Aim: Passive static stretching (SS), arterial occlusion (C), and the combination of both procedures (SS+C) has been used to stimulate group III and IV afferents of the exercise pressor reflex. However, the effects of dynamic passive stretching (DS) and arterial occlusion (DS+C) on the exercise pressor reflex are not fully elucidated. Therefore, the aim of the present study was to compare central and peripheral response to DS, SS, DS+C, and SS+C. Methods: In twelve healthy volunteers, femoral blood flow (FBF), heart rate (HR), cardiac output (CO), and mean arterial pressure (MAP) were assessed during DS and SS of the quadriceps muscle. The same procedures were repeated with arterial occlusion of lower limb (upper-thigh cuff inflated at 250 mmHg). Results: FBF increased significantly in both DS and SS by 365±98 and 377±102 ml/min. This hyperaemia was ablated during DS+C and SS+C by 11±98 and 5±87ml/min. The increase in HR was similar (~4.2 bpm for DS, SS, DS+C, and SS+C). Likewise, the change in CO was ~0.30 l/min. MAP dropped by -4.7±1.2 and -4±1.4 mmHg during DS and SS, while it increased by 3.7±1.6, and 4.8±1.3 mmHg for DS+C and SS+C. Conclusions: Data from the current study indicated a similar group III afferents response to DS, SS (i.e., equal HR and CO changes). HR and CO findings during DS+C and SS+C suggested no evidence of interaction between group III and IV afferents. Conversely, the MAP reduced only during DS and SS, because of a limb induced-hyperaemia.
Exercise pressor reflex during static and dynamic skeletal muscle stretching / M. Venturelli, E. Cè, E. Limonta, S. Rampichini, A.V. Bisconti, M. Devoto, F. Esposito. ((Intervento presentato al convegno SISMES tenutosi a Padova nel 2015.
Exercise pressor reflex during static and dynamic skeletal muscle stretching
M. VenturelliPrimo
;E. CèSecondo
;E. Limonta;S. Rampichini;A.V. Bisconti;F. EspositoUltimo
2015
Abstract
Aim: Passive static stretching (SS), arterial occlusion (C), and the combination of both procedures (SS+C) has been used to stimulate group III and IV afferents of the exercise pressor reflex. However, the effects of dynamic passive stretching (DS) and arterial occlusion (DS+C) on the exercise pressor reflex are not fully elucidated. Therefore, the aim of the present study was to compare central and peripheral response to DS, SS, DS+C, and SS+C. Methods: In twelve healthy volunteers, femoral blood flow (FBF), heart rate (HR), cardiac output (CO), and mean arterial pressure (MAP) were assessed during DS and SS of the quadriceps muscle. The same procedures were repeated with arterial occlusion of lower limb (upper-thigh cuff inflated at 250 mmHg). Results: FBF increased significantly in both DS and SS by 365±98 and 377±102 ml/min. This hyperaemia was ablated during DS+C and SS+C by 11±98 and 5±87ml/min. The increase in HR was similar (~4.2 bpm for DS, SS, DS+C, and SS+C). Likewise, the change in CO was ~0.30 l/min. MAP dropped by -4.7±1.2 and -4±1.4 mmHg during DS and SS, while it increased by 3.7±1.6, and 4.8±1.3 mmHg for DS+C and SS+C. Conclusions: Data from the current study indicated a similar group III afferents response to DS, SS (i.e., equal HR and CO changes). HR and CO findings during DS+C and SS+C suggested no evidence of interaction between group III and IV afferents. Conversely, the MAP reduced only during DS and SS, because of a limb induced-hyperaemia.Pubblicazioni consigliate
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