Okano Satomi, Miura Haruka, Sakamoto Mizuki, Nishizawa Hitomi
Department of Physical Therapy, Faculty of Health Sciences, Iryo Sosei University, Japan.
Iida Municipal Hospital, Japan.
J Phys Ther Sci. 2025 Feb;37(2):72-76. doi: 10.1589/jpts.37.72. Epub 2025 Feb 1.
[Purpose] To evaluate the validity of measurement sites for assessing blood lactic acid levels following unilateral upper-limb exercises. [Participants and Methods] Blood lactic acid levels were measured at the fingertips of both hands in 40 healthy young men (mean age 20.9 ± 2.5 years). Measurements were taken before, immediately after, and at 90-s intervals following unilateral upper-limb exercises involving palmar flexion and dorsiflexion of the non-dominant hand. Exercise load was determined through maximum voluntary contraction testing. [Results] No significant differences were found in the average blood lactic acid levels between the fingers at any measurement time point. The peak blood lactic acid level occurred approximately 90 s earlier in the motor limb than in the non-motor limb. [Conclusion] This study found no significant difference in blood lactic acid levels between the motor and non-motor limbs when using fingertip measurements during unilateral upper-limb exercises. Therefore, either fingertip may be a suitable measurement site. However, because the peak lactic acid level in the non-motor limb was delayed by around 90 s, the timing of peak muscle fatigue evaluation in the non-motor limb should be considered.
[目的]评估单侧上肢运动后评估血乳酸水平的测量部位的有效性。[参与者与方法]对40名健康年轻男性（平均年龄20.9±2.5岁）双手指尖进行血乳酸水平测量。在非优势手进行包括掌屈和背屈的单侧上肢运动前、运动后即刻以及运动后每隔90秒进行测量。通过最大自主收缩测试确定运动负荷。[结果]在任何测量时间点，手指间的平均血乳酸水平均未发现显著差异。运动肢体的血乳酸峰值水平比非运动肢体早约90秒出现。[结论]本研究发现，在单侧上肢运动期间使用指尖测量时，运动肢体和非运动肢体的血乳酸水平无显著差异。因此，任一指尖都可能是合适的测量部位。然而，由于非运动肢体的乳酸峰值水平延迟约90秒，应考虑非运动肢体肌肉疲劳峰值评估的时间。
