European journal of applied physiology · 2026
Time course and regional heterogeneity of hamstring muscle thickness after maximal concentric exercise in men and women.
СтатьяНазвание и аннотация: Перевод пока не подготовлен
Обработка статьи · этапы, ошибки и управление
Загрузка состояния…
Ошибки и ограничения
История · было → стало
Состояние обновляется каждые 5 секунд, пока блок открыт. Процент показывается только там, где известен объём работы. Пауза останавливает продолжение этапа; текущий запрос к источнику может завершиться.
Sahinis Chrysostomos, Pavlidis Konstantinos, Kellis Eleftherios
Аннотация
PURPOSE: This study examined the early time course of hamstring thickness changes after acute maximal concentric knee-flexions across multiple measurement sites in men and women.
METHODS: Twenty-two young adults (11 men, 11 women) performed 50 maximal unilateral concentric knee-flexions at 120°·s⁻¹. Muscle thickness of the biceps femoris (BF) and semitendinosus (ST) was assessed using ultrasound at proximal, middle, and distal sites at baseline and repeatedly during 30-min of recovery.
RESULTS: Linear mixed-effects models showed that thickness increased rapidly, peaking immediately post-exercise or at 5-min (mean relative change: 10.4 ± 4.9%), and returned toward baseline by 15–30-min. Absolute thickness increases differed between muscles and sites (p < .05), with larger responses observed in BF than ST (d = 0.61–3.23) and the greatest change at the middle site (d = 1.00–4.04). In contrast, relative thickness changes were largely comparable across muscles, sites, and sexes (p > .05). However, considerable inter-individual variability was found in relative thickness changes among measurement sites with the distal regions most often contributed the largest share of total swelling (BF 45.5%, ST 54.5%).
CONCLUSION: Maximal concentric exercise induces transient hamstring thickness changes. Although relative thickness responses were similar across sexes, muscles, and regions, substantial inter-individual variability in regional patterns suggests that the hamstrings may not respond as a uniform unit acutely following exercise.
SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00421-026-06223-8.
METHODS: Twenty-two young adults (11 men, 11 women) performed 50 maximal unilateral concentric knee-flexions at 120°·s⁻¹. Muscle thickness of the biceps femoris (BF) and semitendinosus (ST) was assessed using ultrasound at proximal, middle, and distal sites at baseline and repeatedly during 30-min of recovery.
RESULTS: Linear mixed-effects models showed that thickness increased rapidly, peaking immediately post-exercise or at 5-min (mean relative change: 10.4 ± 4.9%), and returned toward baseline by 15–30-min. Absolute thickness increases differed between muscles and sites (p < .05), with larger responses observed in BF than ST (d = 0.61–3.23) and the greatest change at the middle site (d = 1.00–4.04). In contrast, relative thickness changes were largely comparable across muscles, sites, and sexes (p > .05). However, considerable inter-individual variability was found in relative thickness changes among measurement sites with the distal regions most often contributed the largest share of total swelling (BF 45.5%, ST 54.5%).
CONCLUSION: Maximal concentric exercise induces transient hamstring thickness changes. Although relative thickness responses were similar across sexes, muscles, and regions, substantial inter-individual variability in regional patterns suggests that the hamstrings may not respond as a uniform unit acutely following exercise.
SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00421-026-06223-8.