity between Lactate pro 2 and a standard JCA-BM 8000 automatic analyzer using salivary lactate and 2) to investigate the relationship between blood and salivary lactate levels after a vertical squat jump. [Participants and Methods] Healthy non-athletes participated in this observational study. The participants performed a vertical squat jump for 1 min 30 s. Blood and salivary lactate levels were measured before and after exercise using Lactate Pro 2. [Results] The intraclass correlation coefficient between Lactate Pro 2 and the JCA-BM 8000 automatic analyzer was 0.773, which can be considered as substantial convergent validity. However, in some samples, the salivary lactate level was out of the measurable range, and numerical values could not be obtained. The cross-correlation function between the blood and salivary lactate levels was 0.535 at lag 0 and 0.750 at lag 1, which indicated a 5-min lag between the salivary and blood lactate values. [Conclusion] Salivary lactate levels can be easily measured using Lactate Pro 2, although its sensitivity needs to be resolved. Further research is required for salivary lactate level, which can be collected non-invasively, to be used as an alternative parameter to blood lactate level.</p>

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