ISW performance depends, at least in part, on quadriceps strength.35 The present study showed a relationship between the change in quadriceps strength and change in walking
performance. An increase in muscle strength following training is commonly achieved through increased volitional drive.36 The change in QMVC was associated with an increase in the twitch response to femoral nerve stimulation, suggesting that contractility had increased. However, whole-body muscle mass estimated by bioimpedance was similar. Competing but not mutually exclusive explanations could involve a change in muscle fibre orientation37 or, more likely, a localised increase in quadriceps muscle volume that bioimpedance was too insensitive to detect. Direct measurement of leg muscle volume would have addressed this.
ISW performance depends, at least in part, on quadriceps strength.35 The present study showed a relationship between the change in quadriceps strength and change in walkingperformance. An increase in muscle strength following training is commonly achieved through increased volitional drive.36 The change in QMVC was associated with an increase in the twitch response to femoral nerve stimulation, suggesting that contractility had increased. However, whole-body muscle mass estimated by bioimpedance was similar. Competing but not mutually exclusive explanations could involve a change in muscle fibre orientation37 or, more likely, a localised increase in quadriceps muscle volume that bioimpedance was too insensitive to detect. Direct measurement of leg muscle volume would have addressed this.
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