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Onset and recovery of muscle hemodynamic and contractile properties of males and females following a submaximal isometric contraction
Author(s) -
Crenshaw Albert Guy,
Pettersson Linda,
Johnson Pete
Publication year - 2012
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.26.1_supplement.1078.10
Subject(s) - isometric exercise , hemodynamics , contraction (grammar) , forearm , blood flow , medicine , cardiology , anatomy , chemistry , anesthesia
Electrical stimulation determined contractile properties and near infrared spectroscopy determined hemodynamics of the forearm extensor carpi ulnaris muscle of 7 males (M) and 7 females (F) before (pre) and after (immediate – post0, 30 min – post30, and 60 min – post60) a 12‐min isometric contraction at 15% MVC. Contractile data entailed twitch force (Force), contraction time (CT) and ½ relaxation time (½Rx). Hemodynamic data, generated with upper arm venous occlusion (50 mmHg for 1 min), consisted of slopes calculated for total hemoglobin (HbT) and deoxyhemoglobin (Hb) as estimates of blood flow and oxygen consumption. Data are below with * indicating significant differences compared to pre (†–higher than pre for ½Rx and lower for Hbslope).pre post0 post30 post60Force (N)M 2.89 (1.2) 2.82 (1.1)* 2.64 (1.1)* 2.84 (1.3)* F 1.39 (0.3) 1.31 (0.3)* 1.28 (0.5)* 1.37 (0.4)*CT (ms)M 58.34 (8.3) 55.69 (9.4)* 57.71 (9.5)* 58.33 (8.2)* F 57.16 (2.7) 54.38 (3.4) 56.27 (2.6) 57.41 (2.8)½Rx (ms)M 44.77 (8.8) 41.68 (8.5)* 42.48 (8.0)* 45.36 (8.7) †F 57.19 (10) 51.75 (9.2)* 53.90 (8.2)* 56.45 (9.3)*HbTslope (% • s − 1 )M 0.31 (0.1) 0.36 (0.1)* 0.30 (0.1) 0.29 (0.1) F 0.27 (0.1) 0.30 (0.1)* 0.30 (0.1) 0.28 (0.1)Hbslope, (% • s − 1 )M 0.21 (0.1) 0.25 (0.1)* 0.19 (0.1) † 0.21 (0.1) †F 0.18 (0.1) 0.20 (0.1)* 0.18 (0.1)* 0.17 (0.1) †Prolonged changes in contractile data combined with a quicker recovery of hemodynamics suggest low frequency fatigue.