Broad Spectrum Polyphenol Supplementation from Tart Cherry Extract on Markers of Recovery from Intense Resistance Exercise
Background: Tart cherry supplementation has been shown to enhance recovery from strenuous exercise due to its antioxidant properties. The majority of these studies used tart cherry juice, with a significant calorie content. The primary purpose of this study was to assess whether powdered tart cherry extract with minimal calorie content reduces oxidative stress and enhances recovery following intense resistance exercise.
Methods: Thirteen men (mean age: 26.2±5.3 years; height: 184.3±8.2 cm; weight: 92.9±15.6 kg) performed a demanding resistance exercise protocol consisting of 6 sets of 10 repetitions of barbell back squat with 80% 1RM. The protocol was performed once following 7 days of 500 mg of tart cherry extract and once following placebo. Serum protein carbonyl (PC) content, creatine kinase activity (CK) and creatine kinase myocardial band content (CK-MB) were used to assess oxidative stress, skeletal and cardiac muscle damage respectively. Muscle soreness was assessed by visual analog scale. Physical performance was measured by countermovement jump power and handgrip dynamometer strength.
Results: There was a significant increase in PC in the placebo (PL) condition when compared to the Tart Cherry (TC) condition at IP (PL: 0.4±0.3 vs. TC: -0.4±0.2 nmol∙mg-1; p<0.001), 1 hr (PL: 0.3±0.3 vs. TC: -0.7±0.3 nmol∙mg-1; p<0.001) and 24 hr (PL: 0.1±0.4 vs. TC: -0.3±0.5 nmol∙mg-1; p=0.010). There was a significant increase in CK activity in PL when compared to the TC at IP (PL: 491.1±280 vs. TC: 296.3±178 U∙L-1; p=0.008) and 3 hr (PL: -87±123 vs. TC: 43.1±105.3 U∙L-1; p=0.006). There was a significant (p=0.003) increase in CKMB concentration in PL when compared to the TC (PL: 21.6±12.4 vs. TC: -0.3±11.8 ng∙ml-1; p=0.006) at 1 hr post. There was a significant increase in handgrip strength in TC when compared to PL (PL: -2±5.1 vs. TC: 1.7±3 kg; p=0.017) at 24 hours post.
Conclusions: This study demonstrated that tart cherry extract reduced oxidative stress and markers of muscle and cardiac damage following intense resistance exercise. This occurred along with a prevention of the decrease in strength seen following the intense exercise protocol. These benefits were seen with minimal energy intake.
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Posted 04 Dec, 2020
Received 12 Jan, 2021
Received 07 Jan, 2021
On 06 Dec, 2020
On 06 Dec, 2020
On 05 Dec, 2020
Invitations sent on 03 Dec, 2020
On 22 Nov, 2020
On 22 Nov, 2020
On 22 Nov, 2020
On 28 Aug, 2020
On 09 Aug, 2020
On 09 Aug, 2020
On 08 Aug, 2020
On 08 Aug, 2020
Broad Spectrum Polyphenol Supplementation from Tart Cherry Extract on Markers of Recovery from Intense Resistance Exercise
Posted 04 Dec, 2020
Received 12 Jan, 2021
Received 07 Jan, 2021
On 06 Dec, 2020
On 06 Dec, 2020
On 05 Dec, 2020
Invitations sent on 03 Dec, 2020
On 22 Nov, 2020
On 22 Nov, 2020
On 22 Nov, 2020
On 28 Aug, 2020
On 09 Aug, 2020
On 09 Aug, 2020
On 08 Aug, 2020
On 08 Aug, 2020
Background: Tart cherry supplementation has been shown to enhance recovery from strenuous exercise due to its antioxidant properties. The majority of these studies used tart cherry juice, with a significant calorie content. The primary purpose of this study was to assess whether powdered tart cherry extract with minimal calorie content reduces oxidative stress and enhances recovery following intense resistance exercise.
Methods: Thirteen men (mean age: 26.2±5.3 years; height: 184.3±8.2 cm; weight: 92.9±15.6 kg) performed a demanding resistance exercise protocol consisting of 6 sets of 10 repetitions of barbell back squat with 80% 1RM. The protocol was performed once following 7 days of 500 mg of tart cherry extract and once following placebo. Serum protein carbonyl (PC) content, creatine kinase activity (CK) and creatine kinase myocardial band content (CK-MB) were used to assess oxidative stress, skeletal and cardiac muscle damage respectively. Muscle soreness was assessed by visual analog scale. Physical performance was measured by countermovement jump power and handgrip dynamometer strength.
Results: There was a significant increase in PC in the placebo (PL) condition when compared to the Tart Cherry (TC) condition at IP (PL: 0.4±0.3 vs. TC: -0.4±0.2 nmol∙mg-1; p<0.001), 1 hr (PL: 0.3±0.3 vs. TC: -0.7±0.3 nmol∙mg-1; p<0.001) and 24 hr (PL: 0.1±0.4 vs. TC: -0.3±0.5 nmol∙mg-1; p=0.010). There was a significant increase in CK activity in PL when compared to the TC at IP (PL: 491.1±280 vs. TC: 296.3±178 U∙L-1; p=0.008) and 3 hr (PL: -87±123 vs. TC: 43.1±105.3 U∙L-1; p=0.006). There was a significant (p=0.003) increase in CKMB concentration in PL when compared to the TC (PL: 21.6±12.4 vs. TC: -0.3±11.8 ng∙ml-1; p=0.006) at 1 hr post. There was a significant increase in handgrip strength in TC when compared to PL (PL: -2±5.1 vs. TC: 1.7±3 kg; p=0.017) at 24 hours post.
Conclusions: This study demonstrated that tart cherry extract reduced oxidative stress and markers of muscle and cardiac damage following intense resistance exercise. This occurred along with a prevention of the decrease in strength seen following the intense exercise protocol. These benefits were seen with minimal energy intake.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5