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Muscle force recovery in relation to muscle oxygenation
Author(s) -
Ufland Pierre,
Lapole Thomas,
Ahmaidi Said,
Buchheit Martin
Publication year - 2012
Publication title -
clinical physiology and functional imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.608
H-Index - 67
eISSN - 1475-097X
pISSN - 1475-0961
DOI - 10.1111/j.1475-097x.2012.01141.x
Subject(s) - medicine , oxygenation , occlusion , contraction (grammar) , cardiology , anesthesia , plantar flexion , repeated measures design , anatomy , ankle , mathematics , statistics
Summary The aim of this study was to investigate the relative contribution of human muscle reoxygenation on force recovery following a maximal voluntary contraction ( MVC ). Ten athletes (22·9 ± 4·0 years) executed a plantar‐flexion sequence including two repeated MVC s [i.e. a 30‐s MVC ( MVC 30 ) followed by a 10‐s MVC ( MVC 10 )] separated by 10, 30, 60, 120 or 300 s of passive recovery. A 10‐min passive recovery period was allowed between each MVC sequence. This procedure was randomly repeated with two different recovery conditions: without ( CON ) or with ( OCC ) arterial occlusion of the medial gastrocnemius. During OCC , the occlusion was maintained from the end of MVC 30 to the end of MVC 10 . Muscle oxygenation (Near‐infrared spectroscopy, NIRS , [Hb diff ]) was continuously measured during all MVC sequences and expressed as a percentage of the maximal changes in optical density observed during MVC 30 . Maximal Torque was analysed at the start of each contraction. Torque during each MVC 10 was expressed as a percentage of the Torque during the previous MVC 30 . Torque recovery was complete within 300 s after MVC 30 during CON ( MVC 10 = 101·8 ± 5·0%); 88·6 ± 8·9% of the Torque was recovered during OCC ( P = 0·005). There was also a moderate correlation between absolute level of muscle oxygenation and Torque ( r = 0·32 (90% CI, 0·09;0·52), P = 0·02). Present findings confirm the role of human muscle oxygenation in muscular force recovery during repeated‐maximal efforts. However, the correlation between absolute muscle oxygenation and force level during recovery is only moderate, suggesting that other mechanisms are likely involved in the force recovery process.