bjectives:Whether low-load resistance training(RT)without muscle failure,with or without bloodflow restriction(BFR),is suffcient to increase strength and muscle growth of calf musclesin trained individualsisstill uncle...bjectives:Whether low-load resistance training(RT)without muscle failure,with or without bloodflow restriction(BFR),is suffcient to increase strength and muscle growth of calf musclesin trained individualsisstill unclear.This study aimed to compare the effects of low-intensity BFR RT vs.traditional low-intensity RT(noBFR)with moderate training volume on strength and circumference.Methods:We designed a parallel,randomized controlled trial including 36 RT-trained participants(BFR:7 females,32.9±8.8 years,11 males,28.4±3.6 years;noBFR;8 females,29.6±3.4 years;10 males,28.6±4.9 years)who underwent eight weeks of twice-weekly low-load RT with a total of 16 RT sets(30%of one-repetition maximum[1RM]).RT consisted of bilateral calf raises and seated unilateral calf raises,each conducted with 4 sets(30,15,15,15 repetitions not to failure)of either BFR or noBFR.Outcome measures included calf circumference(CC),leg stiffness(LS),and various strength tests(seated and standing calf raise 1RM,isokinetic strength of plantar-and dorsiflexion).Results:There were no significant interactions or group effects for most measures.Both groups showed significant improvementsin seated calf raise strength(p=0.046,η^(2)p=0.17).Pairwise comparisons indicated moderate to large effect sizes for strength improvements(standardized mean differences:0.35–1.11),but no changes in calf circumference were observed in either group.Conclusions:Low-load RT with and without BFR are useful to increase strength without necessarily affecting hypertrophy.Low-intensity BFR training did not confer additional benefits over traditional low-intensity RT for calf muscle strength or circumference,questioning its general advantage under such conditions.展开更多
文摘bjectives:Whether low-load resistance training(RT)without muscle failure,with or without bloodflow restriction(BFR),is suffcient to increase strength and muscle growth of calf musclesin trained individualsisstill unclear.This study aimed to compare the effects of low-intensity BFR RT vs.traditional low-intensity RT(noBFR)with moderate training volume on strength and circumference.Methods:We designed a parallel,randomized controlled trial including 36 RT-trained participants(BFR:7 females,32.9±8.8 years,11 males,28.4±3.6 years;noBFR;8 females,29.6±3.4 years;10 males,28.6±4.9 years)who underwent eight weeks of twice-weekly low-load RT with a total of 16 RT sets(30%of one-repetition maximum[1RM]).RT consisted of bilateral calf raises and seated unilateral calf raises,each conducted with 4 sets(30,15,15,15 repetitions not to failure)of either BFR or noBFR.Outcome measures included calf circumference(CC),leg stiffness(LS),and various strength tests(seated and standing calf raise 1RM,isokinetic strength of plantar-and dorsiflexion).Results:There were no significant interactions or group effects for most measures.Both groups showed significant improvementsin seated calf raise strength(p=0.046,η^(2)p=0.17).Pairwise comparisons indicated moderate to large effect sizes for strength improvements(standardized mean differences:0.35–1.11),but no changes in calf circumference were observed in either group.Conclusions:Low-load RT with and without BFR are useful to increase strength without necessarily affecting hypertrophy.Low-intensity BFR training did not confer additional benefits over traditional low-intensity RT for calf muscle strength or circumference,questioning its general advantage under such conditions.
