title: Whole body vibration at different exposure frequencies: infrared thermography and physiological effects.
abstract: The aim of this study was to investigate the effects of whole body vibration (WBV) on physiological parameters, cutaneous temperature, tactile sensitivity, and balance. Twenty-four healthy adults (25.3 ± 2.6 years) participated in four WBV sessions. They spent 15 minutes on a vibration platform in the vertical mode at four different frequencies (31, 35, 40, and 44 Hz) with 1 mm of amplitude. All variables were measured before and after WBV exposure. Pressure sensation in five anatomical regions and both feet was determined using Von Frey monofilaments. Postural sway was measured using a force plate. Cutaneous temperature was obtained with an infrared camera. WBV influences the discharge of the skin touch-pressure receptors, decreasing sensitivity at all measured frequencies and foot regions (P ≤ 0.05). Regarding balance, no differences were found after 20 minutes of WBV at frequencies of 31 and 35 Hz. At 40 and 44 Hz, participants showed higher anterior-posterior center of pressure (COP) velocity and length. The cutaneous temperature of the lower limbs decreased during and 10 minutes after WBV. WBV decreases touch-pressure sensitivity at all measured frequencies 10 min after exposure. This may be related to the impaired balance at higher frequencies since these variables have a role in maintaining postural stability. Vasoconstriction might explain the decreased lower limb temperature.
authors: Programa de Pós-Graduação em Neurociências, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Sarmento Leite, 500, 90050-170 Porto Alegre, RS, Brazil ; Programa de Pós-Graduação em Ciências da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre, Sarmento Leite, 245, 90050-170 Porto Alegre, RS, Brazil.
authors: Anelise
authors: A
authors: Sonza
authors: Programa de Pós-Graduação em Ciências da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre, Sarmento Leite, 245, 90050-170 Porto Alegre, RS, Brazil.
authors: Caroline C
authors: CC
authors: Robinson
authors: Programa de Pós-Graduação em Neurociências, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Sarmento Leite, 500, 90050-170 Porto Alegre, RS, Brazil ; Departamento de Ciências Morfológicas, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Sarmento Leite, 500, 90050-170 Porto Alegre, RS, Brazil.
authors: Matilde
authors: M
authors: Achaval
authors: Programa de Pós-Graduação em Neurociências, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Sarmento Leite, 500, 90050-170 Porto Alegre, RS, Brazil.
authors: Milton A
authors: MA
authors: Zaro
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007259:Infrared Rays; D008297:Male; D004856:Postural Balance / Q000528:radiation effects; D012881:Skin Temperature / Q000528:radiation effects; D013817:Thermography / Q000379:methods; D014110:Touch / Q000528:radiation effects; D014732:Vibration / Q000009:adverse effects*; D055986:Vital Signs / Q000528:radiation effects