Bibliographic Details
| Title: |
Low-volume muscle endurance training prevents decrease in muscle oxidative and endurance function during 21-day forearm immobilization. |
| Authors: |
Homma, T., Hamaoka, T., Murase, N., Osada, T., Murakami, M., Kurosawa, Y., Kitahara, A., Ichimura, S., Yashiro, K., Katsumura, T. |
| Source: |
Acta Physiologica. Dec2009, Vol. 197 Issue 4, p313-320. 8p. 1 Diagram, 3 Graphs. |
| Subjects: |
Oxidative stress, Oxidation-reduction reaction, Animal immobilization, Phosphocreatine, Phosphates |
| Abstract: |
Aim: To examine the effects of low-volume muscle endurance training on muscle oxidative capacity, endurance and strength of the forearm muscle during 21-day forearm immobilization (IMM-21d). Methods: The non-dominant arm ( n = 15) was immobilized for 21 days with a cast and assigned to an immobilization-only group (Imm-group; n = 7) or an immobilization with training group (Imm+Tr-group; n = 8). Training comprised dynamic handgrip exercise at 30% of pre-intervention maximal voluntary contraction (MVC) at 1 Hz until exhaustion, twice a week during the immobilization period. The duration of each exercise session was 51.7 ± 3.4 s (mean ± SE). Muscle oxidative capacity was evaluated by the time constant for phosphocreatine recovery ( τoffPCr) after a submaximal handgrip exercise using 31phosphorus-magnetic resonance spectroscopy. An endurance test was performed at 30% of pre-intervention MVC, at 1 Hz, until exhaustion. Results: τoffPCr was significantly prolonged in the Imm-group after 21 days (42.0 ± 2.8 and 64.2 ± 5.1 s, pre- and post-intervention respectively; P < 0.01) but did not change for the Imm+Tr-group (50.3 ± 3.0 and 48.8 ± 5.0 s, ns). Endurance decreased significantly for the Imm-group (55.1 ± 5.1 and 44.7 ± 4.6 s, P < 0.05) but did not change for the Imm+Tr-group (47.9 ± 3.0 and 51.7 ± 4.0 s, ns). MVC decreased similarly in both groups ( P < 0.01). Conclusions: Twice-weekly muscle endurance training sessions, each lasting approx. 50 s, effectively prevented a decrease in muscle oxidative capacity and endurance; however, there was no effect on MVC decline with IMM-21d. [ABSTRACT FROM AUTHOR] |
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| Database: |
Psychology and Behavioral Sciences Collection |
