[Purpose] This study evaluated effects of a high-intensity linear polarized near-infrared
ray irradiation for mitigation of muscle hypertonia. [Subjects] The subjects were 20
patients with cerebrovascular disease. [Methods] Subjects were randomly allocated to an
intervention or control group. The intervention group received irradiation of the triceps
surae. Passive range of motion and passive resistive joint torque of ankle dorsiflexion
were measured before and after the intervention in knee extended and flexed positions.
[Results] In the knee extended position, the mean changes in passive range of motion were
2.70° and −0.50° in the intervention and control groups, respectively, and the mean
changes in passive resistive joint torque were −1.42 and −0.26 N·m in the intervention and
control groups, respectively. In the knee flexed position, the mean changes in passive
range of motion were 3.70° and 0.70° in the intervention and control groups, respectively,
and the mean changes in passive resistive joint torque were −2.38 and −0.31 N·m in the
intervention and control groups, respectively. In both knee positions, the mean changes in
the two indices were greater in the intervention group than in the control group.
[Conclusion] High-intensity linear polarized near-infrared ray irradiation increases
passive range of motion and decreases passive resistive joint torque.
[Purpose] The purpose of this study was to clarify the influence of high-intensity pulse
irradiation with linear polarized near-infrared rays (HI-LPNR) and stretching on
hypertonia in cerebrovascular disease patients. [Subjects and Methods] The subjects were
40 cerebrovascular disease patients with hypertonia of the ankle joint plantar flexor
muscle. The subjects were randomly allocated to groups undergoing treatment with HI-LPNR
irradiation (HI-LPNR group), stretching (stretching group), HI-LPNR irradiation followed
by stretching (combination group), and control group (10 subjects each). In all groups,
the passive range of motion of ankle dorsiflexion and passive resistive joint torque of
ankle dorsiflexion were measured before and after the specified intervention. [Results]
The changes in passive range of motion, significant increase in the stretching and
combination groups compared with that in the control group. The changes in passive
resistive joint torque, significant decrease in HI-LPNR, stretching, and combination
groups compared with that in the control group. [Conclusion] HI-LPNR irradiation and
stretching has effect of decrease muscle tone. However, combination of HI-LPNR irradiation
and stretching has no multiplier effect.
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