Maximal Lower Extremity Power Output Changes During a Decathlon

Science & Sports, 2015

Aucun changement de puissance maximale des membres inférieurs ne semble être induit par le décathlon

Gait & Posture, 2019

Highlights  Running a 12-km organised race affected neuromuscular measures, confirming fatigue  Peak plantar-flexion strength and postural balance were impaired post 12-km race  Foot-strike, however, was similar pre-race vs post-race and at 3-km vs 10-km  12-km race times were predicted with a high accuracy, but not foot-strike pattern  Results corroborate the value of plantar-flexion strength in racing events

Journal of Strength and Conditioning Research, 2002

Recovery of maximal force and power following a 10-km race has not been widely studied in the scientific literature. Ten healthy men who were experienced distance runners participated in this investigation. Data were collected prerace, immediate postrace, and 48 hours postrace to examine the effect of a 10-km race on muscle force production in the lower body. Maximal peak torque was measured via an isokinetic dynamometer at 30Њ, 180Њ, and 300Њ·s Ϫ1 . A significant (p Յ 0.05) reduction in peak torque for knee flexion was observed at 30Њ·s Ϫ1 immediately postrace. Average power of the knee flexors were significantly decreased immediately postrace. Total work (J) flexion performed over the last 17 repetitions of the 50-repetition test were significantly reduced from baseline values during both the immediate and 48-hour postrace tests. Significant reductions in peak vertical jump force remained reduced 48 hours postrace testing. No changes were observed for jump power after the race. These data indicate that only the hamstring muscle group was not fully recovered to perform the 50-repetition test and that force production in the vertical jump test was compromised 48 hours after a 10-km race. Nevertheless, it appears that strength and power capabilities of the 10-km runner are for the most part restored 48 hours after an all-out 10-km race effort. From a practical perspective, it appears that a minimum of 48 hours should be utilized between multiple trials in 10-km races at track and field meets. mer. The effects of a 10-kilometer run on muscle strength and power.

Sports Medicine - Open, 2021

Maximal muscular power production is of fundamental importance to human functional capacity and feats of performance. Here, we present a synthesis of literature pertaining to physiological systems that limit maximal muscular power during cyclic actions characteristic of locomotor behaviours, and how they adapt to training. Maximal, cyclic muscular power is known to be the main determinant of sprint cycling performance, and therefore we present this synthesis in the context of sprint cycling. Cyclical power is interactively constrained by force-velocity properties (i.e. maximum force and maximum shortening velocity), activation-relaxation kinetics and muscle coordination across the continuum of cycle frequencies, with the relative influence of each factor being frequency dependent. Muscle cross-sectional area and fibre composition appear to be the most prominent properties influencing maximal muscular power and the power-frequency relationship. Due to the role of muscle fibre composi...

BACKGROUND AND OBJECTIVE: The extent to which moderate intensity running or cycling impact subsequent maximal neuromuscular performance is unclear. Thus, the aim of the present study was to evaluate the effect of moderate intensity and volume running and cycling on maximal and explosive muscle strength. METHODS: Ten young physically active men were recruited and had their knee extension isometric peak torque, rate of torque development (RTD), and counter movement jump height measured at baseline (REF) and after moderate intensity 30 min running (RUN) or cycling (CYC). Electromyographic activity of the quadriceps muscles was obtained during the isometric tests. RESULTS: No significant differences were indicated between conditions for isometric peak torque (p > 0.05), RTD (p > 0.05), countermovement jump (p > 0.05), and the electromyographic amplitude (p > 0.05). CONCLUSION: The present data indicate that maximal and explosive lower limb muscle strength is not compromised after 30 minutes of moderate intensity continuous exercise, independent of the mode of the exercise performed. peak torque of endurance athletes. This impairment in 28 the muscular function may influence the quality of a 29 following resistance exercises, probably affecting the 30 muscular adaptations to concurrent training. 31 The exercise protocols used in the aforementioned 32 and other studies, however, are not comparable to the 33 training programs frequently used to develop health 34 and fitness, and in some concurrent training studies. As 35 a rule, health and fitness programs are based on exer-36 cise sessions at submaximal intensities, with short to 37 moderate durations [16], whereas many studies used 38 longer durations at higher work intensities [8,9,11,15, 39 17,18]. Therefore, present knowledge about the effects 40 of moderate intensity and duration endurance exer-41 cise on the neuromuscular system is still conspicuously 42 limited [19,20]. 43 Cycling and running, often employed in endurance 44 and concurrent training, are different not only metabol-45 ically but also mechanically [21,22]. Each may be re-46 sponsible for different effects on the neuromuscular 47 system. In the study by Lepers et al. [15], 1 h of cycling 48 decreased maximal quadriceps strength, but Place et 49 al. [11] observed significant strength reductions only 50 after the 4 th hour of a similar intensity running pro-51 tocol. However, to the best of our knowledge, no sin-52 gle study has compared the acute muscular effects on 53 moderate intensity cycling or running. 54 According to previous studies we speculate that the 55 interference in strength development observed during 56 concurrent training may be a consequence of the acute 57 reduction in muscular performance due to the previ-58 ous endurance exercise [6]. However, the actual impact 59 of moderate intensity and volume cycling and running 60 on acute muscular function remains unknown. There-61 fore, the aim of the present study was (1) to evaluate 62 the effects of a moderate volume and intensity exer-63 cise session on the maximal muscular strength capac-64 ity and (2) to verify whether cycling exercise is more 65 detrimental to subsequent lower limb muscular perfor-66 mance than running exercise at the same relative inten-67 sity. Based on previous studies, it is hypothesized that 68 both running and cycling will reduce muscular perfor-69 mance, but cycling may have a more detrimental effect 70 on quadriceps performance. 71 2. Methods 72 2.1. Subjects 73 Ten young males were recruited for this study 74 (Table 1). All participants were university students 75 File: ies527.tex; BOKCTP/wyn p. 4 4 E.N. Wilhelm et al. / The influence of running and cycling on subsequent maximal muscular performance software Miograph 2.0 and analyzed with a standard 196 Macro in the Microsoft Excel software (Microsoft Cor-197 poration, USA). RTD was defined as the slope of the

Scandinavian Journal of Medicine & Science in Sports, 2021

The aims of the present study were to characterize the mechanical output of final road sprints of an elite sprinter during international competitions in relation to his power‐velocity‐endurance characteristics and to investigate the relationship between this sprint performance and the power produced during preceding phases of the race. The sprinter performed a set of short and long sprints (5 to 15‐s) on a cycle ergometer to determine his maximal power‐velocity‐endurance profile. Based on eleven races, the distribution of power throughout each race, peak and mean power (Ppeak and Pmean) and associated pedaling rates (vPpeak and vPmean) during the final sprint were analyzed. The power‐velocity‐endurance profile of the sprinter indicated that his theoeretical mean maximal power and corresponding optimal pedaling rate ranged from 20.0 W.kg−1 (124 rpm) for a 1‐s sprint to 15.0 W.kg−1 (109 rpm) for 20 s. Race data showed that final road sprints were mainly performed on the ascending limb...

This study investigates associations between power at several durations to show inter- relationships of power across a range of durations in sprint track cyclists. The currently-accepted hypothesis peak power holds a near perfect relationship with sprint performance, and thus a near 1:1 slope with power at sprint durations up to 30-s, is tested. The equally well-accepted and complementary hypothesis there is no strong association with power over longer durations is also tested. 56 data sets from 27 cyclists (21 male, 6 female) provided maximal power for durations from 1-s to 20-min. Peak power values are compared to assess strength of correlation (R2), and any relationship (slope) across every level. R2between 15-s – 30-s power and durations from 1-s to 20-min remained high (R2≥ 0.83). Despite current assumptions around 1-s power, our data shows this relationship is stronger around competition durations, and 1-s power also still shared strong relationships with longer durations out ...

Medicine & Science in Sports & Exercise, 2006

Purpose: The aims of the present study were 1) to analyze whether the KO sprint simulation induced a phenomenon of fatigue of upper and lower limbs and 2) if there was any fatigue, to determine its origin. Methods: Seven elite male skiers were tested before and after a simulation of KO sprints consisting of three 1200-m laps separated by 12 min of recovery. Surface electromyographic activity and force obtained under voluntary and electrically evoked contractions (single twitch) on knee-extensor muscles were analyzed to distinguish neural adaptations from contractile changes. A maximal power output test of the upper limbs was also performed. Results: During the last lap, the final sprint velocity was significantly lower than during the first lap. After the KO sprint, knee-extensor voluntary (j9.8 T 9.5%) and evoked (j16.2 T 11.9%) isometric force and upper-limb power output (j11.0 T 9.3%) and force (j11.3 T 8.7%) significantly decreased, whereas the blood lactate concentration increased to 11.6 mM. On the other hand, no changes were seen in RMS measurement during maximal voluntary contractions, RMS normalized by M-wave amplitude, or M-wave characteristics. Conclusion: Changes in performance, lactate concentration, kneeextensor strength, and upper-limb power indicated that the KO sprint test led the skiers to a state of fatigue. On lower-limb muscles, the decrease of knee-extensor strength was exclusively caused by peripheral fatigue, which was at least in part attributable to a failure of the excitation-contraction coupling.