Bimodal recovery of quadriceps muscle force within 24 hours after sprint cycling for 30 seconds

Abstract

The aim of the study was to investigate the manifestation of potentiation and fatigue as well as the coexistence of these phenomena at different muscle lengths during a 24-hour period after a sprint cycling for 30 s. Material and methods. Twelve healthy untrained men (mean age 23.6±1.7 years) took part in the experiment. The contractility of quadriceps muscle was studied before (Initial) and 2, 5, 30, 60 min and 24 h after exercise via the electrically evoked contractions at 1, 15, 50 Hz and maximal voluntary contractions at short and long muscle length. Results. 1) In early, fast-recovery phase (within the first 5 min), muscle force evoked by electrical stimulation of 1, 15, 50 Hz was restored at short muscle length, conversely at long length (Initial vs. 5 min: 15 Hz and 50 Hz, both P<0.05), whereas maximal voluntary contraction force was still suppressed at both muscle lengths; 2) in the second phase (from 5 min to 30–60 min), muscle force decreased at low- and high-frequency stimulations and was more expressed at low-frequency stimulation and at short muscle length than that at long length, but the maximum voluntary contraction force recovered to initial; 3) in long-lasting phase (within 24 hours), 15 Hz force was still suppressed at both muscle lengths. Conclusion. A bimodal recovery of contractility of the quadriceps following sprint cycling for 30 s is determined by the concomitant complex interaction of mechanisms enhancing (potentiation) and suppressing (fatigue) contractile potential of the muscle.

The Neuromuscular, Biochemical, and Endocrine Responses to a Single-Session Vs. Double-Session Training Day in Elite Athletes

“…suggests that, at least in part, the decreased jump performance observed immediately post maximal speed training was due to decreased functioning of the contractile mechanisms of the muscle fiber (41) in the presence of the metabolites produced during exercise.…”

Muscle force recovery in relation to muscle oxygenation

“…). This is consistent with the result reported after a 30‐s cycling sprint, where MVC decreased by approximately 15% in the early recovery phase (Skurvydas et al ., ). After 30 s, muscle force capacity recovered in a somewhat linear fashion to be complete within 300 s in the occlusion‐free condition (Fig.…”

Bi-modal recovery of quadriceps femoris muscle function after sustained maximum voluntary contraction at different muscle length

“…The equipment and technique used for measuring force have been previously described in detail (3,5). Briefly, the subject sat upright in the experimental chair with a vertical back support.…”

“…Most often contractility is determined by the coexistence of these factors; however, it is difficult to discriminate among their influences. For instance, after an intense exercise inducing metabolic fatigue, the effect of posttetanic potentiation is hidden (5), whereas, following exercise that causes nonmetabolic fatigue, expression of low-frequency fatigue (LFF), the best characterized type of nonmetabolic fatigue, can be compensated by posttetanic potentiation (3,4).…”