Title

Eccentric cycling emphasising a low cardiopulmonary demand increases leg strength equivalent to workload matched concentric cycling in middle age sedentary males

RIS ID

127665

Publication Details

Lewis, M. C., Peoples, G. E., Groeller, H. & Brown, M. A. (2018). Eccentric cycling emphasising a low cardiopulmonary demand increases leg strength equivalent to workload matched concentric cycling in middle age sedentary males. Journal of Science and Medicine in Sport, 21 (12), 1238-1243.

Abstract

Objectives: This study determined if eccentric endurance cycling, eliciting a low cardiovascular demand, could stimulate muscle strength adaptations in sedentary middle-aged males.

Design: Twenty-four middle-aged sedentary males were allocated to concentric (CON) or matched workload eccentric (ECC) cycling (60% peak concentric workload) according to their maximal voluntary isometric quadriceps strength.

Methods: Seventeen participants [42.7 ± 8.3 years, BMI 28.6 ± 5.2, peak oxygen consumption [30.5 ± 5.8 mL kg−1 min−1 ] completed 8 weeks (2 sessions per week) of CON (n = 8) or ECC (n = 9) cycle training. Incline leg press (6RM), maximal voluntary isometric contraction (MVIC) torque of the quadriceps and peak oxygen consumption were measured at baseline and 8 weeks.

Results: Eccentric cycle training resulted in low cardiovascular demand (CON 154 ± 2; ECC 95 ± 3 b min−1 P < 0.05) and ratings of perceived exertion (CON 14.9 ± 0.3; ECC 9.5 ± 0.3/20 P < 0.05). Peak oxygen consumption improved within the CON group (Baseline 27.4 ± 2.1; 8 weeks: 30.0 ± 1.7 mL kg−1 min−1 P < 0.05) and not within the ECC group (Baseline 33.2 ± 1.5; 8 weeks 33.3 ± 1.6 mL kg−1 min−1 ) following training. 6RM (CON 176 ± 20; ECC 192 ± 11 kg) and MVIC (CON 199 ± 25; ECC 199 ± 25 Nm) strength were equivalent at baseline (P > 0.05). Both groups significantly increased 6RM (CON 13.0 ± 3.0; ECC 10.7 ± 3.2%) and MVIC (CON 12.9 ± 4.3; ECC 18.8 ± 3.0%) relative to their own baseline (P < 0.05). Therefore, improved leg strength was equivalent between CON and ECC groups despite the varied training (P > 0.05).

Conclusions: In sedentary middle age males, eccentric endurance cycling with a low cardiovascular demand, increased both quadriceps isometric and 6RM strength comparable to a matched workload concentric cycling program.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.jsams.2018.05.009