BACKGROUND:Toe flexor muscles (TFMs) play a critical role in ballet, contributing to stability and force transmission during pointe work and jumps. However, traditional training may not provide sufficient stimuli to maintain or improve TFM strength. This randomized controlled trial examined the effects of two targeted toe flexor training interventions on TFM strength and jump performance in adolescent ballet dancers. METHODS:Forty-nine full-time vocational ballet students (age: 16.0 ± 1.2 years) were randomized into three groups (1:1:1). All students continued their regular dance and supplementary conditioning training. In addition, Group 1 performed foot-specific resistance training with a toe flexion device, Group 2 performed single-leg heel rises on an inclined board, and Group 3 served as controls. The 6.5-week intervention assessed maximal voluntary isometric contraction (MVIC) of the TFMs (primary outcome), with horizontal and vertical jump performance as secondary outcomes. RESULTS:Repeated-measures ANOVA revealed significant Group × Time interactions for all toe flexor strength outcomes (P < .001). Group 1 improved TFM strength by 15% to 16% (P < .001), exceeding minimal detectable change thresholds. Group 2 showed no meaningful change, while the control group exhibited a small but significant decline on the right side (P = .046). Horizontal jump performance improved across groups, with the largest effects in Group 1 (r = .82), though between-group differences were non-significant. Vertical jump outcomes showed minor, inconsistent improvements with no clear group advantage. DISCUSSION:These findings indicate that a short-duration, device-based foot training program can elicit meaningful gains in TFM strength and support functional performance. In contrast, dance training and general conditioning alone may be insufficient to preserve toe flexor capacity during periods of intensive training. Specific loading appears essential for maintaining foot strength in this population. This study highlights the potential of targeted, progressively loaded foot exercises for maintaining or improving foot strength in young dancers.

The purpose of this exploratory data analysis was to identify performance predictors of the bobsleigh push phase and to evaluate their importance and effect on performance. Fifty-three predictor variables were derived from a large dataset containing kinematic and joint kinetic variables of 305 ground contact phases (GC) of 28 male elite bobsleigh athletes, which were input to a Random Forest regressor (RF) to predict average forward acceleration. The push phase was divided into a start acceleration (SAP1: first GC after the push-off from the start-block; SAP2: second GC) and acceleration phase (AP: GC at 10 m) to account for phase-specific differences. Recursive feature elimination was employed to increase model accuracy and reduce complexity. Predictor importance measures (IMP) were quantified as the mean change in test error. The RF consistently performed well in explaining differences in acceleration (SAP1: 67%, SAP2: 60%, AP: 60%). The angle of attack was ranked as the top performance predictor across the push phases (IMP: 0.75-1.1) highlighting the importance of whole-body forward orientation for acceleration. The hip angular impulse was positively associated with performance during SAP1 (IMP: 0.4) and SAP2 (IMP: 0.5), which accentuates the importance of strong hip extensors for resisted acceleration.

Technical ability of force application (sagittal force vector orientation) is considered a performance determinant in sprint acceleration, yet the underlying kinematics require further investigation. Sixteen elite male bobsleigh athletes performed unresisted and resisted (85 kg sled push) accelerations initiated with full effort, while ground reaction forces and kinematics were recorded for ground contacts 1 to 5. Ratio of forces (RF), body position, centre of mass velocity components, and lower limb segment rotations were examined for correlations and differences between acceleration tasks. RF was significantly associated with body position (unresisted: r = .82, p < .001; resisted: r = .83, p < .001) and extensional velocity components (unresisted: r = .83, p < .001; resisted: r = .90, p < .001). There was also a significant correlation between body position and extensional velocity component (unresisted: r = .98, p < .001; resisted: r = .84, p < .001) regardless of acceleration task. Shank orientation significantly explained variance in body position (unresisted: adj. R2 = .86, p < .001; resisted: adj. R2 = .81, p < .001). Resisted acceleration provoked greater RF and forward orientations as well as higher shares of extensional velocity components. To improve technical ability, practitioners should focus on manipulating body position to increase the extensional velocity component as well as on shank segment rotation in preparation for the ground contact phase.

The assessment of passive metatarsophalangeal joint (MPJ) quasi-stiffness is of growing importance for both athletic performance optimization and clinical monitoring in patient populations. To deepen our understanding and facilitate broader data collection, there is a need to develop a portable device for measuring passive MPJ quasi-stiffness that can be employed in training facilities and clinical settings. Therefore, we designed a portable, pneumatically driven test device to determine the passive quasi-stiffness of the MPJ. The aim of the present study was to investigate the within-day and between-day test-retest reliability of the device. A total of 19 healthy subjects participated in the study. Passive MPJ quasi-stiffness was assessed at three time points: two measurements were conducted on the same day (within-day reliability), and a third measurement was performed on a different day within the same week (between-day reliability). A standardized protocol ensured identical conditions across all three test sessions. The results of the intra-rater intraclass correlation coefficient (ICC (3,1)) comparing passive MPJ quasi-stiffness indicated excellent test-retest reliability for both within-day measurements (ICC = 0.999, 95% CI: 0.99-0.99, p < 0.001) and between-day measurements (ICC = 0.993, 95% CI: 0.98-0.99, p < 0.001). Bland-Altman analysis revealed minimal systematic bias. These findings demonstrate that the standardized protocol and the custom-made device used in this study provide highly reliable results. Its portability, combined with its ease of use and reliability, makes it highly practical for sports and in clinical settings.

INTRODUCTION:Ulcer formation poses a serious clinical problem and has been associated with muscle function and tissue loss in diabetic feet and increased plantar peak pressures during walking. Reduced intrinsic and extrinsic foot muscle strength has been considered to increase the plantar peak pressure at the most affected metatarsal region. We aimed to investigate if a targeted strength training of the toe flexor muscles 1) enhances muscle strength and volume in the diabetic foot, and 2) improves plantar pressure distribution during walking in diabetic patients. RESEARCH DESIGN AND METHODS:Fourteen non-ulcerated diabetic patients performed a monitored toe flexor strength training at 70% of the maximal voluntary isometric contraction on a custom-made dynamometer for eight weeks. The maximal plantarflexion moment at the metatarsophalangeal joints on the dynamometer, the intrinsic foot muscle volume and the plantar pressure distribution during walking were quantified before and after the intervention. RESULTS:Right and left maximal plantarflexion moments increased significantly by 62% (p < 0.001) and 49% (p < 0.001), the intrinsic muscle volume increased by 6.4% (p = 0.018) and the peak pressures decreased at the second (p < 0.001) and lateral (p < 0.01) metatarsal region each by 11% following the training. CONCLUSIONS:Muscle function and tissue loss in diabetic feet can be counteracted by a targeted strength training program. Improved toe flexor muscle strength reduces plantar peak pressure at common ulceration sites.

This cross-sectional study assessed the associations between anthropometry, isometric maximal strength and rapid force production, and exercise economy (EE) in male and female police officers. Thirty-six male and 27 female German police officers (age 30.2 +/- 5.8 years, estimated V(center dot)o2peak 42.4 +/- 4.5 mlmin(-1)kg(-1)) completed an anthropometric assessment (body height, mass, and composition) followed by isometric maximal (leg press, upright pull, hand grip) and dynamic strength assessment (countermovement jump [CMJ], squat jump [SJ], and drop jump height) and an incremental treadmill test (1.6 + 0.4 ms(-1) every 5 minutes) to determine EE and speed corresponding to 4 mmolL-1 (V4). Isometric maximal strength did not correlate statistically with EE or V4 (-0.31 < r < 0.30, p > 0.05), whereas CMJ (22.4 +/- 4.0 cm) was statistically correlated with EE at 1.6 ms(-1) (46.1 +/- 3.3 mlmin-1kg(-0.75)) and SJ (20.9 +/- 4.3 cm) with EE at 1.6 and 2.0 ms(-1) (74.2 +/- 5.7 mlmin(-1)kg(-0.75)), only in females (r > 0.41, p < 0.05). Fat mass (14.4 +/- 5.2 kg) and age (29.6 +/- 5.8 years) were statistically correlated with V4 in males (3.1 +/- 0.4 ms(-1)) and females (2.8 +/- 0.3 ms(-1)), respectively (r < -0.54, p < 0.01), whereas lean mass (49.8 +/- 4.1 kg) was statistically correlated with EE at 2.4 ms(-1) (86.0 +/- 5.0 mlmin(-1)kg(-0.75)) in females only (r = 0.57, p < 0.01). Higher maximal strength and rapid force production were not associated with better walking or running EE or aerobic performance in male and female police officers.

Background: Toe flexor strength, which involves the combined activation of plantar intrinsic and extrinsic foot muscles, is crucial for locomotion, balance, and performance. Strong toe flexors are particularly crucial for efficient propulsion during running and jumping. Therefore, strengthening the feet has gained increased attention in the general population, as well as among athletes and dancers. However, accurately assessing foot muscle strength remains challenging. This study investigated the within- and between-session reliability of toe flexor maximal voluntary isometric contraction (MVIC) using a custom-made dynamometer. Method: Twenty-five vocational ballet students (23 females and two males; age: 16.48 ± 1.2 years; mass: 53.06 ± 8.84 kg; height: 167.14 ± 6.4 cm; forefoot length: 6.55 ± 0.44 cm) participated in two data collection sessions 48 to 72 hours apart with three trials each session. The toes were positioned at a 25° dorsiflexion angle on the dynamometer. Results: Between-session reliability showed good to excellent intraclass correlation coefficient (ICC) values for absolute MVIC (aMVIC) of the right and left foot (ICC = 0.89-0.95; 95% CI: 0.75-0.96; coefficient of variation [CV]: 4.63-6.45). Toe flexor strength normalized to forefoot length and body weight (rTFS) was excellent for both feet (ICC = 0.91-0.95; 95% CI: 0.79-0.98; CV: 4.8-6.4). The minimal detectable change (MDC) ranged from 9.7% to 13.7% of individual scores. Within-session ICC values ranged from 0.92 to 0.95 (95% CI: 0.70-0.98), indicating excellent reliability across all measures. Discussion: Based on these findings, we recommend conducting at least one familiarization session and three trials per session to reduce the variability in toe flexor muscle strength measurements. The toe flexor dynamometer shows great potential for future research on toe flexor muscle strength in dancers, as well as monitoring back-to-stage rehabilitation progress and assessing pointe readiness.

The purpose of this work was to provide a fundamental, in-depth analysis of kinematics and kinetics of the bobsleigh push phase to establish a basis for performance analysis and enhancement. Fifteen elite male athletes performed maximal effort push starts, while ground reaction forces (GRF) and 3D marker trajectories were simultaneously recorded for ground contacts of different sub-sections of the push phase (start acceleration phase: first and second ground contact after the initial push-off from the start block, acceleration phase: 10 m and high-velocity phase: 30 m). To obtain a comprehensive view of the push phase, whole-body kinematics as well as joint kinetics were analysed and compared across the push phase. The results showed that propulsion during the start acceleration was hip extensor dominant. With increasing running speed, the contribution to propulsion increased at the ankle and decreased at the knee. In contrast to unresisted sprinting, bobsleigh athletes relied more on mechanical energy generation at the hip than at the ankle, especially during start acceleration. These findings should be considered for the strength and conditioning of bobsleigh athletes and further investigated in relation to a suitable performance measure.

We investigated the ecological validity of an inertial measurement unit (IMU) (Vmaxpro) to assess the movement velocity (MV) during a 1-repetition maximum (1RM) test and for the prediction of load-velocity (L-V) variables, as well as the ecological intra- day and inter-day reliability during free-weight bench press (BP) and squat (SQ). Furthermore, we provide recommendations for the practical use of the sensor. Twenty-three strength-trained men completed an incremental 1RM test, whereas seventeen men further participated in another 3 sessions consisting of 3 repetitions with 4 different loads (30, 50, 70 and 90% of 1RM) to assess validity and intra- and inter-day reliability, respectively. The MV was assessed using the Vmaxpro and a 3D motion capture system (MoCap). L-V variables and the 1RM were calculated based on submaximal velocities. The Vmaxpro showed high validity during the 1RM test for BP (r = 0.935) and SQ (r = 0.900), but with decreasing validity at lower MVs. The L-V variables and the 1RM demonstrated high validity for BP (r = 0.808-0.942) and SQ (r = 0.615-0.741) with a systematic overestimation. Coefficients of variance for intra- and inter-day reliability ranged from 2.4% to 9.7% and from 3.2% to 8.6% for BP and SQ, respectively. The Vmaxpro appears valid at high and moderately valid at low MVs. Depending on the required degree of accuracy, the sensor may be sufficient for the prediction of L-V variables and the 1RM. Our data indicate the sensor to be suitable for monitoring changes in MVs within and between training sessions.

The aim of this study was to investigate the effect of 300 intermittent countermovement jumps (CMJs) on the mechanical power distribution at the joints of the lower limbs and the influence of the upper body to explain vertical jump performance. Fifteen male sport students (age 24.5 ± 2.3 years; body height 1.85 ± 0.06 m; body mass 84.8 ± 8.5 kg) performed a set of intermittent 300 CMJs at maximal effort. An inverse-dynamic approach was used to calculate the mechanical power at the hip, knee, and ankle joint for each jump. Jump height and mechanical power in the knee and ankle joints decreased significantly (p < .010), while remained the same in the hip joint. In contrast, a significant increased vertical velocity was observed for the upper body segment. In addition, a significant higher angular momentum at the center of mass was detected during the braking and propulsion phase. The findings highlight a fatigue-related decrease in lower limb power, particularly in the knee and ankle joints, which changed the mechanical power distribution at the joints of the lower limbs. The trunk extensor muscles were probably able to counteract the fatigue-related decrease in lower limb power by increased vertical velocity of the upper body segment and higher angular momentum at the center of mass during the braking and propulsion phase. Accordingly, the most effective way to maintain jumping performance in fatigued state would be to improve the fatigue resistance of the knee extensors, ankle plantar flexors, and trunk extensor muscles.

Worldwide different criteria are used for dealing with body height as an access restriction for the police service, but none of the defined minimum heights is supported by scientific research. Therefore, the objectives of the present work were to analyse tall and short men and women on their police-specific physical performance and their interaction with police-related personal protective equipment (PPE) in police-specific situations. For this purpose, the entire work was divided into four sub-studies, which included both laboratory and field tests. Wearing PPE significantly ( p < 0.05) reduced vertical jump performance independently of body height. Resilience to external forces (impacts) and pulling force in different grip heights were significantly ( p < 0.05) reduced for shorter subjects. Short subjects needed significantly ( p < 0.05) more time for rescuing and recovering a person from a car than tall subjects. These results provide evidence that taller subjects perform superior in police-specific scenarios.

Supplemental Digital Content is Available in the Text. Abstract Feuerbacher, JF, Jacobs, MW, Dragutinovic, B, Goldmann, J-P, Cheng, S, and Schumann, M. Validity and test-retest reliability of the Vmaxpro sensor for evaluation of movement velocity in the deep squat. J Strength Cond Res 37(1): 35–40, 2023—We aimed at assessing the validity and test-retest reliability of the inertial measurement unit-based Vmaxpro sensor compared with a Vicon 3D motion capture system and the T-Force sensor during an incremental 1-repetition maximum (1RM) test and at submaximal loads. Nineteen subjects reported to the laboratory for the 1RM test sessions, whereas 15 subjects carried out another 3 sessions consisting of 3 repetitions with 4 different intensities (30, 50, 70, and 90% of 1RM) to determine the intra- and interday reliability. The Vmaxpro sensor showed high validity (Vicon: R2 = 0.935; T-Force: R2 = 0.968) but an overestimation of the mean velocities (MVs) of 0.06 ± 0.08 m·s−1 and 0.06 ± 0.06 m·s−1 compared with Vicon and T-Force, respectively. Regression analysis indicated a systematic bias that is increasing with higher MVs. The intraclass correlation coefficients (ICCs) for Vmaxpro were moderate to high for intraday (ICC: 0.662–0.938; p ≤ 0.05) and for interday (ICC: 0.568–0.837; p ≤ 0.05) reliability, respectively. The Vmaxpro is a valid and reliable measurement device that can be used to monitor movement velocities within a training session. However, practitioners should be cautious when assessing movement velocities on separate days because of the moderate interday reliability.

Linear acceleration is a key performance determinant and major training component of many sports. Although extensive research about lower limb kinetics and kinematics is available, consistent definitions of distinctive key body positions, the underlying mechanisms and their related movement strategies are lacking. The aim of this 'Method and Theoretical Perspective' article is to introduce a conceptual framework which classifies the sagittal plane 'shin roll' motion during accelerated sprinting. By emphasising the importance of the shin segment's orientation in space, four distinctive key positions are presented ('shin block', 'touchdown', 'heel lock' and 'propulsion pose'), which are linked by a progressive 'shin roll' motion during swing-stance transition. The shin's downward tilt is driven by three different movement strategies ('shin alignment', 'horizontal ankle rocker' and 'shin drop'). The tilt's optimal amount and timing will contribute to a mechanically efficient acceleration via timely staggered proximal-to-distal power output. Empirical data obtained from athletes of different performance levels and sporting backgrounds are required to verify the feasibility of this concept. The framework presented here should facilitate future biomechanical analyses and may enable coaches and practitioners to develop specific training programs and feedback strategies to provide athletes with a more efficient acceleration technique.

BACKGROUND:The aim of this study was to examine the impact of personal protective equipment (PPE) on human thermoregulation and its alteration in groups of different training status. METHODS:Forty-five men performed a maximum voluntary contraction test in an upright pull position to determine lower body strength and a graded treadmill test to determine maximum oxygen uptake (V̇O2max). Body composition was estimated via bioelectric impedance analysis. According to specific cutoff values, participants were assigned to a group of endurance-trained, strength-trained, endurance- and strength-trained, or untrained individuals. Subsequently, they completed two graded exercise tests until volitional exhaustion, once wearing sports wear (SPW) and once wearing PPE (20.9 kg). Participants were weighed before and afterward to investigate sweat loss and sweat rate. Body temperature was measured continuously from the tympanic membrane. Energy expenditure was derived from breathing gas analysis. RESULTS:Sweat rate was 91% higher in PPE than in SPW but not significantly different between groups (P>0.05). Body temperature was significantly higher in PPE during submaximal (+1.14±0.45 °C) and maximal exercise intensity (0.68±0.57 °C) and was poorely related to V̇O2max and body composition. Energy expenditure significantly differed between both garments (+37% in PPE) and groups (P<0.05). Additionally, energy expenditure significantly correlated with body weight (r=0.84 in SPW and r=0.68 in PPE). CONCLUSIONS:Strength training alone does not seem to have any or negligible effects on thermoregulation. Endurance training and weight management might lead to rather small improvements in heat tolerance.

Purpose: To investigate the influence of aerobic capacity, muscle strength, and body composition on performance and metabolic demands of men wearing personal protective equipment (PPE). Methods: 45 men were assigned to one of four groups which significantly differed in upright pull isometric strength (MVC <= 1325 N or >= 1531 N) and maximum oxygen uptake (VO(2)max <= 51.9 mL min(-1).kg(-1) or >= 56.0 mL min(-1).kg(-1)): endurance-trained (low MVC, high VO(2)max), strength-trained (high MVC, low VO(2)max), endurance- and strength-trained (high MVC, high VO(2)max), and untrained (low MVC, low VO(2)max). Each participant underwent two test series consisting of a repeated 10 m dummy drag and a graded exercise test wearing either sportswear or PPE of a German riot police unit weighing 20.9 kg (statistics: two-way repeated measures ANOVA, stepwise multiple linear regressions). Results: With PPE, dummy drag and running performance were impaired by 14 +/- 9% and 58 +/- 7%. Groups with high MVC dragged the dummy significantly faster than groups with low MVC (17.5 +/- 1.8 s/17.6 +/- 1.4 s vs. 23.4 +/- 5.6 s/22.3 +/- 3.5 s). Running distance was significantly higher in groups with high VO(2)max (4.5 +/- 0.8 km/4.4 +/- 0.7 km vs. 3.1 +/- 0.5 km/2.8 +/- 0.5 km). Body composition variables partially correlated with performance (R ranging from -0.70 to 0.41), but were not significant predictors of the regression models in PPE. Conclusions: Individuals who showed a certain degree of aerobic endurance, as well as muscle strength, performed consistently well during the test series. Therefore, none of these variables should be trained in isolation but optimized in combination to be capable in a variety of operational tasks.

The diverse tasks of special operations police (SOP) units place high physical demands on every officer. Being fit for duty requires a wide range of motor abilities which must be trained regularly and in a structured manner. But SOP operators have to plan and manage large proportions of their training alone, which makes it difficult to control. Therefore, this study aimed to highlight strengths and deficits of the SOP operators' fitness by comparing them to elite athletes, and to define future training goals. Retrospective data of 189 male SOP operators were used, who completed several isometric strength tests, a graded exercise test to determine maximal oxygen uptake, and countermovement jumps to determine leg muscle power. On the basis of a literature search, performance data were then compared to a total of 3,028 elite male athletes from 36 Summer Olympic disciplines. Pooled means and standard deviations were calculated for each discipline and effect sizes were used to analyze their similarities and differences to the SOP unit. On average, SOP operators were taller, heavier, and stronger than elite athletes. But both the ability to convert this strength into explosive movement and aerobic power was significantly less developed. From this point of view, SOP operators should consider polarized endurance training to work efficiently on improving aerobic performance. In addition, regular plyometric training seems necessary to improve leg muscle power and agility.

The purpose of this study was to validate the calculation of reaction time (RT) and normalised power in block starts without considering arm ground reaction forces (GRFs) or using two kinematics-only methods. The RT and normalised power in the action phase were calculated using four different methods: using GRFs of arms and legs by force plates (whole F-based method), which can be regarded as the most valid method, using GRFs of legs captured by force plates (legs F-based method), using position of the centre of mass of the entire body captured by high-speed cameras (whole P-based method), and using only a partial subset of segment position (partial P-based method). Bland-Altman plots demonstrated that the RT of the legs F-based method was not similar to that of the whole F-based method: the mean difference was 7.4 ms and the 95% limits of agreement was-45.1 to 59.8 ms, and it was the least valid method for the calculation among the four methods. In contrast, the normalised power was more valid in the legs F-based method, followed by whole and partial P-based methods. This information will help researchers and practitioners to decide upon their analysis methods when analysing block start performance.

The purpose of this study was to analyse stiffness in the mechanical system of the world’s elite high jumpers. Seven male elite high jump athletes (personal best 2.24 m ± 0.06 m) were filmed with 19 Infrared-High-Speed-Cameras during jumping. Kinetics were captured with a force plate. It was found that a different leg and joint stiffness during takeoff enables nearly the same jumping height. For example, a typical power jumper with a leg stiffness of 543.6 N m kg reached 2.13 m, while a typical speed jumper with a leg stiffness of 1133.5 N m kg reached a comparable height of 2.12 m. Therefore, it seems that sports performance in single leg jumping is not limited by athlete’s leg and joint stiffness in a small group of male elite high jumpers.

The purpose of this study was to explore the relationship between the forces applied to the starting blocks and the start performances (SPs) of amputee sprinters (ASs) and non-amputee sprinters (NASs). SPs of 154 male and female NASs (100-m personal records [PRs], 9.58-14.00 s) and 7 male ASs (3 unilateral above knee, 3 unilateral below knee, 1 bilateral below knee; 100 m PRs, 11.70-12.70 s) with running specific prostheses (RSPs) were analysed during full-effort sprint starts using instrumented starting blocks that measured the applied forces in 3D. Using the NAS dataset and a combination of factor analysis and multiple regression techniques, we explored the relationship between force characteristics and SP (quantified by normalized average horizontal block power). Start kinetics were subsequently compared between ASs and NASs who were matched based on their absolute 100 m PR and their 100 m PR relative to the world record in their starting class. In NASs, 86% of the variance in SP was shared with five latent factors on which measured parameters related to force application to the rear and front blocks and the respective push-off directions in the sagittal plane of motion were loaded. Mediolateral force application had little influence on SP. The SP of ASs was significantly reduced compared to that of NASs matched on the basis of relative 100-m PR (-33.8%; d = 2.11, p < 0.001), while a non-significant performance reduction was observed when absolute 100-m PRs were used (-17.7%; d = 0.79, p = 0.09). These results are at least partially explained by the fact that force application to the rear block was clearly impaired in the affected legs of ASs.

Abstract Wahl, P, Sanno, M, Ellenberg, K, Frick, H, Böhm, E, Haiduck, B, Goldmann, J-P, Achtzehn, S, Brüggemann, G-P, Mester, J, and Bloch, W. Aqua cycling does not affect recovery of performance, damage markers, and sensation of pain. J Strength Cond Res 31(1): 162–170, 2017—To examine the effects of aqua cycling (AC) vs. passive recovery (P) on performance, markers of muscle damage, delayed onset of muscle soreness (DOMS), and the persons perceived physical state (PEPS) after 300 countermovement jumps (CMJs). Twenty male participants completed 300 CMJs. Afterward, they were randomly assigned to either the P group or the AC group, the latter performing 30 minutes of AC. Before, directly after the 300 CMJs, after the recovery session, and up to 72 hours post, performance of leg extensor muscles, damage markers, the PEPS, and DOMS were measured. Jumping height during 300 CMJs significantly decreased in both groups (AC: 13.4% and P: 14.6%). Maximal isometric strength (AC: 21% and P: 22%) and dynamic fatigue test (AC: 35% and P: 39%) of leg extensor muscles showed significant decreases in both groups. Myoglobin, creatine kinase, and lactate dehydrogenase significantly increased over time in both groups. Each of the 4 dimensions of the PEPS and DOMS showed significant changes over time. However, no significant differences between both groups were found for any of the parameters. Coaches and athletes should be aware that vertical jumping–induced fatigue decreases the ability to generate maximal isometric and submaximal dynamic force for more than 3 days after training. A single 30-minute session of AC was not able to attenuate the effects on muscular performance, markers of muscle damage, DOMS, or the PEPS compared with passive rest.