Aerobic Exercise Training Increases Muscle Water Content in Obese Middle-Age Men

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PURPOSE: The objective of this study is to determine whether muscle water content (H2Omuscle) expands with training in deconditioned middle-age men and the effects of this expansion in other muscle metabolites.

METHODS: Eighteen obese (BMI = 33 ± 3 kg⁻¹·m⁻²) untrained (V˙O2peak = 29 ± 7 mL⁻¹·kg⁻¹·min⁻¹) metabolic syndrome men completed a 4-month aerobic cycling training program. Vastus lateralis muscle biopsies were collected before and 72 h after the completion of the last training bout. Water content, total protein, glycogen concentration, and citrate synthase activity were measured in biopsy tissue. Body composition was assessed using dual-energy X-ray absorptiometry, and cardiometabolic fitness was measured during an incremental cycling test.

RESULTS: Body weight and fat mass were reduced -1.9% and -5.4%, respectively (P < 0.05), whereas leg fat free mass increased with training (1.8%, P = 0.023). Cardiorespiratory fitness (i.e., V˙O2peak), exercise maximal fat oxidation (i.e., FOmax), and maximal cycling power (i.e., Wmax) improved with training (11%, 33%, and 10%, respectively; P <0.05). ± (145 (17 (2%, (22 (p="0.15).</p" (proxy (ww) 11% 129 13 14% 15 18 22 24 25 31% 4 5 7 783 799 activity after although as by citrate concentration decreased density) expressed for from g·kg⁻¹ glycogen h2omuscle increased kilogram mitochondrial mmol·min⁻¹·kg⁻¹ months muscle of p="0.024)." per protein reaching significance statistical synthase to training, weight wet when whereas without ww) ww,>

CONCLUSIONS: Our findings suggest that aerobic cycling training increases quadriceps muscle water although reduces muscle protein concentration in obese metabolic syndrome men. Reduced protein concentration coexists with increased leg lean mass suggestive of a water dilution effect that however does not impair increased cycling leg power with training.

TidsskriftMedicine and Science in Sports and Exercise
Udgave nummer5
Sider (fra-til)822-828
Antal sider7
StatusUdgivet - maj 2016

ID: 167806000