Recovery of power output and muscle metabolites following 30 s of maximal sprint cycling in man.

Abstract

1. The recovery of power output and muscle metabolites was examined following maximal sprint cycling exercise. Fourteen male subjects performed two 30 s cycle ergometer sprints separated by 1-5, 3 and 6 min of recovery, on three separate occasions. On a fourth occasion eight of the subjects performed only one 30 s sprint and muscle biopsies were obtained during recovery. 2. At the end of the 30 s sprint phosphocreatine (PCr) and ATP contents were 19-7 + 1'2 and 70 5 + 6-5% of the resting values (rest), respectively, while muscle lactate was 119'0 + 4-6 mmol (kg dry wt)-' and muscle pH was 6-72 + 0-06. During recovery, PCr increased rapidly to 65-0 + 2-8% of rest after 1t5 min, but reached only 85-5 + 3 5% of rest after 6 min of recovery. At the same time ATP and muscle pH remained low (19-5 + 0 9 mmol (kg dry wt)-f and 6-79 + 002, respectively). Modelling of the individual PCr resynthesis using a power function curve gave an average half-time forPCr resynthesis of 56 6 + 7.3 s. 3. Recovery of peak power output (PPO), peak pedal speed (maxSp) and mean power during the initial 6 s (MPO6) of sprint 2 did not reach the control values after 6 min of rest, and occurred in parallel with the resynthesis of PCr, despite the low muscle pH. High correlations (r = 0 71-0 86; P < 0 05) were found between the percentage resynthesis of PCr and the percentage restoration of PPO, maxSp and MPO6 after 1-5 and 3 min of recovery. No relationship was observed between muscle pH recovery and power output restoration during sprint 2 (P > 0 05). 4. These data suggest that PCr resynthesis after 30 s of maximal sprint exercise is slower than previously observed after dynamic exercise of longer duration, and PCr resynthesis is important for the recovery of power during repeated bouts of sprint exercise.

The physiological responses to repeated upper-body sprint exercise in highly trained athletes

“…However, possible differences in VO 2 fluctuations across exercise modes needs to examined in future studies. Although many factors influence the concentration of lactate in the blood, the steady increase in blood lactate levels found here may indicate an incomplete resynthesis of PCr and thereby increasing requirements from lactic anaerobic energy together with the aerobic energy sources utilized (Bogdanis et al 1995). Several studies have shown correlations between the decrement in RSA and the decline in intramuscular pH (Glaister 2005;Edge et al 2006).…”

Kinematic, Kinetic, and Blood Lactate Profiles of Continuous and Intraset Rest Loading Schemes

“…It has been previously observed that within two minutes of rest 50% of the depleted intramuscular phosphocreatine stores can be replenished (Bogdanis, Nevill, Lakomy and Boobis, 1998). As the rest periods prescribed between sets of ISRR loading were 130 seconds in duration, it would appear possible that similar repletion rates may have occurred in the current study.…”

Effects of intermittent pneumatic compression vs. neuromuscular electrical stimulation on recovery following anaerobic exercise in male basketball players

“…NMES which uses medium frequency alternating current induces vasodilation & increase peripheral blood flow [46,47] & the suction system with an electrode has a massage effect [27]. Also the rest position during NMES favors the resynthesis of PCr [25]. The calf muscles stimulated in this study are largely responsible for venous return [48] and may have aided a better recovery.…”

“…Low frequency electrical stimulation is the commonly used mode for the recovery process because it induces light muscle contraction responsible for muscle pump effect & therefore enhanced muscle blood flow. NMES also favors the resynthesis of phosphocreatine [25]. In addition, a decrease in heart rate suggests that efficient blood flow stimulation by NMES can alleviate the stress placed on the heart [26].…”