Abstract
The study aimed to compare the chronic eccentric-overload training effects of unilateral (lateral lunge) vs bilateral (half-squat) using an inertial device, on hypertrophy and physical performance. Twenty-seven young team sports male players performed a 4 sets of 7 repetitions of inertial eccentric overload training, biweekly for 6 weeks, distributed in unilateral lunge group (UG: age: 22.8 ± 2.9 years; body mass: 75.3 ± 8.8 kg; height: 177.3 ± 3.7 cm) and bilateral squat group (BG: age: 22.6 ± 2.7 years; body mass: 79.5 ± 12.8 kg; height: 164.2 ± 7 cm). Lower limb muscle volume, counter movement jump (CMJ), power with both (POWER), dominant (POWERd) and no-dominant leg (POWERnd), change of direction turn of 90° with dominant (COD90d) and no-dominant leg (COD90nd) and 180° (COD180d and COD180nd), and 10m sprint time (T-10m) were measured pre and post-intervention. The UG obtained an increase of adductor major (+11.1%) and vastus medialis (+12.6%) higher than BG. The BG obtained an increase of vastus lateralis (+9.9%) and lateral gastrocnemius (+9.1%) higher than UG. Both groups improved CMJ, POWER, POWERd, POWERnd, COD90 and DEC-COD90, without changes in T-10m. The UG decrease DEC-COD90nd (-21.1%) and BG increase POWER (+38.6%) substantially more than the other group. Six-weeks of unilateral / bilateral EO training induce substantial improvements in lower limbs muscle volume and functional performance, although unilateral training seems to be more effective in improving COD90 performance.
Highlights
The majority of actions or movements produced in team sport matches require and increase the number of changes of direction (COD) at high speeds to be decisive in performance [1,2,3] or to have an advantage over opponents during competition [3, 4]
The pretreatment field analysis showed that the DEC-COD90d (+15.4% [90%CL: -6.72;42.62], moderate ES), the DEC-COD90nd (+20.3% [90%CL: -4.4;51.44], moderate ES), the DEC-COD180d (+12.7% [90%CL: -4.85;33.59], moderate ES), and the DEC-COD180nd (+15.1% [90%CL: -3.48;37.34], moderate ES) of unilateral lunge group (UG) were greater than in bilateral squat group (BG)
The aim of the present study was to compare the effects of chronic eccentric-overload training of unilateral vs bilateral using an inertial device in muscle volume, CODs, power, counter movement jump (CMJ) and 10-m sprint improvements in team sports players
Summary
The majority of actions or movements produced in team sport matches require and increase the number of changes of direction (COD) at high speeds to be decisive in performance [1,2,3] or to have an advantage over opponents during competition [3, 4]. Effects of unilateral and bilateral eccentric overload on muscle and performance of agility, and it describes a movement wherein no reaction to a stimulus is required and it is previously planned [2, 5]. Some authors have found that COD correlates with eccentric knee-flexor strength [8] and maximal eccentric lower-body strength [9, 10]. Despite those obvious physical requirements, there is a lack of information regarding the effects of eccentric-overload training on COD performance [2] and its influence on the different factors related to COD performance
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