Muscle force recovery in relation to muscle oxygenation

作者：Ufland Pierre^*; Lapole Thomas; Ahmaidi Said; Buchheit Martin

来源：Clinical Physiology and Functional Imaging, 2012, 32(5): 380-387.

DOI：10.1111/j.1475-097X.2012.01141.x

• muscle reoxygenation
• near-infrared spectroscopy
• postexercise recovery
• repeated-effort ability
• Torque recovery

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 MVCs [i.e. a 30-s MVC (MVC30) followed by a 10-s MVC (MVC10)] 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 MVC30 to the end of MVC10. Muscle oxygenation (Near-infrared spectroscopy, NIRS, [Hbdiff]) was continuously measured during all MVC sequences and expressed as a percentage of the maximal changes in optical density observed during MVC30. Maximal Torque was analysed at the start of each contraction. Torque during each MVC10 was expressed as a percentage of the Torque during the previous MVC30. Torque recovery was complete within 300 s after MVC30 during CON (MVC10 = 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.

• 出版日期2012-9