Dynamics of thermographic skin temperature response during squat exercise at two different speeds.
Low intensity resistance training with slow movement and tonic force generation has been shown to create blood flow restriction within muscles that may affect thermoregulation through the skin. We aimed to investigate the influence of two speeds of exercise execution on skin temperature dynamics using infrared thermography. Thirteen active males performed randomly two sessions of squat exercise (normal speed, 1s eccentric/1s concentric phase, 1s; slow speed, 5s eccentric/5s concentric phase, 5s), using ~50% of 1 maximal repetition. Thermal images of ST above muscles quadriceps were recorded at a rate of 0.05Hz before the exercise (to determine basal ST) and for 480s following the initiation of the exercise (to determine the nonsteady-state time course of ST). Results showed that ST changed more slowly during the 5s exercise (p=0.002), whereas the delta (with respect to basal) excursions were similar for the two exercises (p>0.05). In summary, our data provided a detailed nonsteady-state portrait of ST changes following squat exercises executed at two different speeds. These results lay the basis for further investigations entailing the joint use of infrared thermography and Doppler flowmetry to study the events taking place both at the skin and the muscle level during exercises executed at slow speed.
Department of Biomedical Sciences for Health, Università degli Studi di Milano, Italy. Electronic address: damiano.formenti@unimi.it.
Damiano
D
Formenti
Department of Physics, Università degli Studi di Milano, Italy.
Nicola
N
Ludwig
Department of Biomedical Sciences for Health, Università degli Studi di Milano, Italy.
Athos
A
Trecroci
Department of Physics, Università degli Studi di Milano, Italy.
Marco
M
Gargano
Department of Biomedical Sciences for Health, Università degli Studi di Milano, Italy.
Giovanni
G
Michielon
Department of Biomedical Sciences for Health, Università degli Studi di Milano, Italy; Metabolism Research Centre, IRCCS Policlinico San Donato Milanese, Milano, Italy.
Andrea
A
Caumo
Department of Biomedical Sciences for Health, Università degli Studi di Milano, Italy.
Giampietro
G
Alberti
D000328:Adult; D001833:Body Temperature Regulation; D015444:Exercise; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000098:blood supply / Q000502:physiology; D012039:Regional Blood Flow; D055070:Resistance Training / Q000379:methods*; D012867:Skin / Q000098:blood supply*; D012881:Skin Temperature; D013817:Thermography; D055815:Young Adult
Blood flow restriction; Skin blood flow; Skin temperature; Thermal imaging; Thermoregulation