Investigation Of Muscle Metabolism Of The Quadriceps Via High-resolution Respirometry and 31P MRS In Connection With A 10 Week Endurance Training

Pesta, Dominik; Jacobs, Robert A.; Macek, Christian; Hoppel, Florian; Faulhaber, Martin; Lundby, Carsten; Burtscher, Martin; Gnaiger, Erich; Schocke, Michael

doi:10.1249/01.mss.0000402885.64245.c9

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“…In a group of adolescent soccer players completing backward running twice weekly for 8 weeks, Uthoff et al 24 reported CMJ was significantly greater compared to a group performing a volume-matched program of forward running. While in the present investigation the significant improvement in CMJ demonstrated by RG (1.8%) was less than the 9.9% recorded by Uthoff et al 24 , this may support the differences in CMJ response between adolescents and adults completing high intensity training that has been reported previously 29 . Further, a difference in the application of ground reaction forces between level and graded backward walking and backward running training may manifest uniquely in tests involving force applied in a vertical or horizontal direction (e. g., CMJ versus BJ).…”

Section: Discussionsupporting

confidence: 59%

Retrograde Training: Effects on Lower Body Strength and Power

2022

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Backward walking and running on positive grades (retrograde training) represents a closed kinetic chain exercise used by rehabilitation specialists for patellofemoral-related injuries. To date, no longitudinal studies exist to support it use. This investigation examined the effects of retrograde training on lower body strength and power in recreational athletes aged 18–50 years over 6 weeks. Thirty-seven subjects were divided into two groups. Group 1 performed retrograde training 3 days∙wk−1 using treadmill speeds, grades and bout durations ranging from 1.6–4.9 m∙sec−1, 2.5–27.5% and 10–30 seconds, respectively (RG, n=19). Group 2 was a control group who continued their normal training (CON, n=18). Pre- and posttests assessed a variety of unilateral and bilateral measures including vertical and linear jumps, one repetition maximum leg press strength, and positive and negative power during weighted squat jumping on a horizontal leg press with a force plate. RG improved significantly in all tests (P<0.05). Mean effect size (ES) of the relative improvement in a majority of tests revealed a moderate to very large ES of RG training (ES range: 0.77–2.71). We conclude retrograde training effective for improving lower body strength and power in recreational athletes.

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Section: Discussionsupporting

confidence: 59%