Blood flow restriction (BFR) with low-load resistance exercise (RE) is often used as a surrogate to traditional high-load RE to stimulate muscular adaptations, such as hypertrophy and strength. However, it is not clear whether such adaptations are achieved through similar cellular and molecular processes. We compared changes in muscle function, morphology, and signaling pathways between these differing training protocols. Twenty-one males and females (means ± SD: 24.3 ± 3.1 yr) experienced with resistance training (4.9 ± 2.6 yr) performed 9 wk of resistance training (three times per week) with either high-loads (75%–80% 1RM; HL-RT), or low-loads with BFR (30%–40% 1RM; LL-BFR). Before and after the training intervention, resting muscle biopsies were collected, and quadricep cross-sectional area (CSA), muscular strength, and power were measured. Approximately 5 days following the intervention, the same individuals performed an additional “acute” exercise session under the same conditions, and serial muscle biopsies were collected to assess hypertrophic- and ribosomal-based signaling stimuli. Quadricep CSA increased with both LL-BFR (7.4 ± 4.3%) and HL-RT (4.6 ± 2.9%), with no significant differences between training groups (P = 0.37). Muscular strength also increased in both training groups, but with superior gains in squat 1RM occurring with HL-RT (P < 0.01). Acute phosphorylation of several key proteins involved in hypertrophy signaling pathways, and expression of ribosomal RNA transcription factors occurred to a similar degree with LL-BFR and HL-RT (all P > 0.05 for between-group comparisons). Together, these findings validate low-load resistance training with continuous BFR as an effective alternative to traditional high-load resistance training for increasing muscle hypertrophy in trained individuals. NEW & NOTEWORTHY Low-load resistance exercise with blood flow restriction (LL-BFR) is an effective method for stimulating muscular adaptations, but phenotypical and mechanistic comparisons with traditional high-load training (HL-RT) in trained populations are scarce. The findings indicate that hypertrophy, but not strength, is comparable between LL-BFR and HL-RT, and the acute cellular and molecular processes for hypertrophy were similar, but not identical, between protocols. Thus, LL-BFR is an effective alternative to HL-RT for obtaining hypertrophy in trained populations.

Blood flow-restricted exercise is currently used as a low-intensity time-efficient approach to reap many of the benefits of typical high-intensity training. Evidence continues to lend support to the notion that even highly trained individuals, such as athletes, still benefit from this mode of training. Both resistance and endurance exercise may be combined with blood flow restriction to provide a spectrum of adaptations in skeletal muscle, spanning from myofibrillar to mitochondrial adjustments. Such diverse adaptations would benefit both muscular strength and endurance qualities concurrently, which are demanded in athletic performance, most notably in team sports. Moreover, recent work indicates that when traditional high-load resistance training is supplemented with low-load, blood flow-restricted exercise, either in the same session or as a separate training block in a periodised programme, a synergistic and complementary effect on training adaptations may occur. Transient reductions in mechanical loading of tissues afforded by low-load, blood flow-restricted exercise may also serve a purpose during de-loading, tapering or rehabilitation of musculoskeletal injury. This narrative review aims to expand on the current scientific and practical understanding of how blood flow restriction methods may be applied by coaches and practitioners to enhance current athletic development models.

The aim of this insights paper is to propose how the theory of ecological dynamics may invite re-consideration of how sport scientists could support performance, learning and development of children and youth in sports programmes. We seek to outline why learning should be individualised and contextualised, based on the specific needs of learners, such as children and youth, women and disabled athletes in sport. Case examples from individual and team sports are presented to illustrate how constraints can be designed to enrich interactions of children and youth with different performance environments, based on integrating principles of specificity and generality in learning and development. These case examples suggest how a collaborative effort by sport scientists and coaches in children and youth sport may be undertaken in a department of methodology to enrich learning and performance.

Hybrid fitness competitions such as HYROX have rapidly gained popularity, blending aerobic endurance running with a variety of high-intensity resistance- and ergometer-based stations in a globally standardized format. The sport's unique structure, comprising eight 1-kilometer runs interspersed with diverse workload stations, presents distinct physiologic, biomechanical, and technical demands. This review synthesizes existing research on hybrid fitness events to identify the key determinants of HYROX performance, emphasizing aerobic capacity, anaerobic power, local muscular endurance, and maximal strength. The aerobic system is foundational, enabling recovery between high-intensity efforts and sustaining performance during the event's prolonged duration. Conversely, anaerobic capacity is critical for executing the high-intensity efforts demanded by each fitness station. Local muscular endurance supports repeated submaximal contractions, while strength and power underpin performance in movements such as sled pushes and running economy. Technical proficiency and injury prevention strategies are also discussed, alongside targeted programming recommendations, including high-intensity interval training, circuit training, and blood flow restriction methods. Despite its growing popularity, limited sport-specific research exists, necessitating further investigation to refine training and performance strategies. This review provides a comprehensive framework for athletes and coaches to optimize preparation and performance in HYROX, contributing to the broader understanding of hybrid fitness competitions.

Individual strength qualities have been associated with sprint performance, but previous researchers have not partitioned the unique and shared variance each contributes, nor included the full range of strength qualities in a single analysis. This study is the first to model all five strength qualities (heavy dynamic, fast dynamic, reactive, isometric, and explosive) concurrently against sprint performance. Multiple regression was used to quantify the unique and shared variance each quality contributes across multiple sprint distances. Eighty‐four resistance‐trained individuals (62 male, 22 female; 21.4 ± 3.4 years, 79.9 ± 12.1 kg), completed countermovement jumps, drop jumps, isometric squat, isometric mid‐thigh pull, and a three‐repetition maximum (3RM) back squat, alongside a 40‐m sprint. Three multiple linear regression models were constructed to partition the unique and shared variance contributed by each strength quality to sprint performance across 5–40 m and maximal velocity, with sex included as a covariate. Combining countermovement jump height, 3RM back squat, and drop jump reactive strength index explained up to 75.2% of variance in sprint performance. The addition of isometric peak force or force at 100 milliseconds resulted in negligible increases in explained variance.

Davids, CJ, Raastad, T, Geneau, MC, James, LP, Lichtwark, G, Coombes, JS, Peake, JM, and Roberts, LA. Decrements in neuromuscular function are reduced following low-load continuous blood flow restriction exercise compared to high-load resistance exercise. J Strength Cond Res 40(5): 552–559, 2026—The aim of this study was to quantify neuromuscular fatigue during and following resistance exercise protocols varying in load and blood flow restriction (BFR) application. Twelve strength-trained male subjects performed 4 sets of squat exercises under 4 conditions: (a) low-load resistance exercise (LL-RE, 30% one-repetition maximum [1RM]), (b) high-load resistance exercise (HL-RE, 70% 1RM), (c) LL-RE with continuous BFR (BFR-C), and (d) LL-RE with intermittent BFR (BFR-I). Neuromuscular fatigue markers included repetition velocity, isometric knee extensor torque, jump performance, and quadriceps contractile properties. Effort perceptions were also recorded. Statistical significance was set at p < 0.05. Repetition velocities slowed with HL-RE (−8 ± 5%) and BFR-C (−4 ± 11%), significantly differing from LL-RE (7 ± 5%) and BFR-I (3 ± 5%). Effort ratings increased significantly across all conditions (all p < 0.01), with higher ratings observed during HL-RE and BFR-C compared with LL-RE and BFR-I for all 4 sets (all p < 0.01). At 60 minutes postexercise, knee extensor torque was reduced more with HL-RE (−8 ± 10%) than BFR-C (−6 ± 11%), and evoked contraction torque showed a similar pattern (HL-RE: −18 ± 12%; BFR-C: −5 ± 12%). Jump height declined across all conditions but was significantly greater following HL-RE (−13 ± 6%). Both HL-RE and BFR-C induced neuromuscular fatigue, slowing repetition velocities and elevating effort perceptions, but impairments were more pronounced with HL-RE after 60 minutes. Blood flow restriction-C may be a valuable alternative in athletic contexts where loading and/or postexercise fatigue must be managed.