Title

Passive muscle stretching impairs rapid force production and neuromuscular function in human plantar flexors

Document Type

Journal Article

Publication Title

European Journal of Applied Physiology

Publisher

Springer

School

Centre for Exercise and Sports Science Research / School of Medical and Health Sciences

Comments

Originally published as: Trajano, G. S., Seitz, L. B., Nosaka, K., & Blazevich, A. J. (2019). Passive muscle stretching impairs rapid force production and neuromuscular function in human plantar flexors. European Journal of Applied Physiology, 119(11-12), 2673-2684. Original publication available here

Abstract

Purpose: We examined the effect of muscle stretching on the ability to produce rapid torque and the mechanisms underpinning the changes. Methods: Eighteen men performed three conditions: (1) continuous stretch (1 set of 5 min), (2) intermittent stretch (5 sets of 1 min with 15-s inter-stretch interval), and (3) control. Isometric plantar flexor rate of torque development was measured during explosive maximal voluntary contractions (MVC) in the intervals 0–100 ms (RTDV100) and 0–200 ms (RTDV200), and in electrically evoked 0.5-s tetanic contractions (20 Hz, 20 Hz preceded by a doublet and 80 Hz). The rate of EMG rise, electromechanical delay during MVC (EMDV) and during a single twitch contraction (EMDtwitch) were assessed. Results: RTDV200 was decreased (P < 0.05) immediately after continuous (− 15%) and intermittent stretch (− 30%) with no differences between protocols. The rate of torque development during tetanic stimulations was reduced (P < 0.05) immediately after continuous (− 8%) and intermittent stretch (− 10%), when averaged across stimulation frequencies. Lateral gastrocnemius rate of EMG rise was reduced after intermittent stretch (− 27%), and changes in triceps surae rate of EMG rise were correlated with changes in RTDV200 after both continuous (r = 0.64) and intermittent stretch (r = 0.65). EMDV increased immediately (31%) and 15 min (17%) after intermittent stretch and was correlated with changes in RTDV200 (r = − 0.56). EMDtwitch increased immediately after continuous (4%), and immediately (5.4%), 15 min (6.3%), and 30 min after (6.4%) intermittent stretch (P < 0.05). Conclusions: Reductions in the rate of torque development immediately after stretching were associated with both neural and mechanical mechanisms.

DOI

10.1007/s00421-019-04244-0

Share

 
COinS