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Tonic and phasic EMGGG activity as a percentage of maximum by weight (left) and age (right) groups. Values are means ± SE. Tonic EMGGG decreased significantly with increasing weight independent of age (P < 0.0001). Weight-related decreases in tonic EMGGG were greater in young than old mice (P < 0.0001). In contrast, phasic EMGGG activity increased significantly with weight independent of age (P < 0.0001).
