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Low-volume muscle endurance training prevents decrease in muscle oxidative and endurance function during 21-day forearm immobilization.

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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]
Copyright of Acta Physiologica is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Low-volume muscle endurance training prevents decrease in muscle oxidative and endurance function during 21-day forearm immobilization.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Homma%2C+T%2E%22&quot;&gt;Homma, T.&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Hamaoka%2C+T%2E%22&quot;&gt;Hamaoka, T.&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Murase%2C+N%2E%22&quot;&gt;Murase, N.&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Osada%2C+T%2E%22&quot;&gt;Osada, T.&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Murakami%2C+M%2E%22&quot;&gt;Murakami, M.&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Kurosawa%2C+Y%2E%22&quot;&gt;Kurosawa, Y.&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Kitahara%2C+A%2E%22&quot;&gt;Kitahara, A.&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Ichimura%2C+S%2E%22&quot;&gt;Ichimura, S.&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Yashiro%2C+K%2E%22&quot;&gt;Yashiro, K.&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Katsumura%2C+T%2E%22&quot;&gt;Katsumura, T.&lt;/searchLink&gt;
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Acta+Physiologica%22&quot;&gt;Acta Physiologica&lt;/searchLink&gt;. Dec2009, Vol. 197 Issue 4, p313-320. 8p. 1 Diagram, 3 Graphs.
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  Data: 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 &#177; 3.4 s (mean &#177; 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 &#177; 2.8 and 64.2 &#177; 5.1 s, pre- and post-intervention respectively; P &lt; 0.01) but did not change for the Imm+Tr-group (50.3 &#177; 3.0 and 48.8 &#177; 5.0 s, ns). Endurance decreased significantly for the Imm-group (55.1 &#177; 5.1 and 44.7 &#177; 4.6 s, P &lt; 0.05) but did not change for the Imm+Tr-group (47.9 &#177; 3.0 and 51.7 &#177; 4.0 s, ns). MVC decreased similarly in both groups ( P &lt; 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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  Data: &lt;i&gt;Copyright of Acta Physiologica is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.1111/j.1748-1716.2009.02003.x
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        Text: English
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        PageCount: 8
        StartPage: 313
    Subjects:
      – SubjectFull: Oxidative stress
        Type: general
      – SubjectFull: Oxidation-reduction reaction
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      – SubjectFull: Animal immobilization
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      – SubjectFull: Phosphocreatine
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      – SubjectFull: Phosphates
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              Text: Dec2009
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